#import <LocalAuthentication/LocalAuthentication.h>

LAContext *lacontext = [[LAContext alloc]init];  // 判斷設備是否支持指紋識別  BOOL isSupport = [lacontext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:NULL];  if(!isSupport)  {    NSLog(@"不支持！");    return;  }  [lacontext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"請按下手印" reply:^(BOOL success, NSError *error) {    if(success)    {      NSLog(@"成功后，處理接下來的邏輯");    }  }];

if ([UIDevice currentDevice].systemVersion.floatValue < 8.0) {    NSLog(@"不支持");    return;  }  LAContext *ctx = [[LAContext alloc] init];  // 判斷設備是否支持指紋識別  if ([ctx canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:NULL]) {    NSLog(@"支持");    // 輸入指紋，異步    // 提示：指紋識別只是判斷當前用戶是否是手機的主人！程序原本的邏輯不會受到任何的干擾！    [ctx evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"指紋登錄" reply:^(BOOL success, NSError *error) {      if (success) {        // 登錄成功        // TODO        NSLog(@"登陸成功");      }    }];  } else {    NSLog(@"不支持");  }