Question

想知道我如何确定用户是否支持Touch ID API的设备？希望将此值作为布尔值。

谢谢！

Answer 1

试试这个：

- (BOOL)canAuthenticateByTouchId {
    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0")) {
        return [[[LAContext alloc] init] canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:nil];
    }
    return NO;
}

或者像@rckoenes建议：

- (BOOL)canAuthenticateByTouchId {
    if ([LAContext class]) {
        return [[[LAContext alloc] init] canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:nil];
    }
    return NO;
}

<强>更新

我忘记了，请检查：How can we programmatically detect which iOS version is device running on?来定义SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO

Answer 2

您应该考虑触摸ID身份验证所需的LAContext框架。

参数LAErrorTouchIDNotAvailable将显示设计支持此功能。

代码段：

- (IBAction)authenticateButtonTapped:(id)sender {
    LAContext *context = [[LAContext alloc] init];

    NSError *error = nil;

    if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
        // Authenticate User

    } else {

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                        message:@"Your device cannot authenticate using TouchID."
                                                       delegate:nil
                                              cancelButtonTitle:@"Ok"
                                              otherButtonTitles:nil];
        [alert show];

    }
}

了解此功能的好教程是here。

Answer 3

您可以使用CanEvaluatePolicy检查错误。如果错误代码为-6，则表示该设备上没有物理Touch Id。你可以从错误描述中看出来，它说

此设备无法使用Biometry。

以下是您使用C＃Xamarin时的代码：

var context = new LAContext();
        NSError AuthError;
        if (!context.CanEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, out AuthError))
        {
            if ( AuthError != null && AuthError.Code == -6 )
            {
                var alert = new UIAlertView ("Error", "TouchID not available", null, "BOOO!", null);
                alert.Show ();
            }
        }

Answer 4

这个功能对此有帮助 -

-(BOOL)doesThisDeviceSupportTouchIdForLocalAuthentication{

    //Checking for 64 bit (armv7s) architecture before including the LAContext as it would give error otherwise.
    #if TARGET_CPU_ARM64
    LAContext *context = [[LAContext alloc] init];

    NSError *error = nil;

    if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]){
        return YES;
    }
    return NO;
    #endif

    return NO;
}

Answer 5

目标c

@import LocalAuthentication;
// Get the local authentication context:
LAContext *context = [[LAContext alloc] init];
// Test if fingerprint authentication is available on the device and a fingerprint has been enrolled.
if ([context canEvaluatePolicy: LAPolicyDeviceOwnerAuthenticationWithBiometrics error:nil])
{
    NSLog(@"Fingerprint authentication available.");
}

如果设备支持Touch ID

5 个答案: