使用AssetsLibrary框架iPhone访问图书馆中的视频? [英] Accessing Videos in library using AssetsLibrary framework iPhone?

问题描述

我正在尝试在以下代码的帮助下使用AssetsLibrary Framework访问iPhone库中的视频...但是当我运行该应用程序时，代码无法正常工作...数组资产仍然为空?我在做什么错了?

I am trying to access videos in iPhone library using AssetsLibrary Framework with the help of following code...but when I run the application the code is not working...the array assets is still empty? What am I doing wrong?

顺便说一下，我的iPhone是将3G升级到iPhone 4.1的方式.(但是资产框架没有出现任何错误)

by the way my iPhone is a 3G upgraded to iPhone 4.1.(but assets framework is not giving any error)

NSMutableArray *assets = [[NSMutableArray alloc]init];
ALAssetsLibrary *library = [[ALAssetsLibrary alloc]init];

void (^assetEnumerator)(struct ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop) {
        if(result != NULL) {
                NSLog(@"See Asset: %@", result);
                [assets addObject:result];
            }
        };

    void (^assetGroupEnumerator)(struct ALAssetsGroup *, BOOL *) =  ^(ALAssetsGroup *group, BOOL *stop) {
        if(group != nil) {NSLog(@"dont See Asset: ");
                [group enumerateAssetsUsingBlock:assetEnumerator];
            }
        };

    assets = [[NSMutableArray alloc] init];
    library = [[ALAssetsLibrary alloc] init];
    [library enumerateGroupsWithTypes:ALAssetsGroupAlbum
                           usingBlock:assetGroupEnumerator
                         failureBlock: ^(NSError *error) {
                                 NSLog(@"Failure");
                             }];

推荐答案

4.1升级似乎已经破坏"了某些图像选择器示例，请注意以下几行，这些行在您发布的代码之后运行:

the 4.1 upgrade seems to have 'broken' some of the image picker examples, observe the following lines, which run after the code you have posted:

NSUInteger groupTypes = ALAssetsGroupAlbum | ALAssetsGroupEvent | ALAssetsGroupFaces;
[assetsLibrary enumerateGroupsWithTypes:groupTypes usingBlock:listGroupBlock failureBlock:failureBlock];

这在我的4.1 iPhone和模拟器上都提供了零资产.但是，更改groupTypes会有所帮助，因此设置

This gives zero assets both on my 4.1 iPhone and simulator. However changing the groupTypes helps, so set

 NSUInteger groupTypes = ALAssetsGroupAll;

，您应该开始看到一些资产.

and you should start seeing some assets.

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