实现CHeckBox

Question

实现CHeckBox


     在iphone开发中,需要用到自动登录，或者记住密码，这些基本设置；而UILit不提供类似的CheckBox;那么就自己实现一个吧，

实现很简单，继承一个UIButton;添加一个BOLL属性ischecked;同时增加需要响应的目标和目标函数;

view sourceprint?

1. #import <UIKit/UIKit.h>  
   
2. 
   
3. @interface BECheckBox : UIButton {  
   
4. 
   
5. BOOL isChecked;  
   
6. 
   
7. id target;  
   
8. 
   
9. SEL fun;  
   
10. 
    
11. }  
    
12. 
    
13. @property (nonatomic,assign) BOOL isChecked;  
    
14. 
    
15. -(IBAction) checkBoxClicked;  
    
16. 
    
17. -(void)setTarget:(id)tar fun:(SEL )ff;  
    
18. 
    
19. @end
    
20.     在实现的同时，主要是初始化，设置内容模式为UIControlContentHorizontalAlignmentLeft;
    
21. 
    
22. BECheckBox实现
    
23. #import "BECheckBox.h"
    
24. @implementation BECheckBox
    
25. 
    
26. @synthesize isChecked;
    
27. 
    
28. - (id)initWithFrame:(CGRect)frame {
    
29. if (self = [super initWithFrame:frame]) {
    
30. // Initialization code
    
31.         self.contentHorizontalAlignment  = UIControlContentHorizontalAlignmentLeft;        
    
32. [self setImage:[UIImage imageNamed:@"com_btn_check.png"] forState:UIControlStateNormal];
    
33. [self addTarget:self action:@selector(checkBoxClicked) forControlEvents:UIControlEventTouchUpInside];
    
34. }
    
35. return self;
    
36. }
    
37. 
    
38. -(void)setTarget:(id)tar fun:(SEL)ff
    
39. {
    
40. target=tar;
    
41. fun=ff;
    
42. }
    
43. -(void)setIsChecked:(BOOL)check
    
44. {   
    
45. isChecked=check;
    
46. if (check) {
    
47. [self setImage:[UIImage imageNamed:@"com_btn_checked.png"] forState:UIControlStateNormal];
    
48. 
    
49. }
    
50. else {
    
51. [self setImage:[UIImage imageNamed:@"com_btn_check.png"] forState:UIControlStateNormal];
    
52. }
    
53. }
    
54. //响应点击事件
    
55. -(IBAction) checkBoxClicked
    
56. {
    
57. if(self.isChecked ==NO){
    
58. self.isChecked =YES;
    
59. [self setImage:[UIImage imageNamed:@"com_btn_checked.png"] forState:UIControlStateNormal];
    
60. 
    
61. }else{
    
62. self.isChecked =NO;
    
63. [self setImage:[UIImage imageNamed:@"com_btn_check.png"] forState:UIControlStateNormal];
    
64. 
    
65. }
    
66. if (target) {
    
67. if ([target respondsToSelector:fun) {
    
68. [target performSelector:fun];
    
69. }
    
70. }
    
71. }
    
72. 
    
73. - (void)dealloc {
    
74. target=nil;
    
75. [super dealloc];
    
76. }
    
77. 
    
78. 
    
79. @end

复制代码在使用BECheckBox, 关键是要设置他的目标和响应消息；最终效果如下：

项目源代码：/Files/jordenwu/BECheckBox.zip

1.png (112.76 KB, 下载次数: 3)

下载附件

2011-04-12 12:30 上传