ios使用touchId，iostouchid

ios使用touchId，iostouchid

#import <LocalAuthentication/LAContext.h>

    LAContext *myContext = [[LAContext alloc] init];        NSError *authError = nil;        NSString *myLocalizedReasonString = @"請輸入指紋";            if ([myContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&authError]) {//判斷是否有指紋識別                [myContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics                           localizedReason:myLocalizedReasonString                                     reply:^(BOOL success, NSError *error) {                                                                if (success) {                                    UIAlertView *al = [[UIAlertView alloc]initWithTitle:nil message:@"success" delegate:nil cancelButtonTitle:@"確定" otherButtonTitles: nil];                                    [al show];                                    NSLog(@"success");                                    // User authenticated successfully, take appropriate action                                                                    } else {                                    UIAlertView *al = [[UIAlertView alloc]initWithTitle:nil message:@"失敗" delegate:nil cancelButtonTitle:@"確定" otherButtonTitles: nil];                                    [al show];                                    NSLog(@"faill");                                                                    }                                                            }];            } else {                // Could not evaluate policy; look at authError and present an appropriate message to user            }