如何使用 UIImagePickerController 从照片库中删除图像答案

【问题标题】：How to delete an image from photo library using UIImagePickerController如何使用 UIImagePickerController 从照片库中删除图像
【发布时间】：2016-05-02 05:48:01
【问题描述】：

我在我的应用程序中使用UIImagePickerController 来获取图像。在我的应用程序中拾取这张图片后，我需要从 iOS PhotoLibrary 中同步删除它。

- (BOOL)createAndInsertNewElementFromDictionary:(NSDictionary*)dict
{
AlbumElement *newElement;

if ([dict[UIImagePickerControllerMediaType]
     isEqualToString:(NSString*)kUTTypeMovie])
{
    NSURL *mediaUrl = dict[UIImagePickerControllerMediaURL];
    newElement = [AlbumElement createElementWithMediaUrl:mediaUrl
                                                 inAlbum:_album.name];

}
else if ([dict[UIImagePickerControllerMediaType]
          isEqualToString:(NSString*)kUTTypeImage])
{
    UIImage *image = [dict[UIImagePickerControllerOriginalImage] copy];
    newElement = [AlbumElement createElementWithImage:image
                                              inAlbum:_album.name];
}

if (newElement != nil)
{
    [_album.elements insertObject:newElement atIndex:0];

    UIImage *icon = [UIImage imageWithContentsOfFile:[newElement iconFullPath]];
    [AlbumElement writeImageToFileWithImage:icon
                                 atFullPath:_album.albumIconPath];
}
else
{
    NSLog(@"Element was NOT added!");
    return NO;
}

return YES;
}

【问题讨论】：

标签： ios objective-c iphone uiimagepickercontroller

【解决方案1】：

NSURL *url = [dict objectForKey:@"UIImagePickerControllerReferenceURL"] ;  

PHPhotoLibrary *library = [PHPhotoLibrary sharedPhotoLibrary];
 [library performChanges:^{
// Here assetsURLs is array of url's you want to delete 
    PHFetchResult *assetsToBeDeleted = [PHAsset fetchAssetsWithALAssetURLs:[NSArray arrayWithObject:url] options:nil];
    [PHAssetChangeRequest deleteAssets:assetsToBeDeleted];
} completionHandler:^(BOOL success, NSError *error)
 {
     // Check error and success here
}];

【讨论】：

嗨，谢谢它对我来说很好用。但是删除照片时会显示消息。如何修改该消息。
这是确认消息，默认情况下来自苹果的这种方法你不能隐藏它。如果我找到另一种方法，我会分享。欲了解更多信息，请查看此链接stackoverflow.com/questions/31922796/…
是否可以从照片库中选择多张图片。
默认没有，但您可以通过 3rd 方库将其作为github.com/w5mith/WSAssetPickerController
如果您使用相机拍摄图像，则不会保存在照片库中。

【解决方案2】：

你可以这样做，

 -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{


NSURL *imgURL = info[UIImagePickerControllerReferenceURL];

[[PHPhotoLibrary sharedPhotoLibrary]performChanges:^{


    PHAsset *imageAssetTodelete = [PHAsset fetchAssetsWithALAssetURLs:imgURL options:nil];

    [PHAssetChangeRequest deleteAssets:imageAssetTodelete];


} completionHandler:^(BOOL success, NSError * _Nullable error) {

    if (error) {

        NSLog(@"err description : %@",[error localizedDescription]);
    }
    if (success) {

        NSLog(@"image deleted successfully");
    }


}];

 }

别忘了在课堂上@import Photos;。

希望这会有所帮助:)

【讨论】：

【解决方案3】：

我使用与#MOHAMMAD ISHAQ 相同的代码，但在我的情况下它不起作用，图片没有被删除，我没有任何错误。请问有什么帮助或建议吗？

PHAsset *asset = nil;
PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init];
fetchOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];
PHFetchResult *fetchResult = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:fetchOptions];
if (fetchResult != nil && fetchResult.count > 0) {
    // get last photo from Photos
    asset = [fetchResult lastObject];
}

if (asset) {
    
    PHContentEditingInputRequestOptions *editOptions = [[PHContentEditingInputRequestOptions alloc] init];

    [asset requestContentEditingInputWithOptions:editOptions completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {

        if (contentEditingInput.fullSizeImageURL) {
            //do something with contentEditingInput.fullSizeImageURL
            
            NSLog(@"¨PATH %@",contentEditingInput.fullSizeImageURL);
            
            NSMutableArray *persons = [[NSMutableArray alloc]initWithCapacity:0];
            [persons addObject:contentEditingInput.fullSizeImageURL];
            
            NSArray *myArray = [[NSArray alloc]initWithArray:persons];
            
            PHPhotoLibrary *library = [PHPhotoLibrary sharedPhotoLibrary];
          
            [library performChanges:^{
               
    
                PHFetchResult *assetsToBeDeleted = [PHAsset fetchAssetsWithALAssetURLs:myArray options:nil];
       
                [PHAssetChangeRequest deleteAssets:assetsToBeDeleted];
            } completionHandler:^(BOOL success, NSError *error)
             {
                 //do something here
                NSLog(@"DELETE IAMGE");
            }];
        }

    }];

谢谢

【讨论】：