使用AssestsLibrary框架iPhone访问库中的视频？ [英] Accessing Videos in library using AssestsLibrary framework iPhone?

问题描述

我正在尝试使用AssetsLibrary框架在以下代码的帮助下访问iPhone库中的视频...但是当我运行应用程序时代码无效...数组资产仍然是空的？我做错了什么？

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??

顺便说一句我的iPhone是升级到iPhone 4.1的3G。（但资产框架没有给出任何错误）

btw 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升级似乎已破坏了一些图像选择器示例，请观察以下行，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和模拟器上都提供零资产。但是，更改groupTypes有帮助，所以设置

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.

这篇关于使用AssestsLibrary框架iPhone访问库中的视频？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！