- setItem:(CustomItem *)item
{
_item = item;
// 占位图片
UIImage *placeholder = [UIImage imageNamed:@"placeholderImage"];
// 从内存\沙盒缓存中获得原图
UIImage *originalImage = [[SDImageCache sharedImageCache] imageFromDiskCacheForKey:item.originalImage];
if(originalImage) {// 如果内存\沙盒缓存有原图，那么就直接显示原图（不管现在是什么网络状态）
[self.imageView sd_setImageWithURL:[NSURL URLWithString:item.originalImage] placeholderImage:placeholder];
}else{// 内存\沙盒缓存没有原图
AFNetworkReachabilityManager *mgr = [AFNetworkReachabilityManager sharedManager];
if(mgr.isReachableViaWiFi) {// 在使用Wifi, 下载原图
[self.imageView sd_setImageWithURL:[NSURL URLWithString:item.originalImage] placeholderImage:placeholder];
}elseif(mgr.isReachableViaWWAN) {// 在使用手机自带网络
// 用户的配置项假设利用NSUserDefaults存储到了沙盒中
// [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"alwaysDownloadOriginalImage"];
// [[NSUserDefaults standardUserDefaults] synchronize];
#warning 从沙盒中读取用户的配置项：在3G\4G环境是否仍然下载原图
BOOL alwaysDownloadOriginalImage = [[NSUserDefaults standardUserDefaults] boolForKey:@"alwaysDownloadOriginalImage"];
if(alwaysDownloadOriginalImage) {// 下载原图
[self.imageView sd_setImageWithURL:[NSURL URLWithString:item.originalImage] placeholderImage:placeholder];
}else{// 下载小图
[self.imageView sd_setImageWithURL:[NSURL URLWithString:item.thumbnailImage] placeholderImage:placeholder];
}
}else{// 没有网络
UIImage *thumbnailImage = [[SDImageCache sharedImageCache] imageFromDiskCacheForKey:item.thumbnailImage];
if(thumbnailImage) {// 内存\沙盒缓存中有小图
[self.imageView sd_setImageWithURL:[NSURL URLWithString:item.thumbnailImage] placeholderImage:placeholder];
}else{
[self.imageView sd_setImageWithURL:nil placeholderImage:placeholder];
}
}
}
}
