IOS 指纹识别两种方式详解及实例

#import <LocalAuthentication/LocalAuthentication.h>

LAContext *lacontext = [[LAContext alloc]init];  // 判断设备是否支持指纹识别  BOOL isSupport = [lacontext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:NULL];  if(!isSupport)  {    NSLog(@"不支持！");    return;  }  [lacontext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"请按下手印" reply:^(BOOL success, NSError *error) {    if(success)    {      NSLog(@"成功后，处理接下来的逻辑");    }  }];

if ([UIDevice currentDevice].systemVersion.floatValue < 8.0) {    NSLog(@"不支持");    return;  }  LAContext *ctx = [[LAContext alloc] init];  // 判断设备是否支持指纹识别  if ([ctx canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:NULL]) {    NSLog(@"支持");    // 输入指纹，异步    // 提示：指纹识别只是判断当前用户是否是手机的主人！程序原本的逻辑不会受到任何的干扰！    [ctx evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"指纹登录" reply:^(BOOL success, NSError *error) {      if (success) {        // 登录成功        // TODO        NSLog(@"登陆成功");      }    }];  } else {    NSLog(@"不支持");  }