在调用相机后idleTimerDisabled失效的问题

解决办法就是相机的完成或者取消代理中延时设置

- (void)resetIdleTimerDisabled
  {
      [[UIApplication sharedApplication] setIdleTimerDisabled:YES];
  }

  #pragma mark - UIImagePickerControllerDelegate

  - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
  {
      [self dismissViewControllerAnimated:YES completion:^{
          [self performSelector:@selector(resetIdleTimerDisabled) withObject:nil afterDelay:1.0];
      }];
  }

  - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
  {
      [self dismissViewControllerAnimated:YES completion:^{
          [self performSelector:@selector(resetIdleTimerDisabled) withObject:nil afterDelay:1.0];
      }];
  }