iOS指纹识别

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#import "ViewController.h"
#import <LocalAuthentication/LocalAuthentication.h>
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    btn.frame = CGRectMake(120, 90, 100, 40);
    [btn setTitle:@"点击" forState:UIControlStateNormal];
    [btn setBackgroundColor:[UIColor redColor]];

    [btn addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:btn];
}
-(void)click
{
    LAContext *authenticationContext = [[LAContext alloc]init];

    NSError* error = [[NSError alloc]init];

    BOOL  isTouchIdAailable = [authenticationContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error];

    if (isTouchIdAailable)
    {
        NSLog(@"认证策略成功");
        [authenticationContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"需要验证您的指纹来确认您的身份信息" reply:^(BOOL success, NSError * _Nullable error) {
            if(success) {
                NSLog(@"恭喜，您通过了Touch ID指纹验证!");
            }
        else
          {
               NSLog(@"抱歉，您未通过了Touch ID指纹验证!");
            }
        }];}
    else
    {
        NSLog(@"认证策略失败,error ===  %@",error);
    }
}

@end