我正在使用AssetsLibrary开发照片库应用程序来加载我的设备照片。当在另一个VC中呈现随机图像时,我注意到以下情况:我的完整res图像需要大约1或2秒加载到imageView上(比原始photosApp长得多),我也从日志中获取“已接收”加载一些图像后的“内存警告”。如果我将我的表示设置为fullScreenImage,警告会停止,但我不想这样做。为了在视图上获得流畅的性能和高质量的图像,我必须改变什么?
这是代码,希望你能告诉我这是什么问题:
这是我希望在屏幕上显示图像的VC
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(@"%@",assetsController);
detailImageView = [[UIImageView alloc]initWithFrame:self.view.bounds];
[self.view addSubview:detailImageView];
detailImageView.image = smallImage; //small image is my asset thumbnail and is passed as an argument in my init function
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
ALAsset *asset = [assetsController.albumPics objectAtIndex:assetsController.index];
ALAssetRepresentation *representation = [asset defaultRepresentation];
bigImage = [[UIImage imageWithCGImage:[representation fullResolutionImage]]retain];
dispatch_async(dispatch_get_main_queue(), ^{
detailImageView.image = bigImage;
});
[pool release];
});
}
更新1
{
UIImageView *detailImageView = [[UIImageView alloc]initWithFrame:self.view.bounds];
[self.view addSubview:detailImageView];
detailImageView.image = smallImage;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
ALAsset *asset = [assetsController.albumPics objectAtIndex:assetsController.index];
ALAssetRepresentation *representation = [asset defaultRepresentation];
UIImage *bigImage = [UIImage imageWithCGImage:[representation fullResolutionImage]];
dispatch_async(dispatch_get_main_queue(), ^{
detailImageView.image = bigImage;
});
[pool release];
});
}
答案 0 :(得分:0)
bigImage
是实例变量吗?它是否用于除此之外的任何地方?如果它没有在其他任何地方使用,那么它应该是一个局部变量,你不应该保留它。如果它是您保留的实例变量,则需要在为其分配新值之前释放先前的值。
同样的讨论适用于detailImageView