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要訪問和修改用戶的照片庫,可以使用UIImagePickerController類和UIImagePickerDelegate協(xié)議。以下是一個簡單的示例代碼,演示如何訪問用戶的照片庫并顯示選定的圖片:
// 在視圖控制器中創(chuàng)建一個UIImagePickerController屬性
@property (nonatomic, strong) UIImagePickerController *imagePickerController;
// 實例化UIImagePickerController并設(shè)置代理
self.imagePickerController = [[UIImagePickerController alloc] init];
self.imagePickerController.delegate = self;
// 設(shè)置UIImagePickerController的sourceType為UIImagePickerControllerSourceTypePhotoLibrary,以訪問用戶的照片庫
self.imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
// 顯示UIImagePickerController
[self presentViewController:self.imagePickerController animated:YES completion:nil];
// 實現(xiàn)UIImagePickerDelegate協(xié)議方法,處理用戶選擇的圖片
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info {
UIImage *selectedImage = info[UIImagePickerControllerOriginalImage];
// 在這里可以對選定的圖片進(jìn)行處理或保存到本地
// 關(guān)閉UIImagePickerController
[picker dismissViewControllerAnimated:YES completion:nil];
}
// 實現(xiàn)UIImagePickerDelegate協(xié)議方法,處理用戶取消選擇
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
// 關(guān)閉UIImagePickerController
[picker dismissViewControllerAnimated:YES completion:nil];
}
這段代碼演示了如何訪問用戶的照片庫并顯示選定的圖片。您可以在didFinishPickingMediaWithInfo
方法中對選定的圖片進(jìn)行處理,例如顯示在UIImageView中,保存到本地等操作。在imagePickerControllerDidCancel
方法中處理用戶取消選擇的情況。
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