如何解决带有 NavigationLink 和函数调用 SwiftUI 的按钮
我有条件的 NavigationLinks 问题。它没有响应我的预期。当用户单击按钮时,必须调用函数“test”并给出返回值。如果返回值为 true,则必须直接打开“SheetView”,而无需单击 NavigationLink 文本。请有人可以帮我解决这个问题。提前致谢
import SwiftUI
struct LoginView: View {
@State var check = false
@State var answer = false
var body: some View {
NavigationView {
vstack{
Text("it doesn't work")
Button(action: {
answer = test(value: 2)
if answer {
//if the return value is true then directly navigate to the sheetview
NavigationLink(
destination: SheetView(),label: {
Text("Navigate")
})
}
},label: {
Text("Calculate")
})
}
}
}
func test(value: Int) -> Bool {
if value == 1 {
check = false
} else {
print("Succes")
check = true
}
return check
}
}
struct SheetView: View {
var body: some View {
NavigationView {
vstack{
Text("Test")
.font(.title)
}
}
}
}
解决方法
如果您尝试呈现工作表(因为您调用了导航目标 SheetView),则 Yodagama 的答案有效,但如果您尝试导航到 SheetView 而不是呈现工作表,则以下代码将执行此操作。
>struct LoginView: View {
@State var check = false
@State var answer = false
var body: some View {
NavigationView {
VStack{
Text("it doesn't work")
NavigationLink(destination: SheetView(),isActive: $answer,label: {
Button(action: {
answer = test(value: 2)
},label: {
Text("Calculate")
})
})
}
}
}
func test(value: Int) -> Bool {
if value == 1 {
check = false
} else {
print("Succes")
check = true
}
return check
}
}
struct SheetView: View {
var body: some View {
NavigationView {
VStack{
Text("Test")
.font(.title)
}
}
}
}
,
struct LoginView: View {
@State var check = false
@State var answer = false
var body: some View {
NavigationView {
VStack{
Text("it doesn't work")
Button(action: {
answer = test(value: 2)
//<= here
},label: {
Text("Calculate")
})
}
.sheet(isPresented: $answer,content: { //<= here
SheetView()
})
}
}
...
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