iOS Touch ID指纹识别技术简介

#import <UIKit/UIKit.h> @interface HWTouchIDTestVC : UIViewController @end  #import "HWTouchIDTestVC.h"#import <LocalAuthentication/LocalAuthentication.h> @interface HWTouchIDTestVC () @property (nonatomic, weak) UILabel *label; @end @implementation HWTouchIDTestVC - (void)viewDidLoad { [super viewDidLoad];  self.view.backgroundColor = [UIColor blackColor];  //创建控件 [self creatControl];} - (void)creatControl{ //测试按钮 UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(50, 200, 120, 50)]; btn.backgroundColor = [UIColor orangeColor]; [btn setTitle:@"测试按钮" forState:UIControlStateNormal]; [btn addTarget:self action:@selector(btnOnClick) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:btn];  //提示标签 UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(220, 200, 120, 50)]; label.text = @"测试标签"; label.textAlignment = NSTextAlignmentCenter; label.backgroundColor = [UIColor yellowColor]; [self.view addSubview:label]; self.label = label;} - (void)btnOnClick{ //初始化 LAContext *context = [[LAContext alloc] init]; NSError *error = nil; //显示的文字 NSString *str = @"指纹验证"; //判断是否能进行验证 if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) { [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:str reply:^(BOOL success, NSError * _Nullable error) {  if (success) { NSLog(@"验证成功"); dispatch_async(dispatch_get_main_queue(), ^{  self.label.text = @"验证成功";  self.label.backgroundColor = [UIColor greenColor]; });  }else { NSLog(@"验证失败，error：%@", error); dispatch_async(dispatch_get_main_queue(), ^{  self.label.text = @"验证失败";  self.label.backgroundColor = [UIColor redColor]; }); } }];  }else { NSLog(@"无法验证指纹，error: %@", error); self.label.text = @"无法验证"; }} @end