SwiftUI: Global Binding Date Variable

January 27, 2022

I’m trying to create a Global Binding Date that I can use across multiple areas of my App.

Essentially, I want to allow the use to change ‘todays date’ to any future date and update the rest of my app accordingly.

I’ve tried creating a GlobalVariables class in a Swift file, but getting a bit lost as to how to create the variable correctly (the below code errors)

class GlobalVariables: ObservableObject {
    
    @Binding var myDate: Date = Date()
    
}

I want to then use a DatePicker in another View to update the myDate variable, which will then update the other bits of my App.

Thanks

>Solution :

You should use @Published property wrapper. This way it will publish any changes and update the UI accordingly.

class GlobalVariables: ObservableObject {

    @Published var myDate = Date()

}

You also need to inject the same instance of your GlobalVariables in order to sync all views. You can use environment object or dependency injection with other methods.

struct MainView: View {
    @StateObject globalVariables = GlobalVariables()

    var body: some View {
        VStack {
            FirstView()
                .environmentObject(globalVariables)

            SecondView()
                .environmentObject(globalVariables)
        }
    }
}

struct FirstView: View {
    @EnvironmentObject globalVariables: GlobalVariables
    
    var body: some View {
        DatePicker("", selection: $globalVariables.myDate)
    }
}

struct SecondView: View {
    @EnvironmentObject globalVariables: GlobalVariables
    
    var body: some View {
        DatePicker("", selection: $globalVariables.myDate)
    }
}