相关疑难解决方法(0)

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 …

当我只在主线程上执行以下操作时iref立即自动释放:

-(void)loadImage:(ALAsset*)asset{
    @autoreleasepool {
        ALAssetRepresentation* rep = [asset defaultRepresentation];
        CGImageRef iref = [rep fullScreenImage];
        UIImage* image = [UIImage imageWithCGImage:iref
                                             scale:[rep scale]
                                       orientation:UIImageOrientationUp];

        [self.imageView setImage:image];
    }
}

但是当我执行imageWithCGImage时:在后台线程上使用GCD iref不会像第一个例子那样立即释放.大约一分钟后:

-(void)loadImage:(ALAsset*)asset{

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void) {
        @autoreleasepool {
            ALAssetRepresentation* rep = [asset defaultRepresentation];
            CGImageRef iref = [rep fullScreenImage];
            UIImage* image = [UIImage imageWithCGImage:iref
                                                 scale:[rep scale]
                                           orientation:UIImageOrientationUp];

            dispatch_async(dispatch_get_main_queue(), ^(void) {
                [self.imageView setImage:image];
            });
        }
    });
}

如何CGImageRef立即释放对象？

之前的研究:

• 当我用它记录时,泄漏仪器不显示任何泄漏.
• 分配工具表明,一个CGImageRef物体已被分配,并且在它应该被释放后仍然存活了大约一分钟.
• 如果我尝试手动释放CGImageRef对象,CGImageRelease我会在图像尝试自动释放一分钟后获得BAD_EXEC异常.
• 保留iref …