{"id":25676,"date":"2025-11-29T04:43:05","date_gmt":"2025-11-29T04:43:05","guid":{"rendered":"https:\/\/pokecon.jp\/job\/?p=25676"},"modified":"2025-11-29T04:43:05","modified_gmt":"2025-11-29T04:43:05","slug":"swift-observation%e3%83%95%e3%83%ac%e3%83%bc%e3%83%a0%e3%83%af%e3%83%bc%e3%82%af%e3%81%ae%e5%88%a9%e7%82%b9%e3%81%a8%e5%8b%95%e4%bd%9c-every-tech-blog","status":"publish","type":"post","link":"https:\/\/pokecon.jp\/job\/25676\/","title":{"rendered":"Swift Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u5229\u70b9\u3068\u52d5\u4f5c &#8211; every Tech Blog"},"content":{"rendered":"\n<\/p>\n<div>\n<p><figure class=\"figure-image figure-image-fotolife\" title=\"\u30bf\u30a4\u30c8\u30eb\u753b\u50cf\"><span itemscope=\"\" itemtype=\"http:\/\/schema.org\/Photograph\"><img decoding=\"async\" src=\"https:\/\/cdn-ak.f.st-hatena.com\/images\/fotolife\/k\/kyoichi-every\/20251128\/20251128120347.jpg\" width=\"1200\" height=\"675\" loading=\"lazy\" title=\"\" class=\"hatena-fotolife\" itemprop=\"image\"\/><\/span><figcaption>\u30bf\u30a4\u30c8\u30eb\u753b\u50cf<\/figcaption><\/figure>\n<\/p>\n<h2 id=\"Swift-Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u5229\u70b9\u3068\u52d5\u4f5c\">Swift Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u5229\u70b9\u3068\u52d5\u4f5c<\/h2>\n<p>\u3053\u306e\u8a18\u4e8b\u306f <a target=\"_blank\" href=\"https:\/\/tech.every.tv\/entry\/2025\/11\/26\/120000\">every Tech Blog Advent Calendar 2025<\/a> \u306e 3\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002<\/p>\n<p>\u3053\u3093\u306b\u3061\u306f\u3001\u30c7\u30ea\u30c3\u30b7\u30e5\u30ad\u30c3\u30c1\u30f3\u3067iOS\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u3057\u3066\u3044\u308b\u8c37\u53e3\u606d\u4e00\u3067\u3059\u3002<\/p>\n<p>\u30c7\u30ea\u30c3\u30b7\u30e5\u30ad\u30c3\u30c1\u30f3\u306eiOS\u3067\u306f\u73fe\u5728\u3001\u72b6\u614b\u306e\u5909\u66f4\u901a\u77e5\u306e\u4ed5\u7d44\u307f\u3068\u3057\u3066\u4e3b\u306bCombine\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u6700\u4f4e\u4e92\u63db\u306eiOS\u30d0\u30fc\u30b8\u30e7\u30f3\u3092iOS16\u3068\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u307e\u3060Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u5c0e\u5165\u306f\u3067\u304d\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u304a\u305d\u3089\u304f\u6765\u5e74\u306b\u306fiOS17+\u306b\u306a\u308b\u3068\u4e88\u60f3\u3055\u308c\u3001SwiftUI\u3067\u306fObservation\u3092\u4f7f\u7528\u3057\u305f\u30e2\u30c0\u30f3\u306a\u72b6\u614b\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3067\u65b0\u898f\u753b\u9762\u306f\u958b\u767a\u3059\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>Apple\u306fObservation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u3001<code>ObservableObject<\/code>\u304b\u3089\u975e\u5e38\u306b\u7c21\u5358\u304b\u3064\u5b89\u5168\u306b\u79fb\u884c\u3067\u304d\u308b\u3088\u3046\u306b\u8a2d\u8a08\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u65e2\u5b58\u753b\u9762\u6539\u4fee\u306a\u3069\u306e\u969b\u306b\u306f\u3001\u5c11\u3057\u305a\u3064Observation\u306b\u79fb\u884c\u3057\u3066\u3044\u304f\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3088\u3063\u3066\u3001Observation\u81ea\u4f53\u306e\u4ed5\u7d44\u307f\u3084\u3001\u4ed6\u306e\u72b6\u614b\u306e\u5909\u66f4\u901a\u77e5\u30b7\u30b9\u30c6\u30e0\u306b\u5bfe\u3059\u308b\u5229\u70b9\u3092\u3042\u308b\u7a0b\u5ea6\u306f\u7406\u89e3\u3059\u308b\u4e8b\u304c\u91cd\u8981\u3067\u3042\u308b\u3068\u8003\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u8abf\u67fb\u3084\u5b66\u7fd2\u3092\u884c\u3044\u3001\u305d\u306e\u30a2\u30a6\u30c8\u30d7\u30c3\u30c8\u3068\u3057\u3066Observation\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304f\u3068\u3044\u3046\u306e\u304c\u3053\u306e\u8a18\u4e8b\u306e\u76ee\u7684\u3067\u3059\u3002<\/p>\n<p>\u307e\u305a\u3001Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3068\u306f\u4f55\u304b\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3001\u65e2\u5b58\u306eCombine\u306e<code>ObservableObject<\/code>\u3092\u7528\u3044\u305f\u65b9\u6cd5\u3068\u306e\u9055\u3044\u3068\u5229\u70b9\u3092\u8aac\u660e\u3057\u3001\u6700\u5f8c\u306bObservation\u81ea\u4f53\u306e\u52d5\u4f5c\u306e\u6982\u8981\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h2 id=\"Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3068\u306f\">Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3068\u306f<\/h2>\n<p>Apple\u306b\u3088\u308b\u3068\u3001Observation\u306f\u4ee5\u4e0b\u306e3\u3064\u306e\u6a5f\u80fd\u3092\u63d0\u4f9b\u3059\u308b\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u3059\u3002<\/p>\n<blockquote>\n<ul>\n<li>Marking a type as observable\uff08<strong>\u578b\u3092\u89b3\u6e2c\u53ef\u80fd\u306b\u3059\u308b<\/strong>\uff09<\/li>\n<li>Tracking changes within an instance of an observable type\uff08<strong>\u89b3\u6e2c\u53ef\u80fd\u306a\u578b\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5185\u306e\u5909\u66f4\u3092\u8ffd\u8de1\u3059\u308b<\/strong>\uff09<\/li>\n<li>Observing and utilizing those changes elsewhere, such as in an app\u2019s user