iPhone開發之自定義UICombox

iOS 中沒有下拉組件，下面是自己實現的分享給大家！

1. //
2. // CloCombox.h
3. // ColCombox
4. //
5. // Created by cloay on 12-11-12.
6. // Copyright (c) 2012年 topgether. All rights reserved.
7. //
9. #import <UIKit/UIKit.h>
11. @protocol CloComboxDelegate;
12. @interface CloCombox : UIView <UITableViewDataSource, UITableViewDelegate>{
13. UIButton *title;
14. UITableView *cloTable;
15. }
16. @property (nonatomic, retain) id <CloComboxDelegate> delegate;
17. @property (nonatomic, retain) NSArray *tableItems;
18. - (void)setTitle:(NSString *)titleStr;
19. - (id)initWithFrame:(CGRect)frame items:(NSArray *)items inView:(UIView *)view;
21. @end
22. @protocol CloComboxDelegate <NSObject>
24. - (void)itemDidSelected:(NSInteger)index;
26. @end

實現：

1. //
2. // CloCombox.m
3. // ColCombox
4. //
5. // Created by cloay on 12-11-12.
6. // Copyright (c) 2012年 topgether. All rights reserved.
7. //
9. #import "CloCombox.h"
11. @implementation CloCombox
12. @synthesize delegate, tableItems;
14. - (id)initWithFrame:(CGRect)frame
15. {
16. self = [super initWithFrame:frame];
17. if (self) {
18. // Initialization code
20. }
21. return self;
22. }
24. - (id)initWithFrame:(CGRect)frame items:(NSArray *)items inView:(UIView *)view{
25. self = [self initWithFrame:frame];
26. self.tableItems = items;
27. title = [UIButton buttonWithType:UIButtonTypeCustom];
28. [title setFrame:CGRectMake(0, 0, frame.size.width, 25)];
29. [title setTitle:@"未選擇" forState:UIControlStateNormal];
30. [title setBackgroundImage:[UIImage imageNamed:@""] forState:UIControlStateNormal];
31. [title addTarget:self action:@selector(titleBtnDidTaped:) forControlEvents:UIControlEventTouchUpInside];
32. [self addSubview:title];
33. cloTable = [[UITableView alloc] initWithFrame:CGRectMake((view.frame.size.width - frame.size.width)/2, 0, frame.size.width, 30*items.count) style:UITableViewStylePlain];
34. cloTable.delegate = self;
35. cloTable.dataSource = self;
36. cloTable.hidden = YES;
37. [view addSubview:cloTable];
38. return self;
39. }
40. /*
41. // Only override drawRect: if you perform custom drawing.
42. // An empty implementation adversely affects performance during animation.
43. - (void)drawRect:(CGRect)rect
44. {
45. // Drawing code
46. }
47. */
50. - (void)setTitle:(NSString *)titleStr{
51. [title setTitle:titleStr forState:UIControlStateNormal];
52. }
54. - (IBAction)titleBtnDidTaped:(id)sender{
55. cloTable.hidden = !cloTable.hidden;
56. }
58. - (void)dealloc{
59. [super dealloc];
60. [title release];
61. [cloTable release];
62. }
63. #pragma mark-
64. #pragma table view datasource
65. - (float)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
66. return 30;
67. }
69. - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
70. return tableItems.count;
71. }
73. - (UITableViewCell* )tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
74. static NSString *identifier = @"CELLIDENTIFIER";
75. UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
76. if (cell == nil) {
77. cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier] autorelease];
78. //if sdk version is below 6.0 instead by UITextAlignmentCenter
79. [cell.textLabel setTextAlignment:NSTextAlignmentCenter];
80. }
81. cell.textLabel.text = [tableItems objectAtIndex:indexPath.row];
82. return cell;
83. }
85. #pragma mark -
86. #pragma mark tableview delegate methods
88. - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
89. [tableView deselectRowAtIndexPath:indexPath animated:YES];
90. [self setTitle:[tableItems objectAtIndex:indexPath.row]];
91. tableView.hidden = YES;
92. if ([delegate respondsToSelector:@selector(itemDidSelected:)]) {
93. [delegate itemDidSelected:indexPath.row];
94. }
95. }
96. @end 

DEMO下載：CloCombox

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具體下載目錄在 /2012年資料/11月/13日/iPhone開發之自定義UICombox