修复UIImagePickerController偷换StatusBar颜色的问题

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
// bug fixes: UIIMagePickerController使用中偷换StatusBar颜色的问题
if ([navigationController isKindOfClass:[UIImagePickerController class]] &&
((UIImagePickerController *)navigationController).sourceType ==     UIImagePickerControllerSourceTypePhotoLibrary) {
[[UIApplication sharedApplication] setStatusBarHidden:NO];
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent animated:NO];
}
}