如何使UIImagePickerController StatusBar lightContent风格？

当我呈现 UIImagePickerController 时状态栏文本颜色仍然是黑色，如何制作这样的？

只需三步：

1: Add UINavigationControllerDelegate,UIImagePickerControllerDelegate to your

@interface yourController ()<>

2: imagePickerController.delegate = self;

3:

-(void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
}