SwiftUI手动更新查看

Question

Traditionally, a SwiftUI application will automatically update its view in response to any state changes. This occurs when the @State propertyWrapper detects any updates. I'm curious, is it possible to manually redraw a SwiftUI View, instead of relying on the @State data binding technique?

Answer 1

You can use an ObservableObject object as model and then call objectWillChange.send() to trigger a refresh

struct MyView : View {
    @ObservedObject var model: Model
    var body: some View { .. }
}

class Model: ObservableObject { 
    func reloadView() {
        objectWillChange.send()
    } 
}