combine

问题 So I'm digging into combine and this question came up. Is there any real difference between using CurrentValueSubject (and setting its value using currentValueSubject.value ) or using a @Published var and accessing its publisher with a $ ? I mean I know one returns a Subject instead of a Publisher , but the only real difference I could find is that CurrentValueSubject is way more useful because you can declare it on a protocol. I really don't understand how @Published can be useful if we can

问题 I'd like to have a worker task update a SwiftUI view. The worker task is busy doing the procedural work of the application - playing sounds, and firing timer-based events. I'd like to to flash several icons in a SwiftUI view during those timer events. So I want to trigger a view refresh in those icon views. So, I created an environmentObject called Settings. It's instantiated in the App Delegate, and attached to the root view in the SceneDelegate. The Settings object works just fine inside

问题 I have a ObservableObject that I use to update my UI when new data is sent from the server (an a class which contains an array of custom structs). For some reason, when the data is sent, the ContentView 's body is called, but the data isn't changed. I even added a print statement to check if the data that the array contains is right and it is. When I try to switch to another tab on my TabView , and then switch back to the main view, the UI does get updated. Does anybody know why the UI

问题 I have a ObservableObject that I use to update my UI when new data is sent from the server (an a class which contains an array of custom structs). For some reason, when the data is sent, the ContentView 's body is called, but the data isn't changed. I even added a print statement to check if the data that the array contains is right and it is. When I try to switch to another tab on my TabView , and then switch back to the main view, the UI does get updated. Does anybody know why the UI

问题 I have a ObservableObject that I use to update my UI when new data is sent from the server (an a class which contains an array of custom structs). For some reason, when the data is sent, the ContentView 's body is called, but the data isn't changed. I even added a print statement to check if the data that the array contains is right and it is. When I try to switch to another tab on my TabView , and then switch back to the main view, the UI does get updated. Does anybody know why the UI

问题 I have a ObservableObject that I use to update my UI when new data is sent from the server (an a class which contains an array of custom structs). For some reason, when the data is sent, the ContentView 's body is called, but the data isn't changed. I even added a print statement to check if the data that the array contains is right and it is. When I try to switch to another tab on my TabView , and then switch back to the main view, the UI does get updated. Does anybody know why the UI

问题 Scenario: Data stream that contains an item that has changed from an Int to String type causing the JSON parser to crash. Result: Subscriber 'sink' crashed with data type not matching the original receiving type via JSON parser. Goal: to convert the Int values to String to have a consistent stream for a successful parsing. Here's a snippet of the data stream that has caused the crash: ... { "city": "אלון שבות", "sickCount": 124, "actualSick": 15, "verifiedLast7Days": " 11-14 ", "testLast7Days

问题 Thats my model class struct LoginResponse: Codable { let main: LoginModel } struct LoginModel: Codable { let success: Bool? let token: String? let message: String? static var placeholder: LoginModel { return LoginModel(success: nil, token: nil, message: nil) } } Thats my service. I have one more issue i am using two map here but when try to remove map.data getting error in dataTaskPublisher. error mention below Instance method 'decode(type:decoder:)' requires the types 'URLSession

问题 I don't understand why this doesn't compile. It does if I remove the where restriction from the P type. import Combine protocol Foo { associatedtype P: Publisher where P.Output == Int var publisher: P { get } } struct Bar: Foo { var publisher: some Publisher { Just(1) } } The error says that Type 'Bar' does not conform to protocol 'Foo' . I guess it's because publisher return type is not just any some Publisher . But in SwiftUI, the View uses a similar approach, just that it doesn't have

问题 I don't understand why this doesn't compile. It does if I remove the where restriction from the P type. import Combine protocol Foo { associatedtype P: Publisher where P.Output == Int var publisher: P { get } } struct Bar: Foo { var publisher: some Publisher { Just(1) } } The error says that Type 'Bar' does not conform to protocol 'Foo' . I guess it's because publisher return type is not just any some Publisher . But in SwiftUI, the View uses a similar approach, just that it doesn't have