iOS swift使用xib绘制UIView

目标：用xib绘制一个UIView，在某个ViewController中调用。

三个文件：ViewController.swift    DemoView.swift     DemoView.xib

首先，可以专心将DemoView.xib画出来，别忘记DemoView.xib中UIView的一处设置

然后，写DemoView.swift文件，代码如下：

class CoreView: UIView {

    //MARK:
    //MARK: properties

    @IBOutlet weak var makefriendsBtn: UIButton!
    @IBOutlet weak var networkBtn: UIButton!
    @IBOutlet weak var everyoneBtn: UIButton!

    //MARK:
    //MARK: constraints

    @IBOutlet weak var makefriendsBtnWidth: NSLayoutConstraint!
    @IBOutlet weak var networkBtnWidth: NSLayoutConstraint!
    @IBOutlet weak var everyoneBtnWidth: NSLayoutConstraint!

    //MARK:
    //MARK: functions

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

    }

    // Only override drawRect: if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func drawRect(rect: CGRect) {
        makeupUI()
    }

    func makeupUI() {

        self.layer.masksToBounds = true
        self.layer.cornerRadius = 3

        makefriendsBtn.layer.borderWidth = 1
        makefriendsBtn.layer.cornerRadius = 3
        makefriendsBtn.layer.borderColor = UIColor(red: 107/256, green: 167/256, blue: 249/256, alpha: 1).CGColor
        makefriendsBtn.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Selected)
        makefriendsBtn.addTarget(self, action: "buttonSelected:", forControlEvents: UIControlEvents.TouchUpInside)

        networkBtn.layer.borderWidth = 1
        networkBtn.layer.cornerRadius = 3
        networkBtn.layer.borderColor = UIColor(red: 107/256, green: 167/256, blue: 249/256, alpha: 1).CGColor
        networkBtn.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Selected)
        networkBtn.addTarget(self, action: "buttonSelected:", forControlEvents: UIControlEvents.TouchUpInside)

        everyoneBtn.layer.borderWidth = 1
        everyoneBtn.layer.cornerRadius = 0
        everyoneBtn.layer.borderColor = UIColor(red: 107/256, green: 167/256, blue: 249/256, alpha: 1).CGColor
        everyoneBtn.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Selected)
        everyoneBtn.addTarget(self, action: "buttonSelected:", forControlEvents: UIControlEvents.TouchUpInside)

        makefriendsBtnWidth.constant = (self.frame.width - 32 - 29) / 3 + 10
        networkBtnWidth.constant = (self.frame.width - 32 - 29) / 3 + 2
        everyoneBtnWidth.constant = (self.frame.width - 32 - 29) / 3 - 2

    }

    func buttonSelected(button: UIButton) {

        button.selected = !button.selected

        if button.selected == true {
            button.backgroundColor = UIColor(red: 107/256, green: 167/256, blue: 249/256, alpha: 1)
        } else {
            button.backgroundColor = UIColor.whiteColor()
        }
    }

}

下面就可以在ViewController.swift中调用了：

var myView = NSBundle.mainBundle().loadNibNamed("DemoView", owner: nil, options: nil).first as? DemoView

        myView?.frame = CGRect(x: 0, y: 0, width: self.view.frame.width-50, height: self.view.frame.height-140)
        myView?.center = self.view.center

        if myView != nil {
            self.view.addSubview(myView!)
        }

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