以下方法放在默认的全局队列中，以便从设备中获取一些照片。如果系统版本大于iOS 8，则使用ALAssetLibrary框架，否则使用dispatch_semaphore_t sema = dispatch_semaphore_create(0);
dispatch_async(dispatch_get_global_queue(0, 0), ^{
[self getPhotos:^(NSArray *photos) {
dispatch_semaphore_signal(sema);
}];
}
dispatch_time_t timeout = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(10 * NSEC_PER_SEC));
dispatch_semaphore_wait(sema, timeout);
- (void)getPhotos:(MyCallBack)callback {
Class PHPhotoLibrary_class = NSClassFromString(@"PHPhotoLibrary");
if (PHPhotoLibrary_class) {
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status != PHAuthorizationStatusAuthorized)
{
return;
}
PHFetchResult *smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil];
}
}
。
Exception Type: SIGTRAP
Exception Codes: TRAP_BRKPT at 0x190c41b60
Crashed Thread: 25
Thread 25 Crashed:
0 PhotoLibraryServices 0x0000000190c41b60 +[PLModelMigrator _validateCurrentModelVersionFailedWithNoVersionFromServer] :444 (in PhotoLibraryServices)
1 PhotoLibraryServices 0x0000000190c41ef8 +[PLModelMigrator _validateCurrentModelVersionAttempt:] :316 (in PhotoLibraryServices)
2 PhotoLibraryServices 0x0000000190c41ef8 +[PLModelMigrator _validateCurrentModelVersionAttempt:] :316 (in PhotoLibraryServices)
3 PhotoLibraryServices 0x0000000190c41ef8 +[PLModelMigrator _validateCurrentModelVersionAttempt:] :316 (in PhotoLibraryServices)
4 PhotoLibraryServices 0x0000000190c41ef8 +[PLModelMigrator _validateCurrentModelVersionAttempt:] :316 (in PhotoLibraryServices)
5 PhotoLibraryServices 0x0000000190c41ef8 +[PLModelMigrator _validateCurrentModelVersionAttempt:] :316 (in PhotoLibraryServices)
6 PhotoLibraryServices 0x0000000190c41ef8 +[PLModelMigrator _validateCurrentModelVersionAttempt:] :316 (in PhotoLibraryServices)
7 PhotoLibraryServices 0x0000000190c41ef8 +[PLModelMigrator _validateCurrentModelVersionAttempt:] :316 (in PhotoLibraryServices)
8 PhotoLibraryServices 0x0000000190c41ef8 +[PLModelMigrator _validateCurrentModelVersionAttempt:] :316 (in PhotoLibraryServices)
9 PhotoLibraryServices 0x0000000190c41ef8 +[PLModelMigrator _validateCurrentModelVersionAttempt:] :316 (in PhotoLibraryServices)
10 PhotoLibraryServices 0x0000000190c41ef8 +[PLModelMigrator _validateCurrentModelVersionAttempt:] :316 (in PhotoLibraryServices)
11 PhotoLibraryServices 0x0000000190c43688 +[PLModelMigrator createDatabase] :508 (in PhotoLibraryServices)
12 PhotoLibraryServices 0x0000000190b7c1cc -[PLPhotoLibrary loadDatabase:] :808 (in PhotoLibraryServices)
13 PhotoLibraryServices 0x0000000190b71f70 -[PLPhotoLibrary initWithTransientContext:name:] :560 (in PhotoLibraryServices)
14 Photos 0x0000000191722418 ___45-[PHPhotoLibrary backgroundQueuePhotoLibrary]_block_invoke :60 (in Photos)
15 libdispatch.dylib 0x0000000184bb21bc __dispatch_client_callout :16 (in libdispatch.dylib)
16 libdispatch.dylib 0x0000000184bb2fb0 _dispatch_once_f :56 (in libdispatch.dylib)
17 Photos 0x00000001917223d4 -[PHPhotoLibrary backgroundQueuePhotoLibrary] :156 (in Photos)
18 Photos 0x0000000191722604 -[PHPhotoLibrary photoLibraryForCurrentQueueQoS] :80 (in Photos)
19 Photos 0x0000000191722578 -[PHPhotoLibrary managedObjectContextForCurrentQueueQoS] :24 (in Photos)
20 Photos 0x00000001917611bc -[PHQuery _createFetchRequestIncludingBasePredicate:] :140 (in Photos)
