25_Downloading An Image

一个App，从网上下载一张图片（给出图片地址），重新命名，然后保存到手机中，再从手机中取出显示在屏幕上。

难度不大，就是找图片很蛋疼，百度搜索出来的过一会儿会失效，Google搜索出来的有些需要翻墙，崩溃了。

还有一个是，Xcode由于可以自动补全，而某些方法名字很像，甚至三个单词以上组成的时候，只有中间某个单词不一样，于是就。。。

//
//  ViewController.swift
//  Downloading An Image
//
//  Created by zcdll on 16/1/23.
//  Copyright © 2016年 ZC. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var image: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        var documentsDirectory:String?

        var paths:[AnyObject] = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask,true)

        if paths.count > 0 {

            documentsDirectory = paths[0] as? String

            let savePath = documentsDirectory! + "/tam.jpg"

                self.image.image = UIImage(named: savePath)

        }

        /*
        let url = NSURL(string: "http://www.tiananmen.org.cn/capinfo_product/NC_Admin/NCAdm-Media/uploadFile/20029293142.jpg")

        let task = NSURLSession.sharedSession().dataTaskWithURL(url!) { (data, response, error) -> Void in

            if error != nil {

                print(error)

            } else {

                var documentsDirectory:String?

                var paths:[AnyObject] = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask,true)

                if paths.count > 0 {

                    documentsDirectory = paths[0] as? String

                    let savePath = documentsDirectory! + "/tam.jpg"

                    NSFileManager.defaultManager().createFileAtPath(savePath, contents: data, attributes: nil)

                    dispatch_async(dispatch_get_main_queue(), { () -> Void in

                            self.image.image = UIImage(named: savePath)

                    })

                }

                /*
                dispatch_async(dispatch_get_main_queue(), { () -> Void in

                    if let tiananmen = UIImage(data: data!) {

                        self.image.image = tiananmen

                    }

                })
                */
            }
        }

        task.resume()
        */

    }

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

}

项目：25_Downloading An Image