interface\uff08<strong>\u30a2\u30d7\u30ea\u306eUI\u306e\u3088\u3046\u306a\u3069\u306e\u3088\u3046\u306a\u5834\u6240\u304b\u3089\u3082\u3053\u308c\u3089\u306e\u5909\u66f4\u3092\u89b3\u6e2c\u3057\u6d3b\u7528\u3067\u304d\u308b<\/strong>\uff09<\/li>\n<\/ul>\n<p><a target=\"_blank\" href=\"https:\/\/developer.apple.com\/documentation\/Observation\">https:\/\/developer.apple.com\/documentation\/Observation<\/a><\/p>\n<\/blockquote>\n<p>\u3088\u3063\u3066\u3001\u5024\u306e\u5909\u66f4\u3092\u89b3\u6e2c\u53ef\u80fd\u306b\u3059\u308b\u6a5f\u80fd\u3068\u3001\u305d\u308c\u3092\u901a\u77e5\u3059\u308b\u6a5f\u80fd\u3067\u3042\u308b\u3068\u8a00\u3048\u307e\u3059\u3002SwiftUI\u5074\u306fObservation\u306e\u6a5f\u80fd\u3092\u5185\u90e8\u7684\u306b\u5229\u7528\u3057\u3066\u3001\u5024\u306e\u5909\u66f4\u3092UI\u518d\u63cf\u753b\u306b\u6d3b\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057Observation\u306e\u5024\u306e\u5909\u66f4\u306e\u6d3b\u7528\u81ea\u4f53\u306fSwiftUI\u306e\u30b9\u30b3\u30fc\u30d7\u306b\u9650\u3089\u305a\u3001\u3069\u306e\u3088\u3046\u306a\u5834\u6240\u304b\u3089\u3082\u3067\u304d\u308b\u3068\u3044\u3046\u6c4e\u7528\u7684\u306a\u6a5f\u80fd\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<br \/>\n\u3068\u306f\u3044\u3048\u3001\u5927\u90e8\u5206\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u306fSwiftUI\u306eUI\u30b7\u30b9\u30c6\u30e0\u306b\u5bfe\u3059\u308b\u30c7\u30fc\u30bf\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u3060\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306aSwiftUI\u306e\u753b\u9762\u5b9f\u88c5\u3067\u5f79\u306b\u7acb\u3061\u307e\u3059<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\">\n<span class=\"synPreProc\">import<\/span> SwiftUI\n\n<span class=\"synType\">@Observable<\/span>\n<span class=\"synPreProc\">class<\/span> <span class=\"synIdentifier\">Car<\/span> {\n    <span class=\"synPreProc\">var<\/span> <span class=\"synIdentifier\">name<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">String<\/span> <span class=\"synIdentifier\">=<\/span> <span class=\"synConstant\">\"\"<\/span>\n    <span class=\"synPreProc\">var<\/span> <span class=\"synIdentifier\">needsRepairs<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">Bool<\/span> <span class=\"synIdentifier\">=<\/span> <span class=\"synConstant\">false<\/span>\n}\n\n<span class=\"synPreProc\">struct<\/span> <span class=\"synIdentifier\">ContentView<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">View<\/span> {\n    <span class=\"synType\">@State<\/span> <span class=\"synType\">private<\/span> <span class=\"synPreProc\">var<\/span> <span class=\"synIdentifier\">car1<\/span> <span class=\"synIdentifier\">=<\/span> Car()\n\n    <span class=\"synPreProc\">var<\/span> <span class=\"synIdentifier\">body<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">some<\/span> View {\n        VStack(spacing<span class=\"synSpecial\">:<\/span> <span class=\"synConstant\">20<\/span>) {\n            Text(car1.name.isEmpty ? <span class=\"synConstant\">\"No name\"<\/span> <span class=\"synSpecial\">:<\/span> <span class=\"synType\">car1.name<\/span>)\n\n            TextField(<span class=\"synConstant\">\"Name\"<\/span>, text<span class=\"synSpecial\">:<\/span> <span class=\"synIdentifier\">$car1<\/span>.name)\n                .textFieldStyle(.roundedBorder)\n\n            Toggle(<span class=\"synConstant\">\"Needs repairs\"<\/span>, isOn<span class=\"synSpecial\">:<\/span> <span class=\"synIdentifier\">$car1<\/span>.needsRepairs)\n        }\n        .padding()\n    }\n}\n\n#Preview {\n    ContentView()\n}\n<\/pre>\n<p>\u3053\u306e\u5b9f\u88c5\u3067\u306f\u3001\u8eca\u306e\u540d\u524d\u3068\u3001\u4fee\u7406\u304c\u5fc5\u8981\u304b\u3069\u3046\u304b\u3068\u3044\u3046\uff12\u3064\u306e\u5024\u304c\u30e6\u30fc\u30b6\u306e\u30a4\u30f3\u30bf\u30e9\u30af\u30b7\u30e7\u30f3\u306b\u3088\u3063\u3066\u5909\u66f4\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u305d\u308c\u3089\u306e\u5909\u66f4\u3092UI\u4e0a\u306b\u5373\u5ea7\u306b\u53cd\u6620\u3055\u305b\u305f\u3044\u3068\u3044\u3046\u8981\u4ef6\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306a\u3068\u304d\u306b\u3001\u76e3\u8996\u5bfe\u8c61\u306e\u30af\u30e9\u30b9\u306b\u5bfe\u3057\u3066<code>@Observable<\/code>\u30de\u30af\u30ed\u3092\u4ed8\u3051\u308b\u3068\u3001\u305d\u306e\u30af\u30e9\u30b9\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u3092\u305d\u308c\u305e\u308c\u76e3\u8996\/\u901a\u77e5\u3057\u3001SwiftUI\u5074\u304c\u5909\u66f4\u901a\u77e5\u306b\u3088\u3063\u3066\u81ea\u52d5\u3067UI\u66f4\u65b0\u307e\u3067\u3084\u3063\u3066\u304f\u308c\u308b\u3068\u3044\u3046\u306e\u304c\u5927\u307e\u304b\u306a\u6a5f\u80fd\u3067\u3059\u3002\u76e3\u8996\u5bfe\u8c61\u306e\u30af\u30e9\u30b9\u306f<code>Observable<\/code>\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u9069\u5408\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001<code>@State<\/code>\u306fView\u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u7834\u68c4\u305b\u305a\u3001\u3053\u306e\u5024\u304cView\u968e\u5c64\u5185\u3067SSoT\uff08Single Source of Truth\u3001\u4fe1\u983c\u3067\u304d\u308b\u552f\u4e00\u306e\u60c5\u5831\u6e90\uff09\u306a\u5024\u3068\u306a\u308b\u305f\u3081\u306b\u5f15\u304d\u7d9a\u304d\u4ed8\u3051\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u30e9\u30c3\u30d1\u30fc\u306f\u3001\u5024\u306e\u76e3\u8996\u3084Observation\u306e\u6a5f\u80fd\u3068\u306f\u5168\u304f\u7570\u306a\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u3001<code>Observable<\/code>\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u3001<code>@Observable<\/code>\u30de\u30af\u30ed\u3068\u3044\u3046\u6982\u5ff5\u304c\u767b\u5834\u3057\u307e\u3057\u305f<\/p>\n<p>Apple\u306b\u3088\u308b\u3068\u3001<code>Observable<\/code>\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3059\u3002<\/p>\n<blockquote>\n<p>A type that emits notifications to observers when underlying data changes.