[英]Push, Segue, Summon, Navigate to View Programmatically SwiftUI
I'm trying to do the simplest of things. 我正在尝试做最简单的事情。 I just want to summon a new SwiftUI view programmatically - not with a button, but with code. 我只想以编程方式调用新的SwiftUI视图-而不是按钮,而是代码。 I've read a couple of dozens posts and Apple docs on this - but almost all that I've found relates to code that has been renamed or deprecated. 我已经阅读了数十篇有关此问题的文章和Apple文档-但我发现的几乎所有内容都与已重命名或不推荐使用的代码有关。 The closest I have found is: 我找到的最接近的是:
NavigationLink(destination: NewView(), isActive: $something) {
EmptyView()
}
But this does not work for me in Xcode Beta 7. Here's the trivial app: 但这在Xcode Beta 7中对我不起作用。这是简单的应用程序:
struct ContentView: View {
@State private var show = false
var body: some View {
VStack {
Text("This is the ContentView")
Toggle(isOn: $show) {
Text("Toggle var show")
}
.padding()
Button(action: {
self.show = !self.show
}, label: {
Text(self.show ? "Off" : "On")
})
Text(String(show))
//this does not work - the ContentView is still shown
NavigationLink(destination: SecondView(), isActive: $show)
{
EmptyView()
}
//this does not work - it adds SecondView to ContentView
//I want a new view here, not an addition
//to the ContentView()
// if show {
// //I want a new view here, not an addition to the ContentView()
// SecondView()
// }
}
}
}
And the brutally simple destination: 而残酷的目的地:
struct SecondView: View {
var body: some View {
Text("this is the second view!")
}
}
I must be missing something extremely simple. 我一定会错过一些非常简单的东西。 Any guidance would be appreciated. 任何指导将不胜感激。 iOS 13.1, Catalina 19A546d, Xcode 11M392r iOS 13.1,Catalina 19A546d,Xcode 11M392r
A couple of things. 有几件事。 First, NavigationLink must be imbedded in a NavigationView to work. 首先,必须将NavigationLink嵌入到NavigationView中才能工作。 Second, the link doesn't need a view as you showed it. 其次,该链接不需要您显示的视图。 This should show the second view. 这应该显示第二个视图。 I will leave to you to update the other elements. 我将请您更新其他元素。
var body: some View {
NavigationView{
VStack {
Text("This is the ContentView")
Toggle(isOn: $show) {
Text("Toggle var show")
}
.padding()
Button(action: {
self.show = !self.show
}, label: {
Text(self.show ? "Off" : "On")
})
Text(String(show))
//this does not work - the ContentView is still shown
NavigationLink(destination: SecondView()){
Text("Click to View")}
Spacer()
// {
// EmptyView()
// }
//this does not work - it adds SecondView to ContentView
//I want a new view here, not an addition
//to the ContentView()
// if show {
// //I want a new view here, not an addition to the ContentView()
// SecondView()
// }
}
}
}
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