iOSTouchID指纹识别技术简介

#import 
 
@interface HWTouchIDTestVC : UIViewController
 
@end
 
 
#import "HWTouchIDTestVC.h"
#import 
 
@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