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[英]navigationBarItems “Type [view] cannot conform to 'View'; only struct/enum/class types can conform to protocols”
[英]Type '()' cannot conform to 'View'; only struct/enum/class types can conform to protocols
我目前正在學習 swift,我正在嘗試制作一個簡單的應用程序來顯示您是否已連接到互聯網,但我不斷收到以下錯誤:
類型 '()' 不能符合 'View'; 只有結構/枚舉/類類型可以符合協議
這是代碼:
struct ContentView: View {
let NetworkMonitor = NWPathMonitor(requiredInterfaceType: .wifi)
var body: some View {
VStack { //Line with the error
Text("Network Check")
NetworkMonitor.pathUpdateHandler = {path in
if path.status == .satisfied {
Text("We are Connected")
} else {
Text("We are not connected")
}
}
}
}
}
我曾嘗試刪除 VStack 和“網絡檢查”文本,但它在var 正文上發送另一個錯誤:一些視圖行:
Function 聲明了一個不透明的返回類型,但在其主體中沒有返回語句來推斷基礎類型
謝謝
由於您正在調用 function,因此您無法在視圖構造中執行此操作,請嘗試在 onAppear 中調用它:
struct ContentView: View {
let NetworkMonitor = NWPathMonitor(requiredInterfaceType: .wifi)
@State var status = false
var body: some View {
VStack {
Text("Network Check")
if status {
Text("We are Connected")
} else {
Text("We are not connected")
}
}.onAppear() {
NetworkMonitor.pathUpdateHandler = { path in
self.status = path.status == .satisfied
}
}
}
}
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