资产库框架在4.0和4.2上无法正常工作 [英] Assets Library Framework not working correctly on 4.0 and 4.2

问题描述

我尝试实现资源库并创建自定义图像选择器。具体来说，我正在尝试运行此处给出的代码： http://icodeblog.com/2010/10/07/cloning-uiimagepickercontroller-using-the-assets-library-framework/

I have tried to implement the Asset Library and create a Custom Image Picker. Specifically, I am trying to run the code given here: http://icodeblog.com/2010/10/07/cloning-uiimagepickercontroller-using-the-assets-library-framework/

代码在Simulator 4.1中运行得非常好但是当我尝试使用4.0或4.2时，它会卡在加载屏幕上，它会在GDB上给出以下评论：

The code runs perfectly well in Simulator 4.1 but when I try 4.0 or 4.2 it gets stuck on the Loading screen and it gives me the following comment on the GDB:

2010-11-16 16：37：27.514 ELCImagePickerDemo [49819：6b03]问题
发生

2010-11-16 16:37:27.514 ELCImagePickerDemo[49819:6b03] A problem occured

它来自代码中的这一行：

It's from this line in the code:

ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; 
[library enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:assetGroupEnumerator failureBlock:^(NSError *error) 
{ 
    NSLog(@"A problem occured"); 
}]; 

不知怎的，我无法弄清问题是什么。我已经添加了Asset Lib框架和所有内容。

Somehow I am not able to figure out what is the problem. I have added the Asset Lib framework and everything.

推荐答案

解决了这个问题，这是一个真正的破坏者！

Solved it, this was a real head breaker !

好的，所以我检查了苹果论坛，这个家伙发帖真的很有帮助：
https://devforums.apple.com/message/323036#323036

Ok so I checked the apple forum and this guys post really helped : https://devforums.apple.com/message/323036#323036

所以基本上assetGroupEnumerator在自己的线程上运行所以我只是将整个函数包含在dispatch_async（dispatch_get_main_queue（）中，它现在可以工作!!!

so basically assetGroupEnumerator runs on its own thread so I just enclosed the whole function in dispatch_async(dispatch_get_main_queue() and it works now !!!

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