Switch之iCloud的使用（NSUbiquitousKeyValueStore）（三）

• 判断iCloud是否可用

    func isIcloudAvailable() -> Bool{
        if FileManager.default.ubiquityIdentityToken != nil{
            return true
        } else {
            return false
        }
    }

•  获取默认的NSUbiquitousKeyValueStore

 let kvoStore = NSUbiquitousKeyValueStore.default

•  设置数据

        //        NSUbiquitousKeyValueStore的使用方式和NSUserDefaults类似，可以存贮字符串，布尔值，整数，浮点数等
        kvoStore.set("liu", forKey: "name")
        kvoStore.set(26, forKey: "age")
        kvoStore.synchronize()//// 同步数据，避免冲突

•  获取数据

        kvoStore.string(forKey: "name")
        kvoStore.object(forKey: "age")

• 监听值的变化

        NotificationCenter.default.addObserver(self, selector: #selector(dataChanged(noti:)), name: NSUbiquitousKeyValueStore.didChangeExternallyNotification, object: nil)
    @objc func dataChanged(noti:Notification){
        print(noti.userInfo)
    }
    //千万不能忘记了在这里移除通知
    deinit {
        NotificationCenter.default.removeObserver(self)
    }

判断云文件夹是否存在

    let fileManager = FileManager()
    var documentDirectory:String?
    
    //判断文件是否存在
    func doesDocumentDirectoryExist()->Bool{
        var isDirectory = false as ObjCBool
        if let directory = documentDirectory{
            if fileManager.fileExists(atPath: directory, isDirectory: &isDirectory){
                if isDirectory.boolValue{
                    return true
                }
            }
        }
        return false
    }
    func createDocumentDirectory(){
        if let directory = documentDirectory{
            do{
                try  fileManager.createDirectory(at: NSURL.init(fileURLWithPath: directory) as URL, withIntermediateDirectories: true, attributes: nil)
            }catch{
                
            }
        }
    }
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        let containerUrl = fileManager.url(forUbiquityContainerIdentifier: nil)
        documentDirectory = containerUrl!.path + "\Documents"
        if doesDocumentDirectoryExist() {
            print("已经存在了")
        }else{
            createDocumentDirectory()
        }
        
        return true
    }