ios – 为ALAssetRepresentation元数据方法报告崩溃

我有一些代码包装从ALAssetLibrary中枚举资产中检索的ALAsset对象.我收到用户遇到崩溃的报告,该部分包装对象要求其包含的元数据的ALAsset.

崩溃的代码是在这个包装类中,它只是要求它的ALAsset的元数据,如下所示：

[[myAlAsset defaultRepresentation] Metadata];

这是一个部分堆栈跟踪,代表我看到的崩溃：

0
CoreFoundation   CFDataGetBytePtr + 5
1
PhotoLibraryservices     __46-[PLManagedAsset adjustmentsXMPRepresentation]_block_invoke + 228
2
PhotoLibraryservices     __46-[PLManagedAsset adjustmentsXMPRepresentation]_block_invoke + 228
3
CoreData     developerSubmittedBlockToNsmanagedObjectContextPerform + 88
4
CoreData     -[NsmanagedObjectContext performBlockAndWait:] + 114
5
PhotoLibraryservices     -[PLManagedAsset adjustmentsXMPRepresentation] + 226
6
AssetsLibrary    __33-[ALAssetRepresentation Metadata]_block_invoke + 24
7
AssetsLibrary    __53-[ALAssetRepresentationPrivate _performBlockAndWait:]_block_invoke + 68
8
CoreData     developerSubmittedBlockToNsmanagedObjectContextPerform + 88
9
libdispatch.dylib    _dispatch_client_callout + 22
10
libdispatch.dylib    _dispatch_barrier_sync_f_invoke + 26
11
CoreData     -[NsmanagedObjectContext performBlockAndWait:] + 106
12
AssetsLibrary    -[ALAssetsLibrary _performBlockAndWait:] + 134
13
AssetsLibrary    -[ALAssetRepresentationPrivate _performBlockAndWait:] + 176
14
AssetsLibrary    -[ALAssetRepresentation Metadata] + 464

有人有什么想法可能会发生什么？以这些资产为基础的AlAssetLibrary保存为静态引用,因此不应该在内存中进行清理,因此我不会指望ALAsset已被无效.这个问题似乎已经开始专门针对iOS 7发布了.

崩溃本身是EXC_BAD_ACCESS,KERN_INVALID_ADDRESS为0x0.