1、UILabel的創建

1.1、Label基本應用

1）label的基本應用
代碼示例：

 //1.UILabel的基本屬性
        let normalLabel = UILabel.init()
        //1.1 frame
        normalLabel.frame = CGRect(x: 10, y: 50, width: 250, height: 50)
        //1.2 backgroundColor
        normalLabel.backgroundColor = UIColor(red: 0.3,green: 0.5,blue: 0.5,alpha: 1)
        //1.3 textAlignment
        normalLabel.textAlignment = .Center
        //1.4 lineBreakMode(每行斷行的方式)
        normalLabel.lineBreakMode = .ByWordWrapping
        //1.5 font
        normalLabel.font = UIFont.systemFontOfSize(25)
        //1.6 text
        normalLabel.text = "This is a normalLabel";
        //1.7 textColor
        normalLabel.textColor = UIColor.blueColor()
        //1.8 添加到view
        view.addSubview(normalLabel)

2）帶有陰影效果的label
代碼示例：

//2.帶有陰影的Label
        let shadowLabel = UILabel.init(frame: CGRect(x: 10, y: 100, width: 300, height: 50))
        shadowLabel.text = "This is a shadowLabel"
        shadowLabel.textColor = UIColor.blackColor()
        //2.1 陰影顏色
        shadowLabel.shadowColor = UIColor.blueColor()
        //2.2 陰影的范圍
        shadowLabel.shadowOffset = CGSize(width: 1.0, height: 2.0)
        view.addSubview(shadowLabel)

3）帶有多屬性文本的label
代碼示例：

      //3 多屬性文本
        let mutableAttributeLabel = UILabel.init(frame: CGRect(x: 10, y:200, width: 300, height: 50))
        //3.1 設置多屬性字符串
        let attriStr = NSMutableAttributedString.init(string: "This is a  mutableAttributeLabel")
        //3.2 添加修改屬性的內容和位置(此處可以修改字體、文字顏色、陰影等)
        attriStr.addAttribute(NSFontAttributeName, value: UIFont.systemFontOfSize(25), range: NSMakeRange(0, 3))
        //3.3 highlighted
        mutableAttributeLabel.highlighted = true
        //3.4 highlightedTextColor
        mutableAttributeLabel.highlightedTextColor = UIColor.blackColor();
        mutableAttributeLabel.attributedText = attriStr
        view.addSubview(mutableAttributeLabel)

4）自適應高度的label
代碼示例：

//4.自適應高度的label
        let autoSizeLabel = UILabel.init()
        autoSizeLabel.frame = CGRect(x: 10, y: 300, width: 300, height: 0)
        autoSizeLabel.text = "This is a autoSizeLabel This is a autoSizeLabel This is a autoSizeLabel This is a autoSizeLabel This is a autoSizeLabel This is a autoSizeLabel"
        autoSizeLabel.textColor = UIColor.blackColor()
        //4.1 numberOfLines(此值為0說明label可以多行)
        autoSizeLabel.numberOfLines = 0
        autoSizeLabel.lineBreakMode = .ByCharWrapping
        //4.2.1自適應高度(此方法必須設置寬度的最大值)
//        var rect = CGRect()
//        let labelRect = CGRect(x: 50, y: 300, width: 300, height: 50)
//        rect = autoSizeLabel.textRectForBounds(labelRect, limitedToNumberOfLines: 0)
//        autoSizeLabel.frame = rect
        //4.2.2.自適應高度(推薦這種方法)
        autoSizeLabel.sizeToFit()
        view.addSubview(autoSizeLabel)

5）傾斜的label
代碼示例：

 //5.傾斜的label
        let obliqueLabel = UILabel.init(frame: CGRect(x: 10, y: 500, width: 200, height: 50))
        obliqueLabel.text = "This a obliqueLabel"
        //5.1 transform (rotation：傾斜)傾斜程度
        obliqueLabel.transform = CGAffineTransformMakeRotation(0.5)
        view.addSubview(obliqueLabel)

1.2 帶有菜單欄(UIMenuController)的Label

實現步驟：
1.將UILabel的userInteractionEnabled屬性設置為true
2.給UILabel添加手勢
代碼示例：

self.userInteractionEnabled = true
        self.addGestureRecognizer(UITapGestureRecognizer.init(target: self, action: #selector(labelDidTouch)))

3.使UILabel成為第一響應者并在手勢的響應事件中創建UIMenuController
4.自定義要顯示的MenuItem和相應的響應事件
代碼示例：

self.becomeFirstResponder()
let menuControl = UIMenuController.sharedMenuController()
//設置菜單里可見
menuControl.menuVisible = true
//添加菜單欄顯示的item
menuControl.menuItems = [
            UIMenuItem.init(title: "fork", action: #selector(forkFunc)),
            UIMenuItem.init(title: "star", action: #selector(starFunc)),
            UIMenuItem.init(title: "watch", action: #selector(watchFunc))
        ]
menuControl.setTargetRect(self.bounds, inView: self)

5.調用override func canPerformAction(action: Selector, withSender sender: AnyObject?) -> Bool函數來決定顯示的item

代碼示例：

let actionBool = (action == #selector(forkFunc))||(action == #selector(watchFunc))||(action == #selector(starFunc))
    if actionBool{
            return true
        }else{
            return false
        }

6.重寫override func canBecomeFirstResponder() -> Bool函數
代碼示例：

override func canBecomeFirstResponder() -> Bool {
       return true
       }

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