iOS指纹识别

 1 -(void)CreateFingerPrint{
 2     LAContext *myContext = [[LAContext alloc] init];
 3     NSError *authError = nil;
 4     NSString *myLocalizedReasonString = @"请验证已有指纹";
 5
 6     // 判断设备是否支持指纹识别
 7     if ([myContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&authError]) {
 8         if ([[[NSUserDefaults standardUserDefaults]objectForKey:@"zhiwenshibie"]isEqualToString:[Finance_Tools getUserID]]) {
10             // 指纹识别只判断当前用户是否机主
12             [myContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
13                       localizedReason:myLocalizedReasonString
14                                 reply:^(BOOL success, NSError *error) {
15                                     if (success) {
16                                         // User authenticated successfully, take appropriate action
17                                         NSLog(@"指纹认证成功");
18                                         dispatch_async(dispatch_get_main_queue(), ^{
19
20                                         [self createTiXianDownload:[[NSUserDefaults standardUserDefaults] objectForKey:@"PassWord"]];
21                                         });
26                                     } else {
27                                         NSLog(@"指纹认证失败，%@",error.description);
28
29                                         dispatch_async(dispatch_get_main_queue(), ^{
30
31                                             //回到主线程操作代码块
32                                             if ([[@(error.code) stringValue] isEqualToString:@"-2"]||[[@(error.code) stringValue] isEqualToString:@"-4"]) {
33                                             }else if ([[@(error.code) stringValue] isEqualToString:@"-3"]||[[@(error.code) stringValue] isEqualToString:@"-8"]||[[@(error.code) stringValue] isEqualToString:@"-1"]){
34                                                 //失败原因，弹出弹框输入密码
35
36                                             }
37
38                                         });
39
40
41                                     }
42                                 }];
43
44         }else{
45             //开启指纹识别
46         }
47     } else {
48         // Could not evaluate policy; look at authError and present an appropriate message to user
49         NSLog(@"TouchID设备不可用");
50         // TouchID没有设置指纹
51         // 关闭密码（系统如果没有设置密码TouchID无法启用）
52
53//弹出弹框输入密码

56}

57}

失败原因：

1   NSLog(@"指纹认证失败，%@",error.description);
2                                     // 错误码 error.code
3                                     // -1: 连续三次指纹识别错误
4                                     // -2: 在TouchID对话框中点击了取消按钮
5                                     // -3: 在TouchID对话框中点击了输入密码按钮
6                                     // -4: TouchID对话框被系统取消，例如按下Home或者电源键
7                                     // -8: 连续五次指纹识别错误，TouchID功能被锁定，下一次需要输入系统密码
8