<br \/>\n\u5185\u5728\u3059\u308b\u30c7\u30fc\u30bf\u304c\u5909\u66f4\u3055\u308c\u305f\u3068\u304d\u306b\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u306b\u901a\u77e5\u3092\u9001\u4fe1\u3059\u308b\u578b<br \/>\n<a target=\"_blank\" href=\"https:\/\/developer.apple.com\/documentation\/observation\/observable\">https:\/\/developer.apple.com\/documentation\/observation\/observable<\/a><\/p>\n<\/blockquote>\n<p>\u5185\u5728\u3059\u308b\u30c7\u30fc\u30bf\u3068\u306f\u3001\u3053\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u6e96\u62e0\u3057\u305f\u578b\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u3053\u3068\u3060\u3068\u601d\u308f\u308c\u307e\u3059\u3002\u3053\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306f\u5358\u306b\u305d\u308c\u304c\u76e3\u8996\u304c\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u8868\u3059\u3060\u3051\u3067\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059<\/p>\n<p>\u6b21\u306b\u3001<code>@Observable<\/code>\u30de\u30af\u30ed\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u8aac\u660e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<blockquote>\n<p>Defines and implements conformance of the Observable protocol.<br \/>\nObservable \u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u6e96\u62e0\u3092\u5b9a\u7fa9\u304a\u3088\u3073\u5b9f\u88c5\u3057\u307e\u3059\u3002<br \/>\n<a target=\"_blank\" href=\"https:\/\/developer.apple.com\/documentation\/observation\/observable()\">https:\/\/developer.apple.com\/documentation\/observation\/observable()<\/a><\/p>\n<\/blockquote>\n<p>\u3088\u3063\u3066\u3053\u306e\u30de\u30af\u30ed\u3067\u306f\u3001\uff12\u3064\u306e\u3053\u3068\u3092\u884c\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059<\/p>\n<ul>\n<li>\u30de\u30af\u30ed\u3092\u4ed8\u3051\u305f\u578b\u3092<code>Observable<\/code>\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u6e96\u62e0\u3055\u305b\u308b<\/li>\n<li>\u30de\u30af\u30ed\u3092\u4ed8\u3051\u305f\u578b\u306b\u5bfe\u3057\u3066\u3001<code>Observable<\/code>\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u6e96\u62e0\u306e\u305f\u3081\u306e\u5b9f\u88c5\u3092\u3059\u308b<\/li>\n<\/ul>\n<p>\u3053\u3053\u3067\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306f\u3001\u6982\u5ff5\u3084\u578b\u3092\u62bd\u8c61\u5316\u3001\u5171\u901a\u5316\u3059\u308b\u3088\u3046\u306a\u76ee\u7684\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u4f7f\u3044\u65b9\u3068\u306f\u82e5\u5e72\u7570\u306a\u308b\u3088\u3046\u306a\u6c17\u304c\u3057\u307e\u3057\u305f\u3002\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u7279\u5b9a\u306e\u5236\u7d04\u306e\u660e\u793a\u306b\u4f7f\u3063\u3066\u3044\u3066\u3001\u305d\u306e\u5b9f\u88c5\u306a\u3069\u306f\u30de\u30af\u30ed\u306e\u30b3\u30fc\u30c9\u8ffd\u52a0\u304c\u62c5\u3046\u3068\u3044\u3046\u30b3\u30f3\u30bb\u30d7\u30c8\u306e\u3088\u3046\u3067\u3059\u3002<\/p>\n<p>Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u304c\u63d0\u4f9b\u3059\u308b\u6a5f\u80fd\u3068\u3057\u3066\u306f\u3053\u308c\u3067\u307b\u307c\u3059\u3079\u3066\u306b\u306a\u308a\u307e\u3059\u3002\u975e\u5e38\u306b\u30b7\u30f3\u30d7\u30eb\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>SwiftUI\u5074\u306f\u3001<code>Observable<\/code>\u306b\u9069\u5408\u3057\u305f\u578b\u306b\u5bfe\u3057\u3066UI\u66f4\u65b0\u306a\u3069\u306e\u7279\u5225\u306a\u64cd\u4f5c\u3092\u5185\u90e8\u7684\u306b\u4ed5\u8fbc\u3093\u3067\u304a\u304f\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u305d\u306e\u5909\u66f4\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u3044\u3046\u4ed5\u7d44\u307f\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2 id=\"ObservableObject\u3068\u306e\u9055\u3044\u306b\u3064\u3044\u3066\">ObservableObject\u3068\u306e\u9055\u3044\u306b\u3064\u3044\u3066<\/h2>\n<p>\u73fe\u5728\u3067\u3082SwiftUI\u3067\u306e\u72b6\u614b\u7ba1\u7406\u306b\u306fCombine\u306e<code>ObservableObject<\/code>\u30d7\u30ed\u30c8\u30b3\u30eb\u3068<code>@StateObject<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u30e9\u30c3\u30d1\u30fc\u304c\u3088\u304f\u4f7f\u308f\u308c\u3066\u3044\u3066\u3001Observation\u306b\u3088\u308b\u5b9f\u88c5\u306f\u3053\u3061\u3089\u3068\u307b\u307c\u540c\u7b49\u306a\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u3066\u3044\u308b\u3068\u601d\u3044\u307e\u3059\u3002<br \/>\n\u3067\u306f\u306a\u305cObservation\u304c\u5fc5\u8981\u306a\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u307e\u305f\u3001<code>ObservableObject<\/code>\u306b\u5bfe\u3057\u3066\u3001Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306f\u3069\u306e\u3088\u3046\u306a\u5229\u70b9\u304c\u3042\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u79c1\u306f\u3001\u4e3b\u306b\u4ee5\u4e0b\u306e\uff14\u3064\u3042\u308b\u3068\u8003\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u76e3\u8996\u3057\u305f\u3044\u578b\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u305d\u308c\u305e\u308c\u306b\u5bfe\u3057\u3066\u76e3\u8996\u304c\u884c\u3048\u308b<\/li>\n<li>\u30cd\u30b9\u30c8\u3057\u305f\u578b\u306e\u5b50\u8981\u7d20\u3082\u76e3\u8996\u3067\u304d\u308b<\/li>\n<li>SwiftUI\u306eView\u968e\u5c64\u3067\u3001\u76e3\u8996\u3057\u305f\u3044\u5024\u3092\u4f1d\u64ad\u3055\u305b\u308b\u5fc5\u8981\u304c\u306a\u3044<\/li>\n<li>\u76e3\u8996\u5bfe\u8c61\u306e\u5404\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u5bfe\u3057\u3066\u3001\u76e3\u8996\u3059\u308b\u3053\u3068\u3092\u660e\u793a\u3059\u308b\u5fc5\u8981\u304c\u306a\u3044<\/li>\n<\/ul>\n<p>\u307e\u305a\uff11\u3064\u76ee\u304c\u3001\u76e3\u8996\u3057\u305f\u3044\u578b\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u305d\u308c\u305e\u308c\u306b\u5bfe\u3057\u3066\u76e3\u8996\u304c\u884c\u3048\u308b\u3068\u3044\u3046\u70b9\u3067\u3059\u3002<\/p>\n<p><code>ObservableObject<\/code>\u306e\u5834\u5408\u3001\u3053\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u9069\u5408\u3057\u305f\u30af\u30e9\u30b9\u306e<code>@Published<\/code>\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5909\u66f4\u306b\u3088\u3063\u3066\u3001\u305d\u306e\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308bUI\u8981\u7d20\u3059\u3079\u3066\u304c\u518d\u63cf\u753b\u3055\u308c\u3066\u3057\u307e\u3046\u3068\u3044\u3046\u554f\u984c\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u76e3\u8996\u5bfe\u8c61\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u305f\u304f\u3055\u3093\u3042\u308b\u5834\u5408\u3001\u305d\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u95a2\u4fc2\u304c\u3042\u308bUI\u8981\u7d20\u306e\u307f\u3092\u518d\u63cf\u753b\u3059\u308b\u307b\u3046\u304c\u7406\u306b\u304b\u306a\u3063\u3066\u3044\u307e\u3059\u3002Observation\u306f\u3053\u306e\u3088\u3046\u306a\u8981\u4ef6\u3092\u6e80\u305f\u3059\u3053\u3068\u304c\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306b\u3001\u76e3\u8996\u5bfe\u8c61\u306e\u578b\u306e\u30cd\u30b9\u30c8\u306b\u3064\u3044\u3066\u3067\u3059\u3002<\/p>\n<p><code>ObservableObject<\/code>\u306b\u9069\u5408\u3057\u305f\u30af\u30e9\u30b9\u306e<code>@Published<\/code>\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u3092<code>ObservableObject<\/code>\u306b\u6e96\u62e0\u3055\u305b\u3066\u76e3\u8996\u3057\u3088\u3046\u3068\u3057\u3066\u3082\u3001\u30cd\u30b9\u30c8\u3055\u308c\u305f\u5b50\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5909\u66f4\u306f\u81ea\u52d5\u3067\u306f\u901a\u77e5\u3055\u308c\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u5358\u7d14\u306a\u7406\u7531\u3067\u3001\u72b6\u614b\u306e\u5909\u66f4\u901a\u77e5\u306fView\u5074\u3067<code>ObservableObject<\/code>\u30d7\u30ed\u30c8\u30b3\u30eb\u306e<code>objectWillChange()<\/code>\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u3063\u3066\u884c\u308f\u308c\u308b\u305f\u3081\u3001\u30cd\u30b9\u30c8\u3057\u305f\u5b50\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e<code>objectWillChange()<\/code>\u306f\u547c\u3070\u308c\u306a\u3044\u304b\u3089\u901a\u77e5\u3055\u308c\u306a\u3044\u3068\u3044\u3046\u8a33\u3067\u3059\u3002<br \/>\n\u3088\u3063\u3066\u3001\u5b50\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e<code>objectWillChange()<\/code>\u304c\u547c\u3070\u308c\u308b\u3068\u3001\u89aa\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e<code>objectWillChange()<\/code>\u3092\u9023\u9396\u7684\u306b\u547c\u3076\u3088\u3046\u306a\u5b9f\u88c5\u3092\u660e\u793a\u7684\u306b\u3059\u308c\u3070\u3053\u306e\u554f\u984c\u306f\u89e3\u6c7a\u3067\u304d\u307e\u3059\u304c\u3001\u30af\u30ea\u30fc\u30f3\u306a\u65b9\u6cd5\u3068\u306f\u8a00\u3048\u306a\u305d\u3046\u3067\u3059\u3002<br \/>\nObservation\u3067\u306f\u3001\u5358\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u5024\u3092\u81ea\u52d5\u7684\u306b\u76e3\u8996\u3059\u308b\u3068\u3044\u3046\u30b3\u30f3\u30bb\u30d7\u30c8\u306e\u305f\u3081\u3001\u305d\u306e\u5024\u3092\u4fdd\u6301\u3059\u308b\u30c7\u30fc\u30bf\u69cb\u9020\u306b\u4f9d\u5b58\u3057\u307e\u305b\u3093\u3002\u3088\u3063\u3066\u3001\u30cd\u30b9\u30c8\u3055\u308c\u3066\u3044\u3066\u3082\u554f\u984c\u306a\u304f\u5909\u66f4\u901a\u77e5\u3092\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>3\u3064\u3081\u306bSwiftUI\u4e0a\u3067\u306e\u5024\u306e\u4f1d\u64ad\u306b\u3064\u3044\u3066\u3067\u3059\u3002<br \/>\nSwiftUI\u3067\u306f\u3001<code>@StateObject<\/code>\u3084<code>@State<\/code>\u3067\u5b9a\u7fa9\u3057\u305fView\u306e\u30b9\u30b3\u30fc\u30d7\u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u306b\u304a\u3044\u3066\u3001\u3053\u306e\u5024\u306e\u76e3\u8996\u3068UI\u66f4\u65b0\u3092\u884c\u3044\u307e\u3059\u3002\u3088\u3063\u3066\u3001\u5b50View\u3067\u306e\u5024\u306e\u5909\u66f4\u306b\u306f\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u305b\u3093\u3002\u3088\u3063\u3066\u3001<code>@Binding<\/code>\u3068\u3044\u3046\u30d7\u30ed\u30d1\u30c6\u30a3\u30e9\u30c3\u30d1\u30fc\u3092\u4f7f\u7528\u3057\u3066\u3001\u5b50View\u3068\u5024\u3092\u5171\u6709\u3059\u308b\u3068\u3044\u3046\u4ed5\u7d44\u307f\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002\u3088\u3063\u3066\u3001\u672b\u7aef\u306e\u5b50View\u3067\u5024\u304c\u5909\u66f4\u3055\u308c\u308b\u3068\u3001\u305d\u306e\u5b50View\u3092\u542b\u3080View\u968e\u5c64\u5168\u4f53\u3092\u66f4\u65b0\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u306e\u4f1d\u64ad\u304c\u4ed5\u7d44\u307f\u3068\u3057\u3066\u8907\u96d1\u3067\u3042\u308b\u3068\u3044\u3046\u70b9\u3068\u30011\u3064\u76ee\u306e\u554f\u984c\u3068\u540c\u69d8\u306b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u7684\u306a\u554f\u984c\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u306f\u3001\u5909\u66f4\u5bfe\u8c61\u306e\u5024\u3092\u6301\u3064\u5404View\u305d\u308c\u305e\u308c\u304c\u5024\u3092\u76e3\u8996\u3059\u308b\u3068\u3044\u3046\u30b7\u30f3\u30d7\u30eb\u306a\u4ed5\u7d44\u307f\u306e\u305f\u3081\u3001\u5024\u306e\u4f1d\u64ad\u306e\u305f\u3081\u306e\u8907\u96d1\u306a\u6a5f\u80fd\u3092\u5fc5\u8981\u3068\u3057\u307e\u305b\u3093\u3002<\/p>\n<p>\u6700\u5f8c\u306b\u3001<code>ObservableObject<\/code>\u306e\u5b9f\u88c5\u3067\u306f\u3001\u76e3\u8996\u5bfe\u8c61\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b<code>@Published<\/code>\u3068\u3044\u3046\u30d7\u30ed\u30d1\u30c6\u30a3\u30e9\u30c3\u30d1\u30fc\u3092\u4ed8\u4e0e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3068\u3044\u3046\u70b9\u3067\u3059\u3002SwiftUI\u3067\u4f7f\u3046\u30af\u30e9\u30b9\u5185\u306e\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u306a\u5024\u306f\u3001\u57fa\u672c\u7684\u306b\u76e3\u8996\u3057\u305f\u3044\u3068\u3044\u3046\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u306a\u306f\u305a\u3067\u3059\u3002\u3088\u3063\u3066\u3001\u76e3\u8996\u3059\u308b\u3068\u3044\u3046\u72b6\u6cc1\u3092\u30c7\u30d5\u30a9\u30eb\u30c8\u306b\u3057\u3066\u3001\u76e3\u8996\u3057\u305f\u304f\u306a\u3044\u3068\u304d\u306b\u305d\u308c\u3092\u660e\u793a\u3059\u308b\u307b\u3046\u304c\u81ea\u7136\u3067\u3042\u308b\u3068\u3044\u3046\u8003\u3048\u65b9\u3082\u3067\u304d\u308b\u3068\u601d\u3044\u307e\u3059\u3002Observation\u306f\u3053\u306e\u3088\u3046\u306a\u65b9\u6cd5\u3092\u53d6\u308b\u305f\u3081\u3001\u3088\u308a\u30b9\u30c3\u30ad\u30ea\u3068\u3057\u305f\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u66f8\u304d\u5fc3\u5730\u306e\u554f\u984c\u306a\u306e\u3067\u3001\u3053\u308c\u307e\u3067\u306e\u3082\u306e\u3088\u308a\u4e9b\u7d30\u306a\u554f\u984c\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<h2 id=\"Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u52d5\u4f5c\u306e\u6982\u8981\">Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u52d5\u4f5c\u306e\u6982\u8981<\/h2>\n<p>\u305d\u308c\u3067\u306fObservation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u304c\u63d0\u4f9b\u3059\u308b<code>Observable<\/code>\u30de\u30af\u30ed\u306f\u3069\u306e\u3088\u3046\u306a\u5b9f\u88c5\u3092\u3057\u3066\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1fSwift\u306e\u30de\u30af\u30ed\u306f\u5c55\u958b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u305f\u3081\u3001\u5b9f\u88c5\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5b9f\u88c5\u3092\u898b\u308c\u3070\u5927\u4f53\u4f55\u3092\u3057\u3066\u3044\u305d\u3046\u304b\u304c\u63a8\u6e2c\u3067\u304d\u308b\u3068\u601d\u3044\u307e\u3059\u3002Xcode\u4e0a\u3067\u306f\u30de\u30af\u30ed\u3092\u8868\u3059\u90e8\u5206\uff08<code>@Observable<\/code>\uff09\u3092\u53f3\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001Expand Macros\u3068\u3044\u3046\u9078\u629e\u80a2\u304c\u51fa\u3066\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synType\">@Observable<\/span>\n<span class=\"synPreProc\">class<\/span> <span class=\"synIdentifier\">Car<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">Observable<\/span> {\n    <span class=\"synPreProc\">var<\/span> <span class=\"synIdentifier\">name<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">String<\/span> <span class=\"synIdentifier\">=<\/span> <span class=\"synConstant\">\"\"<\/span>\n    <span class=\"synPreProc\">var<\/span> <span class=\"synIdentifier\">needsRepairs<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">Bool<\/span> <span class=\"synIdentifier\">=<\/span> <span class=\"synConstant\">false<\/span>\n}\n<\/pre>\n<p>\u3053\u306e\u4f8b\u306e\u3088\u3046\u306a\u30af\u30e9\u30b9\u306e\u30de\u30af\u30ed\u3092Xcode\u3092\u4f7f\u3063\u3066\u5c55\u958b\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synType\">@Observable<\/span> <span class=\"synPreProc\">class<\/span> <span class=\"synIdentifier\">Car<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">Observable<\/span> {\n    <span class=\"synType\">@ObservationTracked<\/span> \n    <span class=\"synType\">var<\/span> name<span