@Binding 和向下滚动以关闭呈现的视图有什么区别? [英] What is different between @Binding and scroll down to dismiss presented view?
问题描述
NavigationBarItem 在关闭视图后无法点击!
NavigationBarItem can't Click after dismiss view!
XCode11 beta3,MacOS Catalina 10.15 Beta(19A501i)
XCode11 beta3, MacOS Catalina 10.15 Beta(19A501i)
当点击DetailView按钮被@Binding关闭时,ContentView 的 navigationBarItem 将被禁用(无法点击)!但是向下滚动以关闭就可以了(可以单击并在调试预览模式下打印单击!")
When click DetailView button to dismiss by @Binding, ContentView's navigationBarItem will disabled(Can't Click)! But scroll down to dismiss will be fine(can click and will be print "Clicked!" in Debug Preview Mode)
struct DetailView: View {
@Binding var isPresented: Bool
var body: some View {
Group {
Text("Detail")
Button(action: {
self.isPresented.toggle()
}) {
Text("Dismiss")
}
}
}
}
struct ContentView : View {
@State var isPresented = false
var body: some View {
NavigationView{
Button(action: {self.isPresented.toggle()}){
Text("Show")
}
.presentation(!isPresented ? nil :
Modal(DetailView(isPresented: $isPresented)) {
print("dismissed")
}
)
.navigationBarTitle(Text("Test"))
.navigationBarItems(trailing:
Button(action: {print("Clicked!")} ) {
Image(systemName: "plus")
.frame(width: 44, height: 44)
.foregroundColor(.black)
.cornerRadius(22)
}
.padding(.trailing)
)
}
}
}
推荐答案
我倾向于认为模态存在错误.onDismiss
在模态消失时永远不会被调用.但是,我确实找到了解决方法.我没有通过在模态视图内部设置 isPresented 变量来关闭,而是使用主窗口中的 rootViewController 来调用 UIKit 关闭方法.
I'm inclined to think that there is a bug with modals. The onDismiss
is never called when the modal goes away. However, I did found a workaround. Instead of dismissing by setting the isPresented variable from inside the modal view, I use the rootViewController from the main window, to call the UIKit dismiss method.
通过这种方式关闭模态,onDismiss 闭包被正确调用,并且在那里我设置 isPresented = false,因此模态可以再次呈现.
By dismissing the modal this way, the onDismiss closure is called properly, and it is there where I set isPresented = false, so the modal can be presented again.
以下代码有效,至少在新版本解决问题之前:
The following code works, at least until a new version fixes the problem:
import SwiftUI
struct DetailView: View {
var body: some View {
Group {
Text("Detail")
Button(action: {
UIApplication.shared.windows[0].rootViewController?.dismiss(animated: true, completion: { })
}) {
Text("Dismiss")
}
}
}
}
struct ContentView : View {
@State var isPresented = false
var body: some View {
NavigationView{
Button(action: {self.isPresented.toggle()}){
Text("Show")
}
.presentation(!isPresented ? nil :
Modal(DetailView()) {
self.isPresented = false
print("dismissed")
}
)
.navigationBarTitle(Text("Test"))
.navigationBarItems(trailing:
Button(action: {print("Clicked!")} ) {
Image(systemName: "plus")
.frame(width: 44, height: 44)
.foregroundColor(.black)
.cornerRadius(22)
}
.padding(.trailing)
)
}
}
}
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