1.cmd+k 键盘toggle 
2.模拟器的handware设置ios键盘 
 
3.设置textfield的return类型为搜索 
k.returnKeyType=UIReturnKeyType.search 
 
4.uiswitch 
 
    @IBOutlet weak var rightswitch: UISwitch! 
    @IBOutlet weak var leftswitch: UISwitch! 
    @IBAction func switchValueChange(_ sender: Any) { 
         
        var s = sender as! UISwitch 
         
        var setting = s.isOn 
        leftswitch.setOn(setting, animated: true) 
        rightswitch.setOn(setting, animated: true) 
         
    } 
5. UISegmentedControl 
 
 @IBAction func touchDown(_ sender: Any) { 
        let seg = sender as! UISegmentedControl 
        print("段:",seg.selectedSegmentIndex) 
    } 
 
6.UISlider 
 
  @IBAction func sliderValueChange(_ sender: Any) { 
         
        var slider = sender as! UISlider 
         
        let p = Int(slider.value) 
        print(p) 
    } 
 
7. 加载html网页，可以实现代理方法 
 
     
    var webView:UIWebView! 
     
    override func viewDidLoad() { 
        super.viewDidLoad() 
         
         
        self.webView = UIWebView.init(frame: self.view.bounds) 
        self.view.addSubview(self.webView) 
         
        let url:NSURL = NSURL.init(string: "https://www.baidu.com")! 
         
        let req  = NSURLRequest.init(url: url as URL) 
        webView.loadRequest(req as URLRequest) 
    } 
 
8. IOS默认弹窗 
@IBAction func click(_ sender: Any) { 
        let a = UIAlertController.init(title: "title", message: "msg", preferredStyle: .alert) 
         
        let noAction = UIAlertAction.init(title: "取消", style: .cancel) { (p) in 
            print("取消啦") 
        } 
         
        let yesAction = UIAlertAction.init(title: "确认", style: .default) { (p) in 
            print("ok啦") 
        } 
        //假如只有一个的话,添加一个就可以了 
        a.addAction(noAction) 
         
         
        a.addAction(yesAction) 
        present(a, animated: true) { 
            print("点了某个了") 
        } 
    } 
 
9.UINavigationController中有是个stack ,可以push一些 vc,有3个子的东西,分别是navigationBar(顶部导航条)和navigationItem(顶部导航条的内容)和title 
 
 
在子视图中可以通过navigationController访问导航控制器，同时可以通过navigationController的childViewControllers获得当前栈中所有的子视图（注意每一个出栈的子视图都会被销毁） 
 
10.swift.sqlite 
http://blog.csdn.net/sps900608/article/details/51483738 
11.swift 桥接文件 
http://blog.csdn.net/qq_29284809/article/details/50977432