{"id":149509,"date":"2020-08-27T06:54:10","date_gmt":"2020-08-26T22:54:10","guid":{"rendered":"http:\/\/4563.org\/?p=149509"},"modified":"2020-08-27T06:54:10","modified_gmt":"2020-08-26T22:54:10","slug":"%e5%85%b3%e4%ba%8e-swiftui-%e9%87%8c%e9%9d%a2%e4%bd%bf%e7%94%a8-coredata","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=149509","title":{"rendered":"\u5173\u4e8e SwiftUI \u91cc\u9762\u4f7f\u7528 CoreData"},"content":{"rendered":"
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\u5173\u4e8e SwiftUI \u91cc\u9762\u4f7f\u7528 CoreData <\/h1>\n

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\u8cc7\u6df1\u5927\u4f6c : ufo22940268 <\/span> <\/i> 8<\/span> <\/div>\n
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CoreData \u91cc\u9762\u7684 model \u90fd\u662f class\uff0c\u90a3\u4e48\u5f53\u8fd9\u4e9b model \u548c SwiftUI \u4e00\u8d77\u4f7f\u7528\u7684\u65f6\u5019\uff0c\u6bcf\u6b21 property \u66f4\u6539\u7684\u65f6\u5019\u754c\u9762\u5c31\u4e0d\u4f1a\u81ea\u52a8\u5237\u65b0\u4e86\uff0c\u9700\u8981\u624b\u52a8\u8c03\u7528objectWillChange<\/code>\u6765\u624b\u52a8\u5237\u65b0\uff0c\u6bd4\u5982<\/p>\n

                self.api.watchValue = \"newvalue\"                 self.api.objectWillChange.send() <\/code><\/pre>\n
\u6709\u4ec0\u4e48\u597d\u7684\u89e3\u51b3\u65b9\u6848\u5417\uff1f<\/p>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (2<\/span>)        <\/div>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : ufo22940268 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u53d1\u73b0 NSManagedObject \u662f conforms to ObservableObject. \u800c\u4e14\u5c45\u7136\u7528 ObservedObject \u8fdb\u884c\u58f0\u660e\u4e4b\u540e\u80fd\u6b63\u5e38\u5237\u65b0 view\uff0c\u867d\u7136 property \u6ca1\u6709\u7528 @Published \u8fdb\u884c\u4fee\u9970\uff0c\u4e5f\u80fd\u6b63\u5e38 refresh<\/p>\n
    “`
    struct ContentView: View {
     @ObservedObject var entity: MyEntity<\/p>\n
     var body: some View {
     NavigationView {
     VStack {
     Text(“asdfasdf (entity.name!)”)
     Button(“btn”) {
     self.entity.name = “kkkkkkkk”
     }<\/p>\n
     NavigationLink(destination: ContentView(entity: entity)) {
     Text(“jump”)
     }
     }
     }
     }
    }
    “`                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : ufo22940268 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 https:\/\/gist.github.com\/ufo22940268\/220cd201bff4b7e998d440d101cca3f4