iOS 指纹解锁验证TouchID功能

#import <LocalAuthentication/LocalAuthentication.h>

//iOS8.0后才支持指纹识别接口  if ([UIDevice currentDevice].systemVersion.floatValue < 8.0) {    return;  }

- (void)evaluateAuthenticate{  //创建LAContext  LAContext* context = [[LAContext alloc] init];  NSError* error = nil;  NSString* result = @"请验证已有指纹";  //首先使用canEvaluatePolicy 判断设备支持状态  if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {    //支持指纹验证    [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:result reply:^(BOOL success, NSError *error) {      if (success) {        //验证成功，主线程处理UI      }      else      {        NSLog(@"%@",error.localizedDescription);        switch (error.code) {          case LAErrorSystemCancel:          {            //系统取消授权，如其他APP切入            break;          }          case LAErrorUserCancel:          {            //用户取消验证Touch ID            break;          }          case LAErrorAuthenticationFailed:          {            //授权失败            break;          }          case LAErrorPasscodeNotSet:          {            //系统未设置密码            break;          }          case LAErrorTouchIDNotAvailable:          {            //设备Touch ID不可用，例如未打开            break;          }          case LAErrorTouchIDNotEnrolled:          {            //设备Touch ID不可用，用户未录入            break;          }          case LAErrorUserFallback:          {            [[NSOperationQueue mainQueue] addOperationWithBlock:^{              //用户选择输入密码，切换主线程处理            }];            break;          }          default:          {            [[NSOperationQueue mainQueue] addOperationWithBlock:^{              //其他情况，切换主线程处理            }];            break;          }        }      }    }];  }  else  {    //不支持指纹识别，LOG出错误详情    NSLog(@"不支持指纹识别");    switch (error.code) {      case LAErrorTouchIDNotEnrolled:      {        NSLog(@"TouchID is not enrolled");        break;      }      case LAErrorPasscodeNotSet:      {        NSLog(@"A passcode has not been set");        break;      }      default:      {        NSLog(@"TouchID not available");        break;      }    }    NSLog(@"%@",error.localizedDescription);  }}