21 Photos 0x0000000191761c5c -[PHQuery fetchRequest] :52 (in Photos)
22 Photos 0x0000000191783988 -[PHFetchResult initWithQuery:oids:registerIfNeeded:usingManagedObjectContext:] :376 (in Photos)
23 Photos 0x0000000191783c2c -[PHFetchResult initWithQuery:] :100 (in Photos)
24 Photos 0x0000000191763b5c -[PHQuery executeQuery] :52 (in Photos)
25 Photos 0x00000001916c2998 ___67+[PHAssetCollection fetchAssetCollectionsWithType:subtype:options:]_block_invoke :72 (in Photos)
26 Photos 0x000000019175fe48 +[PHObject authorizationAwareFetchResultWithOptions:fetchBlock:] :88 (in Photos)
27 Photos 0x00000001916c2944 +[PHAssetCollection fetchAssetCollectionsWithType:subtype:options:] :84 (in Photos)
应用程序崩溃，在64位设备上，如iPhone 5S和更新型号，堆栈跟踪就是这样。
Exception Type: SIGABRT
Exception Codes: #0 at 0x1b448ad4
Crashed Thread: 1
Application Specific Information:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException' reason: 'CoreData: Cannot load NSManagedObjectModel. nil is an illegal URL parameter'
Last Exception Backtrace:
0 CoreFoundation 0x1bca0df7 ___exceptionPreprocess :131 (in CoreFoundation)
1 libobjc.A.dylib 0x1af03077 _objc_exception_throw :39 (in libobjc.A.dylib)
2 CoreData 0x1dc190c5 +[NSManagedObjectContext initialize] :1 (in CoreData)
3 PhotoLibraryServices 0x256a45d5 ___44+[PLManagedObjectContext managedObjectModel]_block_invoke :89 (in PhotoLibraryServices)
4 AssetsLibraryServices 0x24fc527d ___pl_dispatch_once_block_invoke :19 (in AssetsLibraryServices)
5 libdispatch.dylib 0x1b346083 __dispatch_client_callout :23 (in libdispatch.dylib)
6 libdispatch.dylib 0x1b346c65 _dispatch_once_f :43 (in libdispatch.dylib)
7 AssetsLibraryServices 0x24fc5267 _pl_dispatch_once :77 (in AssetsLibraryServices)
8 PhotoLibraryServices 0x256a456d +[PLManagedObjectContext managedObjectModel] :73 (in PhotoLibraryServices)
9 Photos 0x26139475 +[PHQuery _relationshipForFetchType:predicate:] :257 (in Photos)
10 Photos 0x2613a4cd -[PHQuery collectionFetchType] :85 (in Photos)
11 Photos 0x261392b1 -[PHQuery copyWithZone:] :303 (in Photos)
12 Photos 0x26158239 -[PHFetchResult initWithQuery:oids:registerIfNeeded:usingManagedObjectContext:] :125 (in Photos)
13 Photos 0x26158567 -[PHFetchResult initWithQuery:] :81 (in Photos)
14 Photos 0x2613c0cb -[PHQuery executeQuery] :53 (in Photos)
15 Photos 0x260aaf4f ___67+[PHAssetCollection fetchAssetCollectionsWithType:subtype:options:]_block_invoke :73 (in Photos)
16 Photos 0x2613898d +[PHObject authorizationAwareFetchResultWithOptions:fetchBlock:] :63 (in Photos)
17 Photos 0x260aaf03 +[PHAssetCollection fetchAssetCollectionsWithType:subtype:options:] :97 (in Photos)
通常在32位设备上，如iPhone5，iPhone4S，崩溃报告是这样的：
AssetsLibraryServices这似乎是一个coredata错误，我也不明白为什么PhotoLibraryServices和/classes/groovy都存在于上一个崩溃报告中。我尝试了很多方法，但无法重现崩溃，感谢任何帮助。
答案 0 :(得分：3)
此处缺少一些内容，主要是您拨打If的上下文，我注意到您从未对getPhotos做任何事情或回电。也许你只是没有包含它，因为你认为它不相关。
无论如何，我创建了一个新项目（包括核心数据），这就是我所做的一切。没有崩溃的工作：
1）将smartAlbums添加到plist
2）将以下内容添加到NSPhotoLibraryUsageDescription：
AppDelegate.h 3）将#import <Photos/Photos.h>
typedef void (^MyCallBack)(NSArray *photos);
中的didFinishLaunchingWithOptions的默认实现替换为：
AppDelegate.m答案 1 :(得分：0)
根据我的经验，子线程中没有必要getPhotos或fetchAssetCollectionsWithType。试一试。