Swift 学习笔记——文件操作

将 字符串 写入文件

        var str  = "hello world !!!"

        str.writeToFile("/Users/huaijie/hellotest.txt", atomically: false, encoding: NSUTF8StringEncoding, error: nil)

从文件中读取内容

        let content = String(contentsOfFile: "/Users/huaijie/hellotest.txt", encoding: NSUTF8StringEncoding, error: nil)

        print(content!)

从文件中读取二进制数据

        let mydata = NSData(contentsOfFile: "/Users/huaijie/hellotest.txt");

        let nsdata =  NSString(data: mydata!, encoding: NSUTF8StringEncoding)

        print(nsdata!)

判断文件是否存在

        var bool = NSFileManager().fileExistsAtPath("/Users/huaijie/hellotest.txt")

        println(bool)

查找文件

        var path = NSBundle.mainBundle().pathForResource("test", ofType: "txt")

        println(path)

根据动态用户名查找文件

        if let dirs = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true) as? [String]{

            let path = dirs[0].stringByAppendingPathComponent("file.txt")

            println(path)

        }

在Mac上打开文件选择对话框

    let openPanel = NSOpenPanel()

        

    openPanel.allowsMultipleSelection = false

        openPanel.canChooseDirectories = false

        openPanel.canCreateDirectories = false

        openPanel.canChooseFiles = true

        

        openPanel.beginWithCompletionHandler{(result)-> Void in

            if result == NSFileHandlingPanelOKButton{

                print(openPanel.URL)

            }

        }