iOS缓存Swift框架 – Mattress

项目介绍：

项目简介
Mattress是一个将整个web页面储存到磁盘缓存中的Swift框架，不同于NSURLCache，但是两者可以共同作用。这对更快的预缓存Web组件，以及使Web组件可用于脱机浏览，都是十分有用的。

安装

Mattress包含一个CommonCrypto的封装，所以你可以在Swift中很方便的使用。你要保证Mattress和CommonCrypto框架都include到你的项目中。

Carthage（推荐）

首先需要安装Carthag e： Homebrew

$ brew update
$ brew install carthage
之后可将本项目添加到你的Carfile中

github “buzzfeed/Mattress” >= 1.0.0
然后你需要用Carthage建立，手动将Mattress和CommonCrypto框架集成到你的项目中。

$ carthage build
CocoaPods

首先使用RubyGems安装CocoaPods

$ gem install cocoapods
安装之后将该项目添加到Podfile

pod ‘Mattress’, ‘~> 1.0.0’
使用方法

首先要创建一个URLCache实例，在你的 application:didFinishLaunching: method 中将它设置为你的应用程序的共享缓存。

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

let kB = 1024
let MB = 1024 * kB
let GB = 1024 * MB
let isOfflineHandler: (() -> Bool) = {
    // This is for demonstration only.
    // You should use Reachability or your preferred method to determine offline status
    // and return a proper value here.
    return false
}
let urlCache = Mattress.URLCache(memoryCapacity: 20 * MB, diskCapacity: 20 * MB, diskPath: nil,
    mattressDiskCapacity: 1 * GB, mattressDiskPath: nil, mattressSearchPathDirectory: .DocumentDirectory,
    isOfflineHandler: isOfflineHandler)

NSURLCache.setSharedURLCache(urlCache)
return true

}
为了在Mattress磁盘缓存中缓存一个网页，简单的调用URLCache的 diskCacheURL:loadedHandler: method。

NSLog(“Caching page”)
let urlToCache = NSURL(string: “https://www.google.com”)
if let

cache = NSURLCache.sharedURLCache() as? Mattress.URLCache,
urlToCache = urlToCache

{

cache.diskCacheURL(urlToCache, loadedHandler: { (webView) -> (Bool) in
        /*
           Note: The below code should work for fairly simple pages. However, if the page you are
           attempting to cache contains progressively / lazily loaded images or other assets you
           will also need to trigger any JavaScript functions here to mimic user actions and
           ensure those assets are also loaded before returning true.
        */
        let state = webView.stringByEvaluatingJavaScriptFromString("document.readyState")
        if state == "complete" {
            // Loading is done once we've returned true
            return true
        }
        return false
    }, completeHandler: { () -> Void in
        NSLog("Finished caching")
    }, failureHandler: { (error) -> Void in
        NSLog("Error caching: %@", error)
})

}
缓存成功之后，你可以在一个UIWebView中简单的加载，它可以从Mattress缓存中加载，就像魔法一样。

github地址:https://github.com/buzzfeed/mattress