swift之网络下载图片sdwebImage、Kingfisher、Nuke

参考：https://www.jianshu.com/p/55bbfbdf78de

=============方法一：使用sdwebImage

下载地址：https://github.com/rs/SDWebImage

在桥接文件中导入

#import <SDWebImage/UIImageView+WebCache.h>

let imagev:UIImageView=UIImageView.init(frame:CGRect(x:0,y:0,width:100,height:100))

view .addSubview(imagev)

imagev.sd_setImage(with: NSURL.init(string: "http://test.ahwofu.com/public/upload/ad/2018/01-13/abc1cc5d2e661e4a")! as URL, placeholderImage: UIImage.init(named: "bannerhomeOne"), options: [], progress: nil, completed:nil)

==============方法二：Kingfisher

下载地址：https://github.com/onevcat/Kingfisher

Kingfisher是一个开源处理图片加载、缓存的开源库;

Kingfisher 有如下特性：

异步：使用Kingfisher操作的所有事件都是异步的，包括下载、检索、缓存，你无须担心UI线程阻塞问题

多级缓存：下载的图片可以缓存至内存和Disk，如果你重新下载相同的图片，多级缓存将会显著的加快你得到结果

Mordern Framework：Kingfisher使用的是NSURLSession 以及最新的GCD，让你更方便的使用

可取消的任务：你可以取消你不想下载的任何任务

独立的组件：你可以单独的使用Downloader，也可以单独的使用Cache来创建你独立的多级缓存

UI显示提升：在后台线程解压缩你的图片

Extensions：提供了UIImageView与UIButton的扩展，方便你可以通过URL来显示你的图片

图片缓存ImageCache 使用：
ImageChache 给你提供了多级缓存，可以使用内存、磁盘存储，还提供了存储、检索、清除图片、移除等操作，如果你需要监听到磁盘的变化可以通过KingfisherDidCleanDiskCacheNotification添加通知。

 //缓存的一些设置func kfishsetcache(imageview:UIImageView,urlstr:String){let cacheKey:String="mycache"// ImageCache，默认是let cache = ImageCache.default//内存默认的缓存限制，最多存储内存大小的四分之一，图片个数无限制// 内存缓存大小，限制在300Mcache.memoryStorage.config.totalCostLimit = 300 * 1024 * 1024//缓存图片的个数最多150个cache.memoryStorage.config.countLimit = 150// 磁盘存储大小的限制1000Mcache.diskStorage.config.sizeLimit =  1000 * 1024 * 1024//内存中缓存默认的过期时间是5分钟，磁盘是一周过期//设置内现存过期时间是600秒cache.memoryStorage.config.expiration = .seconds(600)/*设置磁盘过期是永远不过期.never 永不过期.expired 立马过期，等于不存储days()date()seconds()*/cache.diskStorage.config.expiration = .never//专门为某一张图片设置过期时间let url=URL.init(string: urlstr)imageview.kf.setImage(with: url, options: [.memoryCacheExpiration(.never)])//每隔30秒清除一次缓存,这个貌似现在不好使
//        cache.memoryStorage.config.cleanInterval = 30let processor = RoundCornerImageProcessor(cornerRadius: 20)imageview.kf.setImage(with: url, options: [.processor(processor)])//判断是否有叫cacheKey名字的缓存cache.isCached(forKey: cacheKey, processorIdentifier: processor.identifier)//获取缓存的类型，是内存缓存或者磁盘缓存，无缓存let cacheType = cache.imageCachedType(forKey: cacheKey)//默认情况下会自动缓存//自己操作缓存let data: Data = urlstr.data(using: String.Encoding.utf8)!let image: UIImage = UIImage.init(named: urlstr)!cache.store(image, forKey: cacheKey)cache.store(image, original: data, forKey: cacheKey)//带有identify的cachelet mycache = ImageCache(name: "my-own-cache")imageview.kf.setImage(with: url, options: [.targetCache(mycache)])//获取缓存数据cache.retrieveImage(forKey: "cacheKey") { result inswitch result {case .success(let value):print(value.cacheType)// If the `cacheType is `.none`, `image` will be `nil`.print(value.image)case .failure(let error):print(error)}}//移除缓存ImageCache.default.removeImage(forKey: cacheKey)let processor1 = RoundCornerImageProcessor(cornerRadius: 20)cache.removeImage(forKey: cacheKey,processorIdentifier: processor1.identifier,fromMemory: false,fromDisk: true){print("Removed!")}// Remove all.cache.clearMemoryCache()cache.clearDiskCache { print("Done") }// Remove only expired.cache.cleanExpiredMemoryCache()cache.cleanExpiredDiskCache { print("Done") }//计算磁盘缓存的大小ImageCache.default.calculateDiskStorageSize { result inswitch result {case .success(let size):print("Disk cache size: \(Double(size) / 1024 / 1024) MB")case .failure(let error):print(error)}}// 监听数据移除NotificationCenter.default.addObserver(self, selector:#selector(cleanDiskCache), name: NSNotification.Name.init("KingfisherDidCleanDiskCacheNotification"), object:nil)}

