图片大小调整和简单的缓存iOS库：GDRSImageCache
jopen
11年前
GDRSImageCache就一个简单的缓存和图片大小调整iOS库。通过一个 URL 该库会通过后台线程获取图片并在内存中缓存。 GDRSImageCache提供一个过滤模块，会将从获取的图片进行调整，然后再进行缓存。
以下是GDRSImageCache的一个典型用法：
UIImageView *anImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 40, 40)]; // create the cache GDRSImageCache *cache = [[GDRSImageCache alloc] initWithCachedImageFilter:^UIImage *(UIImage *sourceImage) { // resize the image to the image view size and round the image corners; // this is called by the cache on a background thread return [sourceImage gdrs_resizedImageToAspectFitSize:anImageView.bounds.size cornerRadius:10]; }]; // set the default image, which will be returned from // fetchImageWithURL:completionHandler: if an image coresponding to the // requested url is not cached yet. cache.defaultImage = [UIImage imageNamed:<#place holder image name#>]; NSURL *imageUrl = <#an url to a image#>; // fetch an image; the call returns imidiatly and the callback handler // is called when the image is fetched over the network anImageView.image = [cache fetchImageWithURL:imageUrl completionHandler:^(UIImage *image, NSError *error) { anImageView.image = image; }];