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：

1. class CoreView: UIView {
2. //MARK:
3. //MARK: properties
4. @IBOutlet weak var makefriendsBtn: UIButton!
5. @IBOutlet weak var networkBtn: UIButton!
6. @IBOutlet weak var everyoneBtn: UIButton!
7. //MARK:
8. //MARK: constraints
9. @IBOutlet weak var makefriendsBtnWidth: NSLayoutConstraint!
10. @IBOutlet weak var networkBtnWidth: NSLayoutConstraint!
11. @IBOutlet weak var everyoneBtnWidth: NSLayoutConstraint!
12. //MARK:
13. //MARK: functions
14. required init(coder aDecoder: NSCoder) {
15. super.init(coder: aDecoder)
16. }
17. // Only override drawRect: if you perform custom drawing.
18. // An empty implementation adversely affects performance during animation.
19. override func drawRect(rect: CGRect) {
20. makeupUI()
21. }
22. func makeupUI() {
23. self.layer.masksToBounds = true
24. self.layer.cornerRadius = 3
25. makefriendsBtn.layer.borderWidth = 1
26. makefriendsBtn.layer.cornerRadius = 3
27. makefriendsBtn.layer.borderColor = UIColor(red: 107/256, green: 167/256, blue: 249/256, alpha: 1).CGColor
28. makefriendsBtn.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Selected)
29. makefriendsBtn.addTarget(self, action: "buttonSelected:", forControlEvents: UIControlEvents.TouchUpInside)
30. networkBtn.layer.borderWidth = 1
31. networkBtn.layer.cornerRadius = 3
32. networkBtn.layer.borderColor = UIColor(red: 107/256, green: 167/256, blue: 249/256, alpha: 1).CGColor
33. networkBtn.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Selected)
34. networkBtn.addTarget(self, action: "buttonSelected:", forControlEvents: UIControlEvents.TouchUpInside)
35. everyoneBtn.layer.borderWidth = 1
36. everyoneBtn.layer.cornerRadius = 0
37. everyoneBtn.layer.borderColor = UIColor(red: 107/256, green: 167/256, blue: 249/256, alpha: 1).CGColor
38. everyoneBtn.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Selected)
39. everyoneBtn.addTarget(self, action: "buttonSelected:", forControlEvents: UIControlEvents.TouchUpInside)
40. makefriendsBtnWidth.constant = (self.frame.width - 32 - 29) / 3 + 10
41. networkBtnWidth.constant = (self.frame.width - 32 - 29) / 3 + 2
42. everyoneBtnWidth.constant = (self.frame.width - 32 - 29) / 3 - 2
43. }
44. func buttonSelected(button: UIButton) {
45. button.selected = !button.selected
46. if button.selected == true {
47. button.backgroundColor = UIColor(red: 107/256, green: 167/256, blue: 249/256, alpha: 1)
48. } else {
49. button.backgroundColor = UIColor.whiteColor()
50. }
51. }
52. }

下面就可以在ViewController.swift中调用了：

1. var myView = NSBundle.mainBundle().loadNibNamed("DemoView", owner: nil, options: nil).first as? DemoView
2. myView?.frame = CGRect(x: 0, y: 0, width: self.view.frame.width-50, height: self.view.frame.height-140)
3. myView?.center = self.view.center
4. if myView != nil {
5. self.view.addSubview(myView!)
6. }