按钮不更改SwiftUI中的视图

时间:2020-02-04 02:02:03

标签: swiftui swiftui-navigationlink

所以在我的ContentView.swift中,我有以下代码:

import SwiftUI

extension UIScreen{
   static let screenWidth = UIScreen.main.bounds.size.width
   static let screenHeight = UIScreen.main.bounds.size.height
   static let screenSize = UIScreen.main.bounds.size
}

struct ContentView: View {
    @State var Direction: Int = 0
    @State var ButtonsShowing: Bool = true
    @State var View: Int = 0

    func MoveLeft() {
        if ButtonsShowing == true {
            ButtonsShowing = false
        }
    }

    func MoveRight() {
        if ButtonsShowing == true {
            ButtonsShowing = false
        }
        Direction = 1
    }

    var body: some View {
        ZStack {
            Image("Space").resizable()
                .frame(width: UIScreen.screenWidth, height: UIScreen.screenHeight + 50)
                .edgesIgnoringSafeArea(.all)

            VStack {
                HStack {
                    Button(action: MoveLeft) {
                        if ButtonsShowing == true {
                            NavigationLink(destination: Playing()) {
                                Image("LeftClick")
                                    .frame(width: UIScreen.screenWidth / 2, height: UIScreen.screenHeight)
                            }

                        }
                    }

                    Spacer()

                    Button(action: MoveRight) {
                        if ButtonsShowing == true {
                            Image("RightClick")
                                .frame(width: UIScreen.screenWidth / 2, height: UIScreen.screenHeight)
                        }
                    }
                }
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

我得到了一个预览: Preview of button with NavigationLink

如果您朝我的LeftClick按钮看,我希望它可以将我带到另一个视图,但不知道如何。我有一个NavigationLink,目标是其他视图(Playing.swift,如果需要知道的话,我可以使用Playing()调用它)

很明显我在做错事,[[希望]]可以肯定是从按钮而不是从其他视图发出的:

NavigationLink(destination: Playing()) {
    Image("LeftClick")
        .frame(width: UIScreen.screenWidth / 2, height: UIScreen.screenHeight)
}

谢谢。

1 个答案:

答案 0 :(得分:0)

在您的ZStack之前添加一个NavigationView,如果没有NavigationView,NavigationLink将无法工作。

var body: some View {
  NavigationView {
    ZStack {
    ...
    }
  }
}