• PIImageCache is an asynchronous image downloader with memory + disk caching
• This memory cache is LRU cache, configurable size.
• This disk cache can delete old files, on your controlled timing.
• Useful extensions. (UIImageView and NSURL)
• Written by Swift.

• PIImageCacheは、非同期な画像のダウンロード、インメモリキャッシュ、ディスクキャッシュを提供します。
• インメモリキャッシュはLRUCacheで、上限サイズは変更できます。
• ディスクキャッシュは、一定期間経過した古いファイルを削除する方式です。
• UIImageViewとNSURLにextensionを提供します。
• Swift製です。

install

step1

• manually
  • add PIImageCache.swift into your project
  • add PIImageCacheExtensions.swift into your project

• cocoapods
  • add “ pod ‘PIImageCache’, '1.0.0’ ” into your Podfile
  • add “ import PIImageCache ” into your code

step2

• add this into your ViewController

override func didReceiveMemoryWarning() {
  PIImageCache.shared.allMemoryCacheDelete()
}

step3

• add this into your AppDelegate

func applicationDidEnterBackground(application: UIApplication) {
  PIImageCache.shared.oldDiskCacheDelete()
}

basic usage

NSURL extension

let url = NSURL(string: "http://place-hold.it/200x200")!
let image = url.getImageWithCache()

UIImageView extension

let url = NSURL(string: "http://place-hold.it/200x200")!
let imgView = UIImageView()
imgView.imageOfURL(url)

download

let url = NSURL(string: "http://place-hold.it/200x200")!
let cache = PIImageCache.shared
image = cache.get(url)!

advanced usage

prefetch (download to disk cache)

let url = NSURL(string: "http://place-hold.it/200x200")!
let cache = PIImageCache.shared
cache.prefetch(url)

downloadWithId

set id, callback image with the id.

useful for UITableViewCell

// example: code in cellForRowAtIndexPath
let url = NSURL(string: "http://lorempixel.com/200/200/" )!
let id = indexPath.row
cell.id = indexPath.row
PIImageCache.shared.getWithId(url, id: i) {
  [weak self] id, image in
  if id == cell.id {
    cell.icon.image = image
  }
}

configurable

let cache = PIImageCache.shared
var config = PIImageCache.Config()
config.maxMemorySum = 5
config.limitByteSize = 100 * 1024 // 100kB
cache.setConfig(config)

let url = NSURL(string: "http://place-hold.it/200x200")!
let image = cache.get(url)!

• default values
  • maxMemorySum = 10 // 10 images
  • limitByteSize = 3 * 1024 * 1024 //3MB
  • usingDiskCache = true
  • diskCacheExpireMinutes = 24 * 60 // 1 day
  • prefetchOprationCount = 5
  • cacheRootDirectory = NSTemporaryDirectory()
  • cacheFolderName = “PIImageCache”