ALAssetsLibrary invalid or null

问题

I get the following error message : invalid attempt to access <ALAssetPrivate: 0xa4a1ed0> past the lifetime of its owning ALAssetsLibrary when I try to create custom Image Picker.

I used this APPLE sample to create this app. The sample Apple app works perfectly. But when I copied that sample code to my app it get the above error message.

Please can someone help me why this error comes & ALAssetsGroup become null.

回答1:

I found the answer for this problem. The problem is my ALAssetsLibrary I used got null by ARC. The solution is, add this static method instead of ALAssets Library..

+ (ALAssetsLibrary *)defaultAssetsLibrary {
    static dispatch_once_t pred = 0;
    static ALAssetsLibrary *library = nil;
    dispatch_once(&pred, ^{
        library = [[ALAssetsLibrary alloc] init];
    });
    return library; 
}

Source

来源：https://stackoverflow.com/questions/22662464/alassetslibrary-invalid-or-null