從Web下載和緩存圖片的Swift庫：Kingfisher

Kingfisher是一個輕量級和純Swift實現的用于從Web下載和緩存圖片的庫。這個項目源于 SDWebImage，它讓你可以在你的下一個項目中使用純Swift代替實現。

特性

• Everything in Kingfisher goes asynchronously, not only downloading, but also caching. That means you can never worry about blocking your UI thread.
• Multiple-layer cache. Downloaded image will be cached in both memory and disk. So there is no need to download it again and this could boost your app dramatically.
• Cache management. You can set the max duration or size the cache could take. And the cache will also be cleaned automatically to prevent taking too much resource.
• Modern framework. Kingfisher usesNSURLSessionand the latest technology of GCD, which makes it a strong and swift framework. It also provides you easy APIs to use.
• Cancellable processing task. You can cancel the downloading or retriving image process if it is not needed anymore.
• Independent components. You can use the downloader or caching system separately. Or even create your own cache based on Kingfisher's code.
• Options to decompress the image in background before render it, which could improve the UI performance.
• A category overUIImageViewfor setting image from an URL directly.

項目主頁：http://www.baiduhome.net/lib/view/home/1429062199767