1、首先配置项目plist
（1）添加 View controller-based status bar appearance，并设置为NO
（2）添加 Status bar is initially hidden，并设置为YES
2、在UIImagePickerController使用的 ViewController中添加 navigationController： willShowViewController： animated：方法
- UIImagePickerController* imagePicker = [[UIImagePickerController alloc] init];
- imagePicker.delegate = self;
- - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
- {
- [[UIApplication sharedApplication] setStatusBarHidden:YES];
- }