我正在制作一个应用程序，在其中输入两个数字，并希望在单击按钮时在第二个屏幕中显示数字的相加结果。我可以在控制台中打印结果，但不幸的是，按钮周围的导航链接似乎不起作用。如果我将 NavigationLink 放在按钮标签周围而不是整个按钮周围，那么它会转到第二个屏幕，但按钮操作停止工作。这是我的代码：
import SwiftUI
struct ContentView: View {
@State private var number1 : String = ""
@State private var number2: String = ""
@State private var isTapped:Bool = false
@State var sum : Double = 0
var body: some View {
NavigationView {
VStack{
TextField("Type first number", text: $number1)
.keyboardType(.numberPad).padding()
.textFieldStyle(RoundedBorderTextFieldStyle())
.background(Color.gray).border(Color.blue,width:5)
TextField("Type second number", text: $number2)
.keyboardType(.numberPad).padding()
.textFieldStyle(RoundedBorderTextFieldStyle())
.background(Color.gray).border(Color.blue,width:5)
//this Navigationlink is not working
NavigationLink(destination: Text("\(self.sum)")) {
Button(action: {
print("I am here in the action")
self.isTapped.toggle()
UIApplication.shared.endEditing()
if let num1 = Double(self.number1), let num2 = Double(self.number2){
print("I am here")
self.sum = num1 + num2
print("\(self.sum)")
}
}) {
//If I put the Navigationlink here, button action stop working.
Text("Add Two Numbers")
.padding()
.foregroundColor(.blue)
.background( isTapped ? Color.orange : Color.gray)
.font(.title)
.border(Color.blue, width: 5)
.shadow(radius: 10)
}
}
}
}
}
}
extension UIApplication {
func endEditing() {
sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
有什么线索吗？感谢您的好奇心。
NavigationLink实际上，它本身就是一个按钮，所以你引入了某种冲突。相反，您可以仅将链接与其他点击手势处理程序一起使用，例如
NavigationLink(destination: Text("\(self.sum)")) {
Text("Add Two Numbers")
.padding()
.foregroundColor(.blue)
.background(isTapped ? Color.orange : Color.gray)
.font(.title)
.border(Color.blue, width: 5)
.shadow(radius: 10)
}
.simultaneousGesture(TapGesture().onEnded{
print("I am here in the action")
self.isTapped.toggle()
UIApplication.shared.endEditing()
if let num1 = Double(self.number1), let num2 = Double(self.number2){
print("I am here")
self.sum = num1 + num2
print("\(self.sum)")
}
})
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