指纹识别 touch id的简单使用

下面截取关键代码的图片

 1 #import <LocalAuthentication/LocalAuthentication.h>//引入头文件
 2 
 3 
 4 - (void)yanzheng
 5 {
 6     LAContext *lac = [[LAContext alloc] init];
 7     BOOL isSupport = [lac canEvaluatePolicy:kLAPolicyDeviceOwnerAuthenticationWithBiometrics error:NULL];
 8     lac.localizedFallbackTitle = NSLocalizedString(@"请输入密码", nil);
 9     if (isSupport) {
10         [lac evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"请输入您的Touch ID" reply:^(BOOL success, NSError * _Nullable error) {
11             if (success) {
12                 dispatch_async(dispatch_get_main_queue(), ^{
13                     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"验证通过" delegate:self cancelButtonTitle:@"好" otherButtonTitles:nil, nil];
14                     [alert show];
15                 });
16             }else if([error.userInfo[@"NSLocalizedDescription"] isEqualToString:@"Canceled by user."]){
17                 dispatch_async(dispatch_get_main_queue(), ^{
18                     return ;
19                 });
20             }else{
21                 dispatch_async(dispatch_get_main_queue(), ^{
22                    [self alertViewWithEnterPassword:YES];
23                 });
24             }
25         }];
26     }else{
27         NSLog(@"当前机型不支持");
28     }
29 }

上面这段代码是进行验证的关键代码和判断，其中包括验证成功，验证失败，和取消验证。

如果验证失败，可以弹出一个输入密码的提示框，代码如下

 1 - (void)alertViewWithEnterPassword:(BOOL)isTrue
 2 {
 3     UIAlertController *alert;
 4     if (isTrue) {
 5         alert = [UIAlertController alertControllerWithTitle:@"请输入密码" message:@"请输入您的支付密码" preferredStyle:UIAlertControllerStyleAlert];
 6     }else{
 7         alert = [UIAlertController alertControllerWithTitle:@"密码错误" message:@"请输入您的支付密码" preferredStyle:UIAlertControllerStyleAlert];
 8     }
 9     [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
10         textField.secureTextEntry = YES;
11     }];
12     UIAlertAction *backAction = [UIAlertAction actionWithTitle:@"返回指纹验证" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
13         [self yanzheng];
14     }];
15     
16     UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
17         if ([alert.textFields.firstObject.text isEqualToString:@"123"]) {
18             UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"验证通过" delegate:self cancelButtonTitle:@"好" otherButtonTitles:nil, nil];
19             [alert show];
20         }else{
21             [self alertViewWithEnterPassword:NO];
22         }
23     }];
24     [alert addAction:backAction];
25     [alert addAction:confirmAction];
26     [self presentViewController:alert animated:YES completion:nil];
27 }