Beginning iOS 9 Programming with

1.control+command+"Space" 快速呼出表情筐

2.可以在Playground直接写UI代码：

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3.按住control在一个视图上自己拉到自己，可以添加aspect宽高比约束

4.Size Class对应iPhone

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5.“There are a number of tools for developers to prototype their apps. POP app, Proto.io, Flinto, Principle and InvisionApp are some of the examples. ”
https://popapp.in/
https://proto.io/
https://www.flinto.com/
http://www.invisionapp.com/
http://principleformac.com/

6.“tableView.deselectRowAtIndexPath(indexPath, animated: false)”

『7』. 导航栏

    UINavigationBar.appearance().barTintColor = UIColor(red: 242.0/255.0, green:
        116.0/255.0, blue: 119.0/255.0, alpha: 1.0)
    if let barFont = UIFont(name: "Avenir-Light", size: 24.0) {
            UINavigationBar.appearance().titleTextAttributes =
            [NSForegroundColorAttributeName:UIColor.whiteColor(),
            NSFontAttributeName:barFont]
    }
    UINavigationBar.appearance().tintColor = UIColor.whiteColor()

8.状态栏风格：

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    UIApplication.sharedApplication().statusBarStyle = .LightContent

9. iOS8之后出来的自动设置cell高度的技术，三步：
   tableView.estimatedRowHeight = 36.0
   tableView.rowHeight = UITableViewAutomaticDimension
   把label行数设置成0

10. exit

     先在controller里写@IBAction func close(segue:UIStoryboardSegue)     然后在链接按钮到exit！
    

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