UIImagePickerController委托警告？

Question

设置选择器视图的委托时，我收到此警告：

 UIImagePickerController *pickerLibrary = [[UIImagePickerController alloc] init];
    pickerLibrary.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    pickerLibrary.delegate = self;
    [self presentViewController:pickerLibrary animated:YES completion:nil];



warning : assigning to <UIImagePickerControllerDelegate,UINavigationBarDelegate> from incompatible type "photoBrowser(my class name) 

我已向代表注册：

@interface PhotoBrowser : UIViewController <UIImagePickerControllerDelegate,UINavigationBarDelegate>

也试过：

@interface PhotoBrowser : UIImagePickerController <UIImagePickerControllerDelegate,UINavigationBarDelegate>

1 - 错误不会消失..

2-我如何以及何时要求用户许可？我在某种程度上找不到一个简单的指南来打开这个库并选择图像。

Answer 1

是不是UINavigationControllerDelegate而不是UINavigationBarDelegate？

当您尝试打开图像选择器时，iOS系统会自动处理询问用户的权限事项。它会显示一个警告弹出窗口。