从我的网络服务我得到多个大小的图像。我在TableView中加载它们。当我加载新的图像时,这些图像在占位符和原始图像之间尚未缓存,或者有时图像看起来比通常的尺寸小。但只是向下或向上滚动实际上解决了问题,但我希望它们从一开始就是原始大小。但是,从下次我想,它会以原始形状出现,因为图片已经被缓存了
首先
稍微滚动
我在cellForRowAtIndexPath中的代码:
[cell.image sd_setImageWithURL:[NSURL URLWithString:[NSMutableString stringWithFormat:@"%@app/media/access/pictures?p=%@",baseurl,data.picPath]]
placeholderImage:[UIImage imageNamed: @"image_loader.gif"]];
然后在heightForRowAtIndexPath:
NSURL *filePath = [NSURL URLWithString:[NSMutableString stringWithFormat:@"%@app/media/access/pictures?p=%@",baseurl,data.picPath]];
NSString *key = [[SDWebImageManager sharedManager] cacheKeyForURL:filePath];
UIImage *image = [[SDImageCache sharedImageCache] imageFromDiskCacheForKey:key];
self.img = image;
if (self.img.size.width > CGRectGetWidth(self.view.bounds)) {
CGFloat ratio = self.img.size.height / self.img.size.width;
return CGRectGetWidth(self.view.bounds) * ratio+140;
} else {
return self.img.size.height+180;
}
我已经访问了https://github.com/rs/SDWebImage,在他们的常见问题部分他们已经提到过这个问题,但建议的解决方案并不适合我!
答案 0 :(得分:0)
实际上我做了什么,我检查了图像是否已经缓存,如果没有,我已经在heightForRowAtIndexPath下异步下载了它:
if(image != NULL)
{
self.img = image;
}
else
{
SDWebImageDownloader *downloader = [SDWebImageDownloader sharedDownloader];
[downloader downloadImageWithURL:filePath
options:0
progress:^(NSInteger receivedSize, NSInteger expectedSize) {
// progression tracking code
}
completed:^(UIImage *image, NSData *data, NSError *error, BOOL finished) {
if (image && finished) {
// do something with image
self.img = image;
}
}];
}