==========下载图片带进度

使用ImageDownloader下载图片，它为我们提供了一些头的设置（比如说你有些图片是需要认证用户才能下载的）；安全设置：我们在下载图片时哪些Host是可信任的；下载超时设置；下载回调等

  /*带进度，可取消的下载使用：let imagev:UIImageView=UIImageView.init(frame:CGRect(x:0,y:50,width:100,height:100))view.addSubview(imagev)LYBKingfisherDownloadExample.init().kfishdownloadprogress(imageview:
imagev, urlstr: "https://bkimg.cdn.bcebos.com/pic/c2cec3fdfc039245b3888b558e94a4c27d1e25ae?x-bce-
process=image/resize,m_lfit,w_268,limit_1/format,f_jpg")*/func kfishdownloadprogress(imageview:UIImageView,urlstr:String){//设置下载器let downloader = ImageDownloader.default// 设置可信任的Host//        let hosts: Set<String> = ["http://xxxxx.com","http://#####.com"]//        downloader.trustedHosts = hosts// 设置sessionConfigurationdownloader.sessionConfiguration = URLSessionConfiguration.default// 设置代理，详情参考 ImageDownloaderDelegatedownloader.delegate = self// 下载超时设置downloader.downloadTimeout = 20// 下载图片let url=URL.init(string:urlstr)let retriveTask = downloader.downloadImage(with: url!, options:nil) { (nowsize, total) inprint("nowsize\(nowsize)---\(total)")} completionHandler: { (result) inprint("result-\(result)")switch result {case .success:imageview.image=try! result.get().imagecase .failure:break}}//        // 取消下载//        retriveTask?.cancel()}

=====下载不带缓存===

 //下载图片不带缓存func dowloadwithoutcache(imageview:UIImageView,urlstr:String){let url=URL.init(string:urlstr)let downloader = ImageDownloader.defaultdownloader.downloadImage(with: url!) { result inswitch result {case .success(let value):print(value.image)case .failure(let error):print(error)}}}

=====================直接imageview扩展下载设置图片

在File.swift文件中全局引入@_exported import Kingfisher

引入import Kingfisher

extension UIImageView{/*普通下载let imagev:UIImageView=UIImageView.init(frame:CGRect(x:0,y:50,width:100,height:100))view.addSubview(imagev)UIImageView.kfishdownload(imageview: imagev,urlstr: "https://bkimg.cdn.bcebos.com/pic/c2cec3fdfc039245b3888b558e94a4c27d1e25ae?x-bce-process=image/resize,m_lfit,w_268,limit_1/format,f_jpg")*/class func kfishdownload(imageview:UIImageView,urlstr:String,placeholdimagename:String){imageview.kf.setImage(with:ImageResource(downloadURL:URL.init(string:urlstr)!))//或者let url=URL.init(string:urlstr)imageview.kf.setImage(with: url, placeholder: UIImage.init(named: placeholdimagename))}}

============主控制器KingfisherManager配置

KingfisherManager是连接ImageDownloader与ImageCache的，所以你可以通过manager得到 downloader与cache，并且还能改设置加载选项，当然你也可以设置其他的ImageDownloader与ImageCache到你的Manager。

/*配置*/class  func kfishManager(imageview:UIImageView,urlstr:String){let kfManager = KingfisherManager.sharedlet newCache:ImageCache?// 通过manager 获取cachenewCache = kfManager.cache// 通过manager 获取downloaderlet newDownloader:ImageDownloader?newDownloader = kfManager.downloader// 设置options, 你可以设置你的newCache/newDownloader以及其他配置kfManager.defaultOptions = [.targetCache(newCache!), .downloader(newDownloader!), .forceRefresh, .backgroundDecode, .onlyFromCache, .downloadPriority(1.0)]let url=URL.init(string:urlstr)// 检索(retrieve取回)let resource = ImageResource(downloadURL:url!, cacheKey:"text")let retriveImageTask = kfManager.retrieveImage(with: resource, options:[]) { (nowsize, total) in//} downloadTaskUpdated: { (downloadtask) in//} completionHandler: { (result) inprint("\(result)")switch result {case .success:imageview.image=try! result.get().imagecase .failure:break}}//   取消下载//   retriveImageTask!.cancel()}

=====链式调用下载图片====

extension UIImageView{//链式调用class  func kfishdownloadchain(imageview:UIImageView,urlstr:String){let url = URL(string: urlstr)let placeholderImage:UIImage=UIImage.init(named: "center")!//Processor种类很多let processor = RoundCornerImageProcessor(cornerRadius: 20)let lowResolutionURL=URL.init(string: urlstr)KF.url(url!).placeholder(placeholderImage).setProcessor(processor).loadDiskFileSynchronously().cacheMemoryOnly().fade(duration: 0.25).lowDataModeSource(.network(lowResolutionURL!)).onProgress { receivedSize, totalSize in  }.onSuccess { result in  }.onFailure { error in }.set(to: imageview)}
}

