新增檔案 Create a New File

Purpose: 

探討如何以 Swift 建立新的檔案。

Code:


//
//  ViewController.swift
//  FileBuildUpDemo
//
//  Created by Elvis Meng on 2015/9/28.
//  Copyright © 2015年 Elvis Meng. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        let fileManager = NSFileManager.defaultManager()
        let directory = NSHomeDirectory().stringByAppendingString("Documents/data")
        do {
            try fileManager.createDirectoryAtPath(directory, 
                                                  withIntermediateDirectories: true, 
                                                  attributes: nil)
            print("directory build up success")
        }
        catch {
            print("directory build up fail")
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}


Test:



當 fileManager.createDirectoryAtPath(:directory, withIntermediateDirectories:, attributes:) 的 withIntermediateDirectories 設為 false 時，若此檔案已建立，則不覆蓋原有檔案：



後記:

新版本 Xcode 7.0 只支援 fileManager.createDirectoryAtPath(:directory, withIntermediateDirectories:, attributes:)，不支援 fileManager.createDirectoryAtPath(:directory, withIntermediateDirectories:, attributes:, error:)，且呼叫改採用 throws 方式來呼叫，即程式要用 do { try func XXX } catch { ... } 的語法。

參考:

1.NSFileManager, https://developer.apple.com/library/prerelease/watchos/documentation/Cocoa/Reference/Foundation/Classes/NSFileManager_Class/