swift 学习笔记（1）--- 运行环境

1. 下载xcode6 beta版

链接: http://pan.baidu.com/s/1o6kFu0U 密码: i7mm

大家不要怕，xcode 5 和xcode 6 是可以共存的。

 

2.  创建共存

1. Choose File > New > Project > (iOS or OS X) > Application > your template of choice.

此处选择 Single view Application。

      2. Click the Language pop-up menu and choose Swift

　　3. 上代码：   一样的用法，只不过语法不一样

　　4.  运行okay

 

class XHNewsTableViewController : UITableViewController {

    var dataSource = []

    

    var thumbQueue = NSOperationQueue()

    

    let hackerNewsApiUrl = "http://qingbin.sinaapp.com/api/lists?ntype=%E5%9B%BE%E7%89%87&pageNo=1&pagePer=10&list.htm"

    

    override func awakeFromNib() {

        super.awakeFromNib()

    }

    

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

        

        let refreshControl = UIRefreshControl()

        refreshControl.attributedTitle = NSAttributedString(string: "下拉刷新")

        refreshControl.addTarget(self, action: "loadDataSource", forControlEvents: UIControlEvents.ValueChanged)

        self.refreshControl = refreshControl

    }

    

    override func viewDidAppear(animated: Bool) {

        super.viewDidAppear(animated)

        loadDataSource();

    }

    

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

    

    func loadDataSource() {

        self.refreshControl.beginRefreshing()

        var loadURL = NSURL.URLWithString(hackerNewsApiUrl)

        var request = NSURLRequest(URL: loadURL)

        var loadDataSourceQueue = NSOperationQueue();

        

        NSURLConnection.sendAsynchronousRequest(request, queue: loadDataSourceQueue, completionHandler: { response, data, error in

            if error {

                println(error)

                dispatch_async(dispatch_get_main_queue(), {

                    self.refreshControl.endRefreshing()

                    })

            } else {

                let json = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary

                let newsDataSource = json["item"] as NSArray

                dispatch_async(dispatch_get_main_queue(), {

                    self.dataSource = newsDataSource

                    self.tableView.reloadData()

                    self.refreshControl.endRefreshing()

                    })

            }

            })

    }

    

    // #pragma mark - Segues

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

        if segue.identifier == "showWebDetail" {

//            let indexPath = self.tableView.indexPathForSelectedRow()

//            let object = dataSource[indexPath.row] as NSDictionary

//            (segue.destinationViewController as XHWebViewDetailController).detailID = object["id"] as NSInteger

        }

    }



    

    // #pragma mark - Table View

    

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {

        return 1

    }

    

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

        return dataSource.count

    }

    

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

        let cell = tableView.dequeueReusableCellWithIdentifier("XHNewsCell", forIndexPath: indexPath) as UITableViewCell

        

        let object = dataSource[indexPath.row] as NSDictionary

        

        cell.textLabel.text = object["title"] as String

        cell.detailTextLabel.text = object["id"] as String

        cell.imageView.image = UIImage(named :"cell_photo_default_small")

        cell.imageView.contentMode = UIViewContentMode.ScaleAspectFit

        

        let request = NSURLRequest(URL :NSURL.URLWithString(object["thumb"] as String))

        NSURLConnection.sendAsynchronousRequest(request, queue: thumbQueue, completionHandler: { response, data, error in

            if error {

                println(error)

                

            } else {

                let image = UIImage.init(data :data)

                dispatch_async(dispatch_get_main_queue(), {

                    cell.imageView.image = image

                    })

            }

            })

        

        

        return cell

    }

    

    override func tableView(tableView: UITableView!, heightForRowAtIndexPath indexPath: NSIndexPath!) -> CGFloat {

        return 80

    }

    

}