Note 19 控件,手势,PickerView与AlertController

控件

一.都是继承UIControl ,可以addTarget()

forControlEvents: .ValueChanged
1.UISegmentedControl分段控件

提供单选能力
momentary(Bool) 是否记录状态

2.UISlide滑动条

maxmumValue/min....最大值,最小值
value 当前值
continuous 是否连续触发

3.Switch 开关

on (Bool) 是否是开启的状态

4.UIPageControl 分页
与上面的类似

二.PickerView :

与tableview类似

      let pickerView = UIPickerView(frame: CGRect(x: 0, y: 100, width: self.view.bounds.size.width, height: 200))
        pickerView.dataSource = self
        pickerView.delegate = self
        self.view.addSubview(pickerView)

pickerView:
1.pickerViewDatasource
func 多少comp
func 多少row
2.pickerViewDelegate
func title
func pickerView view可以重用

方法有的不是必须实现

    //列数
    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 3
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return 4
    }
    
//    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
//        return "a"
//    }
    
    //可以重用
    func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView {
        if let v = view {
            print("reusing")
            v.backgroundColor = UIColor.redColor()
            return v
        }
        else {
            print("no reuse")
            let greenView = UIView()
            greenView.backgroundColor = UIColor.greenColor()
            return greenView
        }
    }
    
    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        print("\(component): \(row)")
    }

UIDatePicker 与 pickerview类似,但是实现起来简单

        let datePicker = UIDatePicker(frame: CGRect(x: 0, y: 300, width: self.view.bounds.size.width, height: 200))
//        datePicker.datePickerMode = .Date
        datePicker.datePickerMode = .Time
        datePicker.addTarget(self, action: #selector(didChange(_:)), forControlEvents: .ValueChanged)
        self.view.addSubview(datePicker)
        
         func didChange(sender: UIDatePicker) {
        print(sender.date) //NSDate
    }

DatePick:
        let datePick = UIDatePicker(frame: CGRect(x: 0, y: 300, width: self.view.frame.width, height: 100))
        datePick.addTarget(self, action: #selector(didDate(_:)), forControlEvents: .ValueChanged)
        datePick.datePickerMode = .DateAndTime
        //.Time//时:分:上午/下午
        //.Date//日期:时:分//.DateAndTime
        //日期:时:分:上午/下午 
        //.CountDownTimer //小时:分钟

三.UIWebView

        let webView = UIWebView(frame: self.view.bounds)
        webView.delegate = self
        
//        let url = NSURL(string: "http://ifeng.com")
//        let request = NSURLRequest(URL: url!)
//        webView.loadRequest(request)
        
//        let htmlStr = "
这是一个标题
"
//        webView.loadHTMLString(htmlStr, baseURL: nil)
        
        //1. 加载本地网页
        let url = NSBundle.mainBundle().URLForResource("index", withExtension: "html")
//        let request = NSURLRequest(URL: url!)
//        webView.loadRequest(request)
        
        //2. 
        let data = NSData(contentsOfURL: url!)
        webView.loadData(data!, MIMEType: "text/html", textEncodingName: "utf-8", baseURL: NSURL())
        
        self.view.addSubview(webView)

    //1. 开始加载的时机
    //2. 可以过滤网址
    func webView(webView: UIWebView, shouldStartLoadWithRequest request: NSURLRequest, navigationType: UIWebViewNavigationType) -> Bool {
        let path = request.URL?.absoluteString
        
        print(path!)
        if path!.containsString("baidu.com") {
            return false
        }
        
        return true
    }
    
    func webViewDidStartLoad(webView: UIWebView) {
        //
    }
    
    func webViewDidFinishLoad(webView: UIWebView) {
        //如果需要操作网页，必须等加载完成
        let res = webView.stringByEvaluatingJavaScriptFromString("document.getElementsByTagName('img')")
        print(res)
        
        //w3school.com.cn
    }
    
    func webView(webView: UIWebView, didFailLoadWithError error: NSError?) {
        
    }

这个控件还没怎么使用暂时先mark下来

四UI( )GestureRecognizer

tap,screenEdgePanges,swipe,longPress等

        let tap = UITapGestureRecognizer(target: self, action: #selector(didTap(_:)))
        self.view.addGestureRecognizer(tap)
       
        let screenGes = UIScreenEdgePanGestureRecognizer(target: self, action: #selector(scGes(_:)))
        self.view.addGestureRecognizer(screenGes)
        screenGes.edges = UIRectEdge.Left
        
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(tap(_:)))
        self.view.addGestureRecognizer(tapGesture)
        
        let swipe1 = UISwipeGestureRecognizer(target: self, action: #selector(swipe01(_:)))
        swipe1.direction = .Down
        self.view.addGestureRecognizer(swipe1)
        
        let longPress = UILongPressGestureRecognizer(target: self, action: #selector(swipe02(_:)))
        self.view.addGestureRecognizer(longPress)

五UIAlertController

继承ViewController,也是一个页面,所以显示可以用present

        let alCtrl = UIAlertController(title: "警告", message: "别瞎点", preferredStyle: .Alert)
        let action1 = UIAlertAction(title: "返回", style: .Cancel) { (action) in
            let textfield = alCtrl.textFields![0]
            print(textfield.text)
        }
        alCtrl.addAction(action1)
        alCtrl.addTextFieldWithConfigurationHandler { (textf) in
        }
        self.presentViewController(alCtrl, animated: true, completion: nil)

AlertController页面里的输入框输入的文字可以通过Action的闭包传回来,这是使用输入文字的一个时机