下面以自定义的UITableViewCell的代理为例，记录一下swift中代理的使用
controller中的代码如
1 //
2 // ViewController.swift
3 // simpleDemo
4 //
5 // Created by liubo on 16/7/25.
6 // Copyright © 2016年 liubo. All rights reserved.
7 //
8
9 import UIKit
10
11 class ViewController: UIViewController,
12 UITableViewDataSource,
13 UITableViewDelegate,
14 DelegateCellDelegate{
15
16 var tableView: UITableView?
17
18 //MARK: -- lifeCycle
19 override func viewDidLoad() {
20 super.viewDidLoad()
21
22 self.navigationController?.navigationBar.barTintColor = UIColor.cyanColor()
23 self.view.backgroundColor = UIColor.whiteColor()
24
25 initTableView()
26 }
27
28 //MARK: -- UITableViewDataSource
29 func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
30 return 10
31 }
32
33 func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
34 let cell = tableView.dequeueReusableCellWithIdentifier(NSStringFromClass(DelegateCell), forIndexPath: indexPath) as? DelegateCell
35 cell!.textLabel?.text = "\(indexPath.row)"
36 cell!.delegate = self
37 return cell!
38 }
39
40 //MARK: -- DelegateCellDelegate
41 func giveLike(btn: UIButton) {
42 print(123)
43 }
44
45 //MARK: -- private
46 func initTableView() {
47 let tableView = UITableView(frame: CGRectMake(0,0,self.view.width,self.view.height))
48 tableView.backgroundColor = UIColor.whiteColor()
49 tableView.dataSource = self
50 tableView.delegate = self
51 tableView .registerClass(DelegateCell.classForCoder(), forCellReuseIdentifier: NSStringFromClass(DelegateCell))
52 self.tableView = tableView
53 self.view.addSubview(self.tableView!)
54 }
55 }
controller.swift
Cell中的代码
1 //
2 // DelegateCell.swift
3 // simpleDemo
4 //
5 // Created by liubo on 16/7/26.
6 // Copyright © 2016年 liubo. All rights reserved.
7 //
8
9 import UIKit
10
11 protocol DelegateCellDelegate :NSObjectProtocol {
12
13 func giveLike(btn:UIButton)
14 }
15
16 class DelegateCell: UITableViewCell {
17 var likeButton: UIButton?
18 weak var delegate: DelegateCellDelegate?
19
20 override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
21 super.init(style: .Default, reuseIdentifier: reuseIdentifier)
22 initSubViews()
23 }
24
25 func initSubViews() {
26 let like = UIButton(type: .Custom)
27 like.frame = CGRectMake(UIScreen.mainScreen().bounds.size.width - 40, 10, 30, 30)
28 like.backgroundColor = UIColor.orangeColor()
29 like.setTitle("赞", forState: .Normal)
30 like.addTarget(self, action: Selector("lickClicked:"), forControlEvents: .TouchUpInside)
31 likeButton = like
32 self.addSubview(likeButton!)
33 }
34
35 func lickClicked(sender: UIButton) {
36 delegate?.giveLike(sender)
37
38 }
39
40 required init?(coder aDecoder: NSCoder) {
41 fatalError("init(coder) has not been implemented")
42 }
43
44 }
自定义Cell中的代码
在代码中用到了UIView的extension，值得一提的是在swift中可以直接对一个对象的结构体属性的成员进行直接赋值，这一点在OC中是做不到的
如要给一个view设置y值，在swift中可以这样写
public var x: CGFloat {
get {
return self.frame.origin.x
}
set {
self.frame.origin.x = newValue
}
}
而在OC中则要这样写
- (void) setTop: (CGFloat) newtop {
CGRect newframe = self.frame;
newframe.origin.y = newtop;
self.frame = newframe;
}
extension的代码如下
1 //
2 // UIViewExtension.swift
3 // joke
4 //
5 // Created by liubo on 16/7/26.
6 // Copyright © 2016年 liubo. All rights reserved.
7 //
8
9 import Foundation
10 import UIKit
11
12 extension UIView {
13 //x--left
14 public var x: CGFloat {
15 get {
16 return self.frame.origin.x
17 }
18 set {
19 self.frame.origin.x = newValue
20 }
21 }
22 //y--top
23 public var y: CGFloat {
24 get {
25 return self.frame.origin.y
26 }
27 set {
28 self.frame.origin.y = newValue
29 }
30 }
31 //width
32 public var width: CGFloat {
33 get {
34 return self.frame.size.width
35 }
36 set {
37 self.frame.size.width = newValue
38 }
39 }
40 //height
41 public var height: CGFloat {
42 get {
43 return self.frame.size.height
44 }
45 set {
46 self.frame.size.height = newValue
47 }
48 }
49 //right
50 public var right: CGFloat {
51 get {
52 return self.frame.origin.x + self.frame.size.width
53 }
54 set {
55 self.frame.origin.x = newValue - self.frame.size.width
56 }
57 }
58 //bottom
59 public var bottom: CGFloat {
60 get {
61 return self.frame.origin.y + self.frame.size.height
62 }
63 set {
64 self.frame.origin.y = newValue - self.frame.size.height
65 }
66 }
67
68 //中心x
69 public var centerX :CGFloat {
70 get {
71 return self.center.x
72 }
73 set {
74 self.center.x = newValue
75 }
76 }
77
78 //中心y
79 public var centerY :CGFloat {
80 get {
81 return self.center.y
82 }
83 set {
84 self.center.y = newValue
85 }
86 }
87
88 public var orign: CGPoint {
89 get {
90 return self.frame.origin
91 }
92 set {
93 self.frame.origin = newValue
94 }
95 }
96
97 public var size: CGSize {
98 get {
99 return self.frame.size
100 }
101 set {
102 self.frame.size = newValue
103 }
104 }
105 }
Extension.swift
在打出protocol DelegateCellDelegate {
func giveLike(btn:UIButton)
}后，发现不能用weak了修饰，代理我们都知道 arc中需要使用weak来避免循环引用造成内存泄漏，此时要在后面加上 :NSObjectProtocol，这样就能用weak来修饰
地址：http://pan.baidu.com/s/1dFbnCMP
时间： 2024-08-24 08:19:29