我正在使用以下例程来获取触摸ID工作我知道touch id只会告诉我他们是设备的所有者，但我想知道的是为什么需要五秒钟才能返回UI。我得到了成功，所以我没有我的代码工作正常，但我不知道为什么它花了五秒钟。
另外，触摸id只返回真或假，我们真的要依赖它。我们在输入他们通常的电子邮件和密码后要求联系，或者我应该将其存储在iPhone密钥链中我不确定这里的最佳做法是什么。
- (IBAction)btnLogin:(id)sender {
LAContext *context = [[LAContext alloc] init];
NSError *error = nil;
if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
[context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
localizedReason:@"Are you the device owner?"
reply:^(BOOL success, NSError *error) {
if (error) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
message:@"There was a problem verifying your identity."
delegate:nil
cancelButtonTitle:@"Ok"
otherButtonTitles:nil];
[alert show];
return;
}
if (success) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Success"
message:@"You are the device owner!"
delegate:nil
cancelButtonTitle:@"Ok"
otherButtonTitles:nil];
[alert show];
} else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
message:@"You are not the device owner."
delegate:nil
cancelButtonTitle:@"Ok"
otherButtonTitles:nil];
[alert show];
}
}];
} else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
message:@"Your device cannot authenticate using TouchID."
delegate:nil
cancelButtonTitle:@"Ok"
otherButtonTitles:nil];
[alert show];
}
}