Swift实现带有缓存的播放器

来源：互联网发布：编程珠玑第3版 pdf 编辑：程序博客网时间：2024/06/06 14:03

用到的第三方库:
Alamofire 用于网络请求和视频下载
MobilePlayer 用于播放在线视频

创建Movie类:

import Foundationimport Alamofireclass Movie {    private var url: NSURL //网络路径 如果本地路径存在则是本地路径    init (url: NSURL) {        self.url = url    }    //获取播放路径    func getUrl() -> NSURL {        if isExist() {            let url = NSURL(fileURLWithPath: getFilePath())            return url        }        return self.url    }    //通知下载 如果已经存在 不下载    func postDownload() {        if isExist() {            return        }        let destination = Alamofire.Request.suggestedDownloadDestination()        Alamofire.download(.GET, url, destination: destination).response { _, _, _, error in            if let error = error {                print("Failed with error: \(error)")            } else {                print("Downloaded file successfully")            }        }    }    //是否已经下载    private func isExist() -> Bool{        let fileManager = NSFileManager.defaultManager()        let filePath = getFilePath()        print(filePath)        let exist = fileManager.fileExistsAtPath(filePath)        return exist    }    //通过文件名称 获取文件路径    private func getFilePath() -> String {        let filePath = NSHomeDirectory() + "/Documents/" + getFileName()        return filePath    }    //通过url 获取文件名称    private func getFileName() -> String {        let array = self.url.URLString.componentsSeparatedByString("/")        return array.last!    }}

创建Movie对象:

let string = "视频路径"let url = NSURL(string: string)!let movie = Movie(url: url)movie.postDownload() //下载play(movie)//播放

播放方法:

import MobilePlayerfunc play(movie: Movie) {    let url = movie.getUrl()    let playerVC = MobilePlayerViewController(contentURL: url)    playerVC.activityItems = [url]    presentMoviePlayerViewControllerAnimated(playerVC)}

一边播放一遍下载，下载成功后会播放本地路径的视频。

清除所有缓存:

//清除所有缓存func cleanAllCache() {    let fileManager = NSFileManager.defaultManager()    let myDirectory = NSHomeDirectory() + "/Documents"    let fileArray:[AnyObject]? = fileManager.subpathsAtPath(myDirectory)    for fn in fileArray!{        try! fileManager.removeItemAtPath(myDirectory + "/\(fn)")    }}

这里是用的是Alamofire设置的下载路径，注意删除的路径要和下载的路径一致。

//获取所有缓存大小    func getAllCacheSize() -> String {        let fileManager = NSFileManager.defaultManager()        let myDirectory = NSHomeDirectory() + "/Documents"        let fileArray:[AnyObject]? = fileManager.subpathsAtPath(myDirectory)        var allSize = 0.0        for fn in fileArray!{            let attr = try! fileManager.attributesOfItemAtPath(myDirectory + "/\(fn)")            let size = (attr["NSFileSize"] as! Double) / 1000000 //单位为 M            allSize += size        }        return String(format: "%.1f", allSize) //保留小数点后一位    }

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