从相机胶卷读取UIImage时内存分配大(内存泄漏？)的原因

Question

我尝试修改FGallery(https://github.com/gdavis/FGallery-iPhone).我需要它从相机胶卷读取图像,但我得到内存泄漏.

旧代码(路径是文件位置):

@autoreleasepool {

NSString *path = [NSString stringWithFormat:@"%@/%@", [[NSBundle mainBundle]   bundlePath],_thumbUrl];
_thumbnail = [UIImage imageWithContentsOfFile:path];
_hasThumbLoaded = YES;
_isThumbLoading = NO;
[self performSelectorOnMainThread:@selector(didLoadThumbnail) withObject:nil   waitUntilDone:YES];
}

我的代码(路径是断言库url):

@autoreleasepool {

ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset) {
   ALAssetRepresentation *rep = [myasset defaultRepresentation];
   CGImageRef iref = [rep fullResolutionImage];
   if (iref) {
       _thumbnail = [UIImage imageWithCGImage:iref];
       _hasThumbLoaded = YES;
       _isThumbLoading = NO;
       [self performSelectorOnMainThread:@selector(didLoadThumbnail) withObject:nil   waitUntilDone:YES];
   }
};        

ALAssetsLibraryAccessFailureBlock failureblock  = ^(NSError *myerror) {
   NSLog(@"booya, cant get image - %@",[myerror localizedDescription]);
};     

NSURL *asseturl = [NSURL URLWithString:_thumbUrl];
[assetslibrary assetForURL:asseturl 
resultBlock:resultblock
failureBlock:failureblock];
}
}

对于相同的图像,我得到一个大的内存分配(-didReceiveMemoryWarning),使我的代码中的程序崩溃,但不是在使用原始代码时.

有什么想法吗？

PS我使用ARC,并为FGallery做了自动转换.它适用于本地应用程序图像,但正如所说,我无法使其适用于相机胶卷图像.

编辑1:程序崩溃

Answer 1

我想我明白了."ALAssetsLibraryAssetForURLResultBlock resultblock"正在另一个线程上运行.因此"@autoreleasepool"不适用于它.(每个线程都有自己的自动释放池).因此,由于许多"自动释放"分配(图像),内存占用率要高得多.在块内添加"@autoreleasepool"可以阻止崩溃和大内存分配.

简而言之:

ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset) {
   @autoreleasepool {
      ALAssetRepresentation *rep = [myasset defaultRepresentation];
      CGImageRef iref = [rep fullResolutionImage];
      if (iref) {
          _thumbnail = [UIImage imageWithCGImage:iref];
          _hasThumbLoaded = YES;
          _isThumbLoading = NO;
          [self performSelectorOnMainThread:@selector(didLoadThumbnail) withObject:nil   waitUntilDone:YES];
       }
   }
}; 

感谢所有回复的人.