import UIKitclass ViewController: UIViewController {    override func viewDidLoad() {        super.viewDidLoad()                var documentsPath:String = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true).first!        documentsPath = documentsPath.stringByAppendingString("/video.mov")        print("\(documentsPath)")                let nsdata:NSData = NSData(contentsOfURL:NSURL(string: "http://api.k780.com:88/?app=qr.get&data=test&level=L&size=6")!)!        do {                        try nsdata.writeToFile(documentsPath, options: .AtomicWrite)        }catch{                        print("写入失败")        }                if DirectoryExistAtPath(documentsPath) {            print("file Exist")        }else {            print("file notExist!")        }    }    func DirectoryExistAtPath(path:String)->Bool {        return NSFileManager.defaultManager().fileExistsAtPath(path)    }