如何从HTTPS云函数返回错误

Question

从iOS应用程序调用云函数如下所示：

var functions = Functions.functions()
functions.httpsCallable(name).call(data){ (result, error) in
// Code here
}

我如何从我的云函数发送错误，这样它就会在上面的代码中被发现？例如：

云功能：

exports.joinGame = functions.https.onCall((data, context) => {
return Error("The game is full")
})

SwiftUI:

var functions = Functions.functions()
functions.httpsCallable("joinGame").call(data){ (result, error) in
print(error) // "The game is full"
}

Answer 1

我仍然不确定您想在哪里返回错误。。。但这里有一些可能处理的变体：

@State private var error: Error?
var body: some View {
VStack {
Text("Wait for Error")
.onAppear {
functions.httpsCallable("joinGame").call(data){ (result, error) in
print(error) // "The game is full"
DispatchQueue.main.async {
self.error = error
}
}
}
if nil != error {
Text("Got error!")   // << do anything with error here
}
}
.onChange(of: error) { newError in
// << or here 
}
}