CODEWITHSUNDEEP
swiftuipresentmodalviewcontrollerswiftui-navigationlinkswiftui-navigationview
Josh Byanec McFergan
Josh Byanec McFergan

Reputation: 491

How to Push View or Present View Modally in SwiftUI dynamically?

I'm learning SwiftUI and my focus at the moment is to implement a method which I'm able to implement using UIKit. I need to create a method the determines whether I should Push the View or Present modally the view based on the value of a boolean.

In UIKit, my code is:

var presentVC = true // boolean that determines whether VC will be presented or pushed

let vc = ViewController() //Your VC that will be pushed or presented

if (presentVC == true) {
     self.presentViewController(vc, animated: true, completion: nil)
} else {
    self.navigationController.pushViewController(vc, animated: true)
}

But in SwiftUI, I'm not sure how to implement this correctly using the:

It seems that the NavigationLink and .sheet modifier is coupled with the view implementation. Does anyone already encountered and solve this scenario in SwiftUI? Thanks

I'm using SwiftUI 1.0 as I need to support iOS 13.

Upvotes: 3

Views: 4199

Answers (1)

pawello2222
pawello2222

Reputation: 54466

A possible solution is to create a custom enum with available presentation types:

enum PresentationType {
    case push, sheet // ...
}

and create a custom binding for activating different views:

func showChildView(presentationType: PresentationType) -> Binding<Bool> {
    .init(
        get: { self.showChildView && self.presentationType == presentationType },
        set: { self.showChildView = $0 }
    )
}

Full code:

struct ContentView: View {
    @State var presentationType = PresentationType.push
    @State var showChildView = false

    func showChildView(as presentationType: PresentationType) -> Binding<Bool> {
        .init(
            get: { self.showChildView && self.presentationType == presentationType },
            set: { self.showChildView = $0 }
        )
    }

    var body: some View {
        NavigationView {
            VStack {
                Button(action: {
                    self.presentationType = .push
                    self.showChildView = true
                }) {
                    Text("Present new view as Push")
                }
                Button(action: {
                    self.presentationType = .sheet
                    self.showChildView = true
                }) {
                    Text("Present new view as Sheet")
                }
            }
            .navigationBarTitle("Main view", displayMode: .inline)
            .background(
                NavigationLink(
                    destination: ChildView(),
                    isActive: self.showChildView(presentationType: .push),
                    label: {}
                )
            )
        }
        .sheet(isPresented: self.showChildView(presentationType: .sheet)) {
            ChildView()
        }
    }
}

struct ChildView: View {
    var body: some View {
        ZStack {
            Color.red
            Text("Child view")
        }
    }
}

Upvotes: 5

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