SwiftUI, iOS: How to access public function inside @main struct from custom internal View?

Question

How to access achieveTo() inside @main struct from CustomInternalView()?

@main
struct MyApp: App {
    
    var body: some Scene {
        WindowGroup {
            CustomInternalView()
        }
    }

    public func achieveTo() {
        // Do stuff
    }
}


struct CustomInternalView: View {
    var body: some View {
         Text("Some")
    }
    .onDisappear {
        // How to call "achieveTo" from here????????????
    }
}

In UIKit it is like UIApplication.shared.windows.first!.rootViewController as! YourViewController, How about SwiftUI?

You don’t, work with state instead like using a State/Binding solution or an EnvironmentObject so that one view changes the state and the other reacts on the change (and calls achieveTo) — Joakim Danielson
– Joakim Danielson, Commented Aug 16, 2021 at 14:57
If an answer worked, can you click the green checkmark to accept it? — aheze
– aheze, Commented Aug 28, 2021 at 4:03

aheze · Accepted Answer · 2021-08-16 14:57:15Z

2

You can add a closure:

@main
struct MyApp: App {
    
    var body: some Scene {
        WindowGroup {
            CustomInternalView {
                achieveTo() /// 2. Assign closure
            }
        }
    }

    public func achieveTo() {
        // Do stuff
    }
}
struct CustomInternalView: View {
    var callParentTask: (() -> Void) /// 1. Define closure
    
    var body: some View {
         Text("Some")
            .onDisappear(perform: callParentTask) /// 3. Call closure
    }
}

Note: Your onDisappear must be attached to a View inside the var body: some View {, not outside.

answered Aug 16, 2021 at 14:57

aheze

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swiftPunk · Accepted Answer · 2021-08-22 05:02:11Z

2

Another simpler version of what @aheze answered:

import SwiftUI

@main
struct MyApp: App {
    var body: some Scene {
        
        WindowGroup {
            
            CustomInternalView()
                .onDisappear() { achieveTo() }

        }
    }
}

func achieveTo() {
    // Do stuff
}

struct CustomInternalView: View {

    var body: some View {
         Text("Some")
    }

}

edited Aug 22, 2021 at 5:02

answered Aug 22, 2021 at 4:57

swiftPunk

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