采用系统的更换头像方法，编辑时图片的最上方或者最下方总是无法拖到截取框中，故而自有自定义。自定义的方法有很多，按照与微信类似的，选中照片后推送到下一页，再点击截取，返回头像页时，状态栏会消失。下面是解决办法，特此记录一下：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
//获取原始图片---不允许系统裁剪，采用自定义裁剪
    UIImage *img = [info objectForKey:UIImagePickerControllerOriginalImage];
 UIImage *portraitImg = ;//处理图片大小的方法

//自定义截取图片的控制器
BYPhotoInterceptionVC *photoInterceptionVC = [[BYPhotoInterceptionVC alloc]init。。。。。];
    photoInterceptionVC.delegate = self;

//推送到自定义截取的控制器
 [picker pushViewController: photoInterceptionVC animated:YES];

}

//判断是不是相机，如果是显示状态栏，并设置状态栏的Style
#pragma mark - UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    if ([navigationController isKindOfClass:[UIImagePickerController class]] &&
        ((UIImagePickerController *)navigationController).sourceType == UIImagePickerControllerSourceTypeCamera) {
        [[UIApplication sharedApplication] setStatusBarHidden:NO];
        [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent animated:NO];
    }
}