class=\"synSpecial\">:<\/span> <span class=\"synType\">String<\/span> <span class=\"synIdentifier\">=<\/span> <span class=\"synConstant\">\"\"<\/span>\n    {\n        <span class=\"synType\">@storageRestrictions<\/span><span class=\"synSpecial\">(<\/span><span class=\"synType\">initializes: _name<\/span><span class=\"synSpecial\">)<\/span>\n        <span class=\"synIdentifier\">init<\/span>(initialValue) {\n            _name <span class=\"synIdentifier\">=<\/span> initialValue\n        }\n        <span class=\"synStatement\">get<\/span> {\n            access(keyPath<span class=\"synSpecial\">:<\/span> \\.name)\n            <span class=\"synStatement\">return<\/span> _name\n        }\n        <span class=\"synStatement\">set<\/span> {\n            withMutation (keyPath<span class=\"synSpecial\">:<\/span> \\.name) {\n                _name <span class=\"synIdentifier\">=<\/span> newValue\n            }\n        }\n        _modify {\n            access(keyPath<span class=\"synSpecial\">:<\/span> \\.name)\n            _<span class=\"synIdentifier\">$observationRegistrar<\/span>.<span class=\"synStatement\">willSet<\/span>(<span class=\"synIdentifier\">self<\/span>, keyPath<span class=\"synSpecial\">:<\/span> \\.name)\n            <span class=\"synStatement\">defer<\/span> {\n                _<span class=\"synIdentifier\">$observationRegistrar<\/span>.<span class=\"synStatement\">didSet<\/span>(<span class=\"synIdentifier\">self<\/span>, keyPath<span class=\"synSpecial\">:<\/span> \\.name)\n            }\n            yield <span class=\"synIdentifier\">&amp;<\/span>_name\n        }\n    }\n\n    <span class=\"synType\">@ObservationIgnored<\/span> <span class=\"synType\">private<\/span> <span class=\"synPreProc\">var<\/span> <span class=\"synIdentifier\">_name<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">String<\/span> <span class=\"synIdentifier\">=<\/span> <span class=\"synConstant\">\"\"<\/span>\n\n    <span class=\"synType\">@ObservationTracked<\/span>\n    <span class=\"synType\">var<\/span> needsRepairs<span class=\"synSpecial\">:<\/span> <span class=\"synType\">Bool<\/span> <span class=\"synIdentifier\">=<\/span> <span class=\"synConstant\">false<\/span>\n    {\n        <span class=\"synType\">@storageRestrictions<\/span><span class=\"synSpecial\">(<\/span><span class=\"synType\">initializes: _needsRepairs<\/span><span class=\"synSpecial\">)<\/span>\n        <span class=\"synIdentifier\">init<\/span>(initialValue) {\n            _needsRepairs <span class=\"synIdentifier\">=<\/span> initialValue\n        }\n        <span class=\"synStatement\">get<\/span> {\n            access (keyPath<span class=\"synSpecial\">:<\/span> \\.needsRepairs)\n            <span class=\"synStatement\">return<\/span> _needsRepairs\n        }\n        <span class=\"synStatement\">set<\/span> {\n            withMutation (keyPath<span class=\"synSpecial\">:<\/span> \\. needsRepairs) {\n                _needsRepairs <span class=\"synIdentifier\">=<\/span> newValue\n            }\n        }\n        _modify {\n            access (keyPath<span class=\"synSpecial\">:<\/span> \\.needsRepairs)\n            _<span class=\"synIdentifier\">$observationRegistrar<\/span> <span class=\"synStatement\">willSet<\/span>(<span class=\"synIdentifier\">self<\/span>, keyPath<span class=\"synSpecial\">:<\/span> \\.needsRepairs)\n            <span class=\"synStatement\">defer<\/span> {\n                _<span class=\"synIdentifier\">$observationRegistrar<\/span> <span class=\"synStatement\">didSet<\/span>(<span class=\"synIdentifier\">self<\/span>, keyPath<span class=\"synSpecial\">:<\/span> \\.needsRepairs)\n            }\n            yield <span class=\"synIdentifier\">&amp;<\/span>_needsRepairs\n        }\n    }\n\n    <span class=\"synType\">@ObservationIgnored<\/span> <span class=\"synType\">private<\/span> <span class=\"synPreProc\">var<\/span> <span class=\"synIdentifier\">_needsRepairs<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">Bool<\/span> <span class=\"synIdentifier\">=<\/span> <span class=\"synConstant\">false<\/span>\n\n    <span class=\"synType\">@ObservationIgnored<\/span> <span class=\"synType\">private<\/span> <span class=\"synPreProc\">let<\/span> <span class=\"synIdentifier\">_$observationRegistrar<\/span> <span class=\"synIdentifier\">=<\/span> Observation.ObservationRegistrar()\n\n    <span class=\"synStatement\">internal<\/span> nonisolated <span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">access<\/span><span class=\"synSpecial\">&lt;<\/span><span class=\"synIdentifier\">Member<\/span><span class=\"synSpecial\">&gt;<\/span> ( keyPath<span class=\"synSpecial\">:<\/span> <span class=\"synType\">KeyPath<\/span><span class=\"synSpecial\">&lt;<\/span><span class=\"synIdentifier\">Car<\/span><span class=\"synSpecial\">, <\/span><span class=\"synIdentifier\">Member<\/span><span class=\"synSpecial\">&gt;<\/span> {\n        _<span class=\"synIdentifier\">$observationRegistrar<\/span>.access(<span class=\"synIdentifier\">self<\/span>, keyPath<span class=\"synSpecial\">:<\/span> <span class=\"synType\">keyPath<\/span>)\n    }\n\n    <span class=\"synStatement\">internal<\/span> nonisolated <span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">withMutation<\/span><span class=\"synSpecial\">&lt;<\/span><span class=\"synIdentifier\">Member<\/span><span class=\"synSpecial\">, <\/span><span class=\"synIdentifier\">MutationResult<\/span><span class=\"synSpecial\">&gt;<\/span>(\n        keyPath<span class=\"synSpecial\">:<\/span> <span class=\"synType\">KeyPath<\/span><span class=\"synSpecial\">&lt;<\/span><span class=\"synIdentifier\">Car<\/span><span class=\"synSpecial\">, <\/span><span class=\"synIdentifier\">Member<\/span><span class=\"synSpecial\">&gt;<\/span>, \n        _ mutation<span class=\"synSpecial\">: ()<\/span> <span class=\"synStatement\">throws<\/span> <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">MutationResult<\/span>\n    ) <span class=\"synStatement\">rethrows<\/span> <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">MutationResult<\/span> {\n        <span class=\"synStatement\">try<\/span> _<span class=\"synIdentifier\">$observationRegistrar<\/span>.withMutation(of<span class=\"synSpecial\">:<\/span> <span class=\"synType\">self<\/span>, keyPath<span class=\"synSpecial\">:<\/span> <span class=\"synType\">keyPath<\/span>, mutation)\n    }\n}\n<\/pre>\n<p>\u307e\u305a\u3001Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u767b\u5834\u4eba\u7269\u306f\u4ee5\u4e0b\u306b\u306a\u308a\u307e\u3059<\/p>\n<ul>\n<li><strong>ObservationRegistrar<\/strong>: \u3069\u3053\u3067\u3069\u306e<code>@ObservationTracked<\/code>\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u898b\u3066\u3044\u308b\u304b\u3092\u4fdd\u6301\u3059\u308b\u767b\u9332\u7c3f\u306e\u3088\u3046\u306a\u3082\u306e\u3092\u7ba1\u7406\u3059\u308b\u8cac\u52d9\u3092\u6301\u3064<\/li>\n<li><strong>access(keyPath:)<\/strong>: \u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u8aad\u307e\u308c\u305f\u3053\u3068\u3092\u30ec\u30b8\u30b9\u30c8\u30e9\u306b\u4f1d\u3048\u308b<\/li>\n<li><strong>withMutation(keyPath:, mutation: )<\/strong>: \u5024\u306e\u5909\u66f4\u3092\u76e3\u8996\u8005\u5168\u4f53\u306b\u4f1d\u3048\u308b<\/li>\n<\/ul>\n<p><code>@Observable<\/code>\u30de\u30af\u30ed\u3092\u4ed8\u3051\u308b\u3068\u3001\u5b9a\u7fa9\u3057\u305f\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u3059\u3079\u3066\u8a08\u7b97\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u306a\u308a\u307e\u3059\u3002Swift\u306eAttached Macro\u306f\u30b3\u30fc\u30c9\u306e\u5909\u66f4\u3084\u524a\u9664\u306f\u3067\u304d\u305a\u3001\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3057\u304b\u3067\u304d\u306a\u3044\u3068\u3044\u3046\u5236\u7d04\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u30b3\u30fc\u30c9\u306e\u5b89\u5168\u6027\u3092\u4fdd\u3064\u305f\u3081\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u5143\u306e\u5909\u6570\u3092<code>_name<\/code>\u306e\u3088\u3046\u306b\u5225\u306e\u5909\u6570\u306b\u3088\u3051\u3066\u3001\u672c\u6765\u306e\u5909\u6570\u3092\u8a08\u7b97\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u3059\u308b\u3068\u8a00\u3046\u65b9\u6cd5\u306fAttached Macro\u306e\u30b3\u30f3\u30bb\u30d7\u30c8\u306e\u5272\u306b\u306f\u7d50\u69cb\u6280\u5de7\u7684\u3060\u306a\u3068\u500b\u4eba\u7684\u306b\u306f\u601d\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u5b9a\u7fa9\u3057\u305f\u30d7\u30ed\u30d1\u30c6\u30a3\u306e<code>get<\/code>\u3084<code>set<\/code>\u3067\u7279\u5b9a\u306e\u51e6\u7406\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3059\u308b\u90e8\u5206\u306e\u672c\u8cea\u306f\u3053\u3053\u3060\u3068\u601d\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u3053\u3067\u3057\u305f\u3044\u51e6\u7406\u306e\u6b86\u3069\u306f<code>ObservationRegistrar<\/code>\u3068\u3044\u3046\u5024\u306e\u76e3\u8996\/\u901a\u77e5\u3092\u53f8\u308b\u69cb\u9020\u4f53\u7d4c\u7531\u3067\u884c\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<code>ObservationRegistrar<\/code>\u306e<code>access<\/code>\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u76e3\u8996\u5bfe\u8c61\u306e\u767b\u9332\u3001<code>withMutation<\/code>\u3067\u306f\u5909\u66f4\u306e\u5168\u4f53\u901a\u77e5\u306e\u3088\u3046\u306a\u5f79\u5272\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001<code>ObservationRegistrar<\/code>\u306e\u5b9a\u7fa9\u306e\u672b\u5c3e\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b0\u30ed\u30fc\u30d0\u30eb\u95a2\u6570\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synStatement\">public<\/span> <span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">withObservationTracking<\/span><span class=\"synSpecial\">&lt;<\/span><span class=\"synIdentifier\">T<\/span><span class=\"synSpecial\">&gt;<\/span>(\n    _ apply<span class=\"synSpecial\">: ()<\/span> <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">T<\/span>, \n    onChange<span class=\"synSpecial\">:<\/span> <span class=\"synType\">@autoclosure<\/span><span class=\"synSpecial\"> ()<\/span> <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">@Sendable<\/span><span class=\"synSpecial\"> ()<\/span> <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">Void<\/span>\n    ) <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">T<\/span>\n<\/pre>\n<p>\u3053\u306e\u95a2\u6570\u306f\u3001<code>apply<\/code>\u5185\u3067\u30ec\u30b8\u30b9\u30c8\u30e9\u306b\u767b\u9332\u3055\u308c\u305f\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5909\u66f4\u3092\u691c\u51fa\u3059\u308b\u3068\u3001<code>onChange<\/code>\u5185\u306e\u30af\u30ed\u30fc\u30b8\u30e3\u304c\u5b9f\u884c\u3055\u308c\u308b\u3068\u3044\u3046\u30b7\u30f3\u30d7\u30eb\u306a\u95a2\u6570\u3067\u3059\u3002<\/p>\n<p>Apple\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u4f8b\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">render<\/span>() {\n    withObservationTracking {\n        <span class=\"synStatement\">for<\/span> car <span class=\"synStatement\">in<\/span> cars {\n            print(car.name)\n        }\n    } onChange<span class=\"synSpecial\">:<\/span> {\n        print(<span class=\"synConstant\">\"Schedule renderer.\"<\/span>)\n    }\n}\n<\/pre>\n<p>\u4e00\u898b\u3059\u308b\u3068\u3053\u306e\u95a2\u6570\u306f\u4e0d\u601d\u8b70\u306b\u601d\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u306a\u305c\u306a\u3089\u3001<code>apply<\/code>\u5185\u3067\u306f\u5358\u306b<code>print<\/code>\u6587\u3092\u547c\u3093\u3067\u3044\u308b\u3060\u3051\u3067\u3001\u610f\u5473\u306e\u306a\u3044\u30b3\u30fc\u30c9\u306b\u898b\u3048\u308b\u304b\u3089\u3067\u3059\u3002\u3057\u304b\u3057\u3001<code>Observable<\/code>\u30de\u30af\u30ed\u306e\u4ed5\u7d44\u307f\u3092\u898b\u308b\u3068\u308f\u304b\u308b\u3088\u3046\u306b\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u306e<code>get<\/code>\u3067<code>access<\/code>\u304c\u547c\u3070\u308c\u306a\u3044\u3068\u3001\u76e3\u8996\u5bfe\u8c61\u306b\u8ffd\u52a0\u3055\u308c\u306a\u3044\u3068\u3044\u3046\u8a2d\u8a08\u306e\u305f\u3081\u3001\u3053\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\uff11\u5ea6\u3067\u3082\u53c2\u7167\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>SwiftUI\u306eView\u306ebody\u3067\u306f\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306bUI\u518d\u63cf\u753b\u306e\u5fc5\u8981\u304c\u3042\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6e21\u3057\u3066\u76e3\u8996\u3059\u308b\u6a5f\u80fd\u304c\u5185\u90e8\u3067\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3042\u308d\u3046\u3068\u3044\u3046\u3053\u3068\u304c\u63a8\u6e2c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u5fc5\u8981\u306aView\u306e\u30b9\u30b3\u30fc\u30d7\u3067\u5fc5\u8981\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u3060\u3051\u3092\u76e3\u8996\u3057\u3066\u90e8\u5206\u7684\u306b\u518d\u63cf\u753b\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u3063\u3066\u3044\u308b\u6280\u8853\u7684\u306a\u7406\u7531\u304c\u308f\u304b\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<h2 id=\"\u307e\u3068\u3081\">\u307e\u3068\u3081<\/h2>\n<ul>\n<li>Observation\u306f\u4ee5\u4e0b\u306e\u6a5f\u80fd\u3092\u63d0\u4f9b\u3059\u308b\u30b7\u30f3\u30d7\u30eb\u306a\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u3042\u308b\n<ul>\n<li><strong>\u578b\u3092\u89b3\u6e2c\u53ef\u80fd\u306b\u3059\u308b<\/strong><\/li>\n<li><strong>\u89b3\u6e2c\u53ef\u80fd\u306a\u578b\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5185\u306e\u5909\u66f4\u3092\u8ffd\u8de1\u3059\u308b<\/strong><\/li>\n<li><strong>\u30a2\u30d7\u30ea\u306eUI\u306e\u3088\u3046\u306a\u3001\u3069\u306e\u3088\u3046\u306a\u5834\u6240\u304b\u3089\u3082\u3053\u308c\u3089\u306e\u5909\u66f4\u3092\u89b3\u6e2c\u3057\u6d3b\u7528\u3067\u304d\u308b<\/strong><\/li>\n<\/ul>\n<\/li>\n<li>SwiftUI\u3067\u306e\u72b6\u614b\u7ba1\u7406\u3067\u306f\u3001Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306fCombine\u306e<code>ObservableObject<\/code>\u306b\u5bfe\u3057\u3066\u3044\u304f\u3064\u304b\u306e\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308b<\/li>\n<li>Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306f\u3001\u5024\u306e\u76e3\u8996\u6a5f\u80fd\u3092\u30de\u30af\u30ed\u3092\u4f7f\u3063\u3066\u5b9f\u88c5\u3055\u308c\u3066\u3044\u3066\u3001<code>ObservationRegistrar<\/code>\u7d4c\u7531\u3067\u76e3\u8996\u3068\u901a\u77e5\u304c\u884c\u308f\u308c\u3066\u3044\u308b<\/li>\n<\/ul>\n<p>SwiftUI\u306b\u304a\u3044\u3066Observation\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u4f7f\u7528\u3057\u305f\u30b7\u30f3\u30d7\u30eb\u306a\u72b6\u614b\u7ba1\u7406\u306fiOS\u30a2\u30d7\u30ea\u958b\u767a\u306b\u304a\u3051\u308b\u30c7\u30d5\u30a1\u30af\u30c8\u30b9\u30bf\u30f3\u30c0\u30fc\u30c9\u306b\u306a\u308b\u3068\u79c1\u306f\u601d\u3044\u307e\u3059\u3002\u3082\u3061\u308d\u3093Combine\u306a\u3069\u3092\u4f7f\u7528\u3059\u308b\u3079\u304d\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3082\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002\u30c7\u30ea\u30c3\u30b7\u30e5\u30ad\u30c3\u30c1\u30f3\u306e\u6700\u4f4e\u4e92\u63db\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u4e0a\u304c\u3063\u305f\u3089\u3001\u5b9f\u969b\u306b\u79fb\u884c\u3057\u3066\u307f\u3066\u8a66\u3057\u3066\u307f\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n<p><script>(function(d, 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