iOS指纹识别

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

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillResignActive:)
                                                 name:UIApplicationWillResignActiveNotification object:nil]; //监听是否触发home键挂起程序.
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidBecomeActive:)
                                                 name:UIApplicationDidBecomeActiveNotification object:nil]; //监听是否重新进入程序程序.
    
    return YES;
}

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

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    
    [self initTouchIDBtn];
}

//=============指纹识别==================
-(void)initTouchIDBtn{
    UIButton *touchIDBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    touchIDBtn.frame = CGRectMake(50, 300, 60, 40);
    [touchIDBtn setTitle:@"指纹" forState:UIControlStateNormal];
    [touchIDBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [touchIDBtn addTarget:self action:@selector(OnTouchIDBtn:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:touchIDBtn];
}

-(void)OnTouchIDBtn:(UIButton *)sender{
    if ([[UIDevice currentDevice].systemVersion floatValue] < 8.0) {
        NSLog(@"不支持指纹识别");
        return;
    }else{
        LAContext *ctx = [[LAContext alloc] init];
        if ([ctx canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:nil]) {
            NSLog(@"支持");
            [ctx evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"指纹识别" reply:^(BOOL success, NSError * error) {
                if (success) {
                    NSLog(@"识别成功");
                }else{
                    NSLog(@"识别失败");
                }
            }];
        }
    }
}