Created
April 10, 2023 08:25
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Provides a task modifier with an optional binding that will run the task if the binding is set to a non-nil value and reset it to nil once the task is done. The purpose of this is to bind a one-shot task to the view, i.e. the cancellation is automatically performed if the view should be dismissed.
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| /// Provides a task modifier with an optional binding that will run the task if the binding is set to a | |
| /// non-nil value and reset it to nil once the task is done. | |
| /// | |
| /// The purpose of this is to bind a one-shot task to the view, i.e. the cancellation is automatically | |
| /// performed if the view should be dismissed. | |
| struct TaskViewModifier<T: Equatable>: ViewModifier { | |
| @Binding var taskId: T? | |
| let action: @Sendable (_: T) async -> Void | |
| func body(content: Content) -> some View { | |
| ZStack { | |
| content | |
| .task(id: taskId) { | |
| guard let taskId = taskId else { | |
| return | |
| } | |
| await action(taskId) | |
| self.taskId = nil | |
| } | |
| } | |
| } | |
| } | |
| public extension View { | |
| /// Provides a task modifier with an optional binding that will run the task if the binding is set to a | |
| /// non-nil value and reset it to nil once the task is done. | |
| /// | |
| /// The purpose of this is to bind a one-shot task to the view, i.e. the cancellation is automatically | |
| /// performed if the view should be dismissed. | |
| /// | |
| /// - Parameters: | |
| /// - taskId: A binding to an optional `T` that will trigger the task when set to a non-nil value. | |
| /// - action: The async action to perform. | |
| func task<T: Equatable>(_ value: Binding<T?>, _ action: @escaping @Sendable (_: T) async -> Void) -> some View { | |
| modifier(TaskViewModifier<T>(taskId: value, action: action)) | |
| } | |
| } |
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