=====一些设置======

    /*一些设置*/class  func kfdownloadwithsomesetting(imageview:UIImageView,urlstr:String){let url = URL(string: urlstr)
//处理器let processor = DownsamplingImageProcessor(size: imageview.bounds.size)|> RoundCornerImageProcessor(cornerRadius: 20)imageview.kf.indicatorType = .activityimageview.kf.setImage(with: url,placeholder: UIImage(named: "center"),options: [.processor(processor),.scaleFactor(UIScreen.main.scale),.transition(.fade(1)),.cacheOriginalImage]){result inswitch result {case .success://        imageview.image=value.imageimageview.image=try! result.get().imagecase .failure(let error):print("Job failed: \(error.localizedDescription)")}}}

=====下载之前改变request===

  //下载之前改变requestclass   func kfishdownloadmodifyrewuest(imageview:UIImageView,urlstr:String){let downloader = ImageDownloader.defaultlet url = URL(string: urlstr)let modifier = AnyModifier { request invar r = requestr.setValue("abc", forHTTPHeaderField: "Access-Token")return r}downloader.downloadImage(with: url!, options: [.requestModifier(modifier)]) {result inprint("\(result)")}imageview.kf.setImage(with: url, options: [.requestModifier(modifier)])}

====下载带超时====

 //下载带超时class func downloadtimeout(imageview:UIImageView,urlstr:String){let downloader = ImageDownloader.defaultdownloader.downloadTimeout=60//超时60秒let url = URL(string: urlstr)let modifier = AnyModifier { request invar r = requestr.timeoutInterval = 60return r}downloader.downloadImage(with: url!, options: [.requestModifier(modifier)])}

====处理器processor的设置===

 //processor处理下载的图片func kfishdownloadwithprocessor(imageview:UIImageView,urlstr:String){let url = URL(string: urlstr)// Round cornerlet processor = RoundCornerImageProcessor(cornerRadius: 20)//        // Downsampling
//        let processor2 = DownsamplingImageProcessor(size: CGSize(width: 100, height: 100))
//
//        // Cropping
//        let processor3 = CroppingImageProcessor(size: CGSize(width: 100, height: 100), anchor: CGPoint(x: 0.5, y: 0.5))
//
//        // Blur
//        let processor4 = BlurImageProcessor(blurRadius: 5.0)
//
//        // Overlay with a color & fraction
//        let processor5 = OverlayImageProcessor(overlay: .red, fraction: 0.7)
//
//        // Tint with a color
//        let processor6 = TintImageProcessor(tint: .blue)
//
//        // Adjust color
//        let processor7 = ColorControlsProcessor(brightness: 1.0, contrast: 0.7, saturation: 1.1, inputEV: 0.7)
//
//        // Black & White
//        let processor8 = BlackWhiteProcessor()
//
//        // Blend (iOS)
//        let processor9 = BlendImageProcessor(blendMode: .darken, alpha: 1.0, backgroundColor: .lightGray)
//        //复合处理器
//        let processor10 = BlurImageProcessor(blurRadius: 4) |> RoundCornerImageProcessor(cornerRadius: 20)// Use the process in view extension methods.imageview.kf.setImage(with: url, options: [.processor(processor)])}

====本地下载====

  //从本地下载class func kfishsdownloadfromfile(imageview:UIImageView,path:String){let url = URL(fileURLWithPath: path)let provider = LocalFileImageDataProvider(fileURL: url)let processor = RoundCornerImageProcessor(cornerRadius: 20)imageview.kf.setImage(with: provider, options: [.processor(processor)])}//从本地下载class func kfishsdownloadfrombase64String(imageview:UIImageView,base64Sting:String){let provider = Base64ImageDataProvider(base64String: base64Sting, cacheKey: "some-cache-key")imageview.kf.setImage(with: provider)}//从本地下载class func kfishsdownloadfromAVAsset(imageview:UIImageView,urlstr:String){let provider = AVAssetImageDataProvider(assetURL: URL(string: "https://example.com/your_video.mp4")!,seconds: 15.0)imageview.kf.setImage(with: provider)}

================扩展

Kingfisher 提供了UIButton与UIImageView的扩展，使你可以通过直接设置图片URL来显示，两者用法差不多，以UIImageView为例：

// 设置网络图片

imageView.kf.setImage(with: ImageResource(downloadURL: imageURL!))

imageView.kf.setImage(with: ImageResource(downloadURL: imageURL!), placeholder:UIImage(named: "test"), options:nil, progressBlock: nil, completionHandler: nil)

// UIImageView 也可以设置取消加载 (两种方式）

imageView.kf.cancelDownloadTask()

let retriveImageTask = imageView.kf.setImage(with:ImageResource(downloadURL: imageURL!))

retriveImageTask.cancel()

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