用户取消了touchID实现错误

Question

如何解决TouchId错误：Domain=com.apple.LocalAuthentication Code=-2 "Canceled by user."

我试图再次添加本地上下文：

let myContext = LAContext()
let myLocalizedReasonString = "Please use your last login for Inspyrus Supplier Central."        

var authError: NSError?
if #available(iOS 8.0, macOS 10.12.1, *) {
    if myContext.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &authError) {
        myContext.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: myLocalizedReasonString) { success, evaluateError in
            DispatchQueue.main.async {
                if success {
                    self.btnLoginClicked(UIButton())
                } else {
                    print(evaluateError?.localizedDescription ?? "Failed to authenticate")
                    // Fall back to a asking for username and password.
                    // ...
                }
            }
        }
    }
}

Answer 1

您可以检查从evaluateError调用返回的evaluatePolicy是否为LAError.userCancel。

类似这样的东西：

LAError.userCancel