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iPhone ALAssetsLibrary 获取所有图像并进行编辑

发布于 2024-12-06 18:33:54 字数 98 浏览 3 评论 0原文

请帮助我解决我的问题：

我可以使用 ALAssetsLibrary 提供 iPhone 库中所有图像/视频的 URL 和元数据吗？我可以编辑/删除这些图片/视频吗？

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嗳卜坏 2024-12-13 18:33:54

上面的代码缺少一些大括号，因此在下面解决

ALAssetsLibrary *al = [[ALAssetsLibrary alloc] init];
assets = [[NSMutableArray alloc] init];
[al enumerateGroupsWithTypes:ALAssetsGroupAll

                  usingBlock:^(ALAssetsGroup *group, BOOL *stop)
 {
     [group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
      {
          if (asset)
          {  
               NSLog(@"%@",asset);  

              NSLog(@".. do something with the asset");    
          }
      }
      ];
 }

                         failureBlock:^(NSError *error)
      {
          // User did not allow access to library
         // .. handle error 
      }
      ] ;

the above code has missed some braces so it is resolved below

ALAssetsLibrary *al = [[ALAssetsLibrary alloc] init];
assets = [[NSMutableArray alloc] init];
[al enumerateGroupsWithTypes:ALAssetsGroupAll

                  usingBlock:^(ALAssetsGroup *group, BOOL *stop)
 {
     [group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
      {
          if (asset)
          {  
               NSLog(@"%@",asset);  

              NSLog(@".. do something with the asset");    
          }
      }
      ];
 }

                         failureBlock:^(NSError *error)
      {
          // User did not allow access to library
         // .. handle error 
      }
      ] ;

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凡尘雨 2024-12-13 18:33:54

查看 ALAssetsLibrary 的文档这里。要访问所有照片和视频，您需要枚举照片库中的所有组（相册），然后枚举每个组中的所有照片和图像。您无法使用 API 删除资产。 iOS 5 添加了额外的功能 - 但仍处于 NDA 状态，无法在此讨论 - 请查看 iOS5 的测试版文档和 Apple 开发者论坛。

您的代码需要执行以下操作：

ALAssetsLibrary *al = [[ALAssetsLibrary alloc] init];


[al enumerateGroupsWithTypes:ALAssetsGroupAll

    usingBlock:^(ALAssetsGroup *group, BOOL *stop)
    {
        [group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
        {
            if (asset)
            {                
                 .. do something with the asset
            }
        }
        ];
    }

    failureBlock:^(NSError *error)
    {
        // User did not allow access to library
        .. handle error 
    }
 ];

Take a look at the documentation for ALAssetsLibrary here. To access all photos and videos you need to enumerate all groups (albums) in the photo library and then enumerate all photos and images in each group. You cannot delete assets using the API. iOS 5 adds extra functionality - it's still under NDA though and cannot be discussed here - have a look at the beta documentation and Apple Developer forums for iOS5.

Your code will need to do something like this:

ALAssetsLibrary *al = [[ALAssetsLibrary alloc] init];


[al enumerateGroupsWithTypes:ALAssetsGroupAll

    usingBlock:^(ALAssetsGroup *group, BOOL *stop)
    {
        [group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
        {
            if (asset)
            {                
                 .. do something with the asset
            }
        }
        ];
    }

    failureBlock:^(NSError *error)
    {
        // User did not allow access to library
        .. handle error 
    }
 ];

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