swift 实现在 iTunes中文件分享，并进行异常捕获处理

屏幕快照 2017-09-19 14.57.56.png

1.注意字符串的拼接

2.write file to url 结果 passed URL no scheme 解决方法 ：

/var/containers/Bundle/Application/509FDAEA-090F-4CF0-B40F-5F3BA7586216/ZBPlayer.app/text.txt
在路径前门添加 "file://"

3. 异常捕获 do try catch

4. 在iTunes中打开documentDirectory : 在info.plist 中添加 Application supports iTunes file sharing

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  enum DogError :Error {
        case NameInvalidError
        case AgeInvalidError
        case NameLengthError
    }
  

    override func viewDidLoad() {
        super.viewDidLoad()
   
         let content = "hahahaha"
        let documentPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask,true)
        var strPath = "/text.txt"
        strPath =  "file://" + documentPath[0]  + strPath
        let url =  URL.init(string: strPath)

        //异常捕获 方法一
        do {
          try   content.write(to: url!, atomically: true, encoding: .utf8)
        }
        catch{
            print(error)
        }
        
         //异常捕获 方法二
        guard (try?   content.write(to: url!, atomically: true, encoding: .utf8)) != nil
            else {

            return
        }

    }