Is it possible to update a view based of two values with the .task modifier-CodePudding

I have a view, which will update once the users location changes:

...
    .task(id: locationManager.currentLocation){
    
    ...
    
    }

I have added a setting which requires the view to update even if their location hasn't. How would I act on both so that the view updates if the location changes or the setting (bool) is changed? Can I use two values within the .task() modifier:

.task(id: locationManager.currentLocation, someBoolForSetting)

CodePudding user response：

It could be something as simple as a String that combines the 2

.task(id: "\(locationManager.currentLocation) \(someBoolForSetting)")

Or a simple struct if you want to do something fancier

struct TaskId: Equatable{
    var location: CLLocation
    var bool: Bool
}

 }.task(id: TaskId(location: locationManager.currentLocation, bool: someBoolForSetting)) {

You can customize the Equatable conformance with the second one like only trigger a change if the coordinates have changed but not the speed

CodePudding user response：

If you create an Equatable struct that contains the Location and the Bool, you can use that as the task id, e.g.

struct Model: Equatable {
    var location: CLLocation = .init() {
        didSet {
            print("location", location)
        }
    }
    var someBoolForSetting: Bool = false {
        didSet {
            print("someBoolForSetting", someBoolForSetting)
        }
    }
}

struct ContentView: View {
    
    @State private var model = Model()

    var body: some View {
        VStack {
            Button("Update location") {
                model.location = CLLocation(latitude: CLLocationDegrees.random(in: -90...90), longitude: CLLocationDegrees.random(in: -180...180))
            }
            .buttonStyle(.borderedProminent)
            Button("toggle setting") {
                model.someBoolForSetting.toggle()
            }
            .buttonStyle(.borderedProminent)
        }
        .padding()
        .task(id: model) {
            print("Starting Task")
            try? await Task.sleep(nanoseconds: 1_000_000_000)
            print("Finishing Task")
        }
    }
}

Starting Task
Finishing Task
location <-15.42715506,-109.30132874>  /- 0.00m (speed -1.00 mps / course -1.00) @ 10/01/2023, 12:37:14 Greenwich Mean Time
Starting Task
Finishing Task
someBoolForSetting true
Starting Task
Finishing Task
someBoolForSetting false
Starting Task
Finishing Task