iOS开发基础控件--UISegmentedControl

UISegmentedControl全局外观设置

分段控件是我们常用的控件之一，今天把具体用法总结了下：

1.初始化UISegmentedControl

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1. NSArray *segmentedArray = [[NSArray alloc]initWithObjects:@"1",@"2",@"3",nil];
2. UISegmentedControl *segmentedTemp = [[UISegmentedControl alloc]initWithItems:segmentedArray];
3. self.segmentedControl = segmentedTemp;
4. segmentedControl.frame = CGRectMake(10.0, 10.0, 300.0, 29.0);
5. 2.常用属性及设置方法如下：
6. //设置指定索引的题目
7. [segmentedControl setTitle:@"1" forSegmentAtIndex:1];
8. //设置指定索引的图片
9. [segmentedControl setImage:[UIImage imageNamed:@"home.png"] forSegmentAtIndex:2];
10. //在指定索引插入一个选项并设置图片
11. [segmentedControl insertSegmentWithImage:[UIImage imageNamed:@"more.png"] atIndex:2 animated:NO];
12. //在指定索引插入一个选项并设置题目
13. [segmentedControl insertSegmentWithTitle:@"new" atIndex:3 animated:NO];
14. //移除指定索引的选项
15. [segmentedControl removeSegmentAtIndex:0 animated:NO];
16. //设置指定索引选项的宽度
17. [segmentedControl setWidth:60.0 forSegmentAtIndex:2];
18. //设置选项中图片等的左上角的位置
19. //[segmentedControl setContentOffset:CGSizeMake(10.0,10.0) forSegmentAtIndex:1];
20. //设置默认选择项索引
21. segmentedControl.selectedSegmentIndex = 2;
22. //分段控件的颜色，只有样式为UISegmentedControlStyleBar的时候才有效果
23. segmentedControl.tintColor = [UIColor redColor];
24. //设置样式
25. segmentedControl.segmentedControlStyle = UISegmentedControlStyleBordered;
26. //设置在点击后是否恢复原样
27. segmentedControl.momentary = NO;
28. //设置指定索引选项不可选
29. [segmentedControl setEnabled:NO forSegmentAtIndex:3];
30. //判断指定索引选项是否可选
31. BOOL enableFlag = [segmentedControl isEnabledForSegmentAtIndex:3];
32. NSLog(@"%d",enableFlag);

3.分段控件点击事件：

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1. [segmentedControl addTarget:self
2. action:@selector(segmentAction:)
3. forControlEvents:UIControlEventValueChanged];

响应的事件：

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1. -(void)segmentAction:(UISegmentedControl *)Seg
2. {
3. NSInteger index = Seg.selectedSegmentIndex;
4. switch (index) {
5. case 0:
6. NSLog(@"0 clicked.");
7. break;
8. case 1:
9. NSLog(@"1 clicked.");
10. break;
11. case 2:
12. NSLog(@"2 clicked.");
13. break;
14. case 3:
15. NSLog(@"3 clicked.");
16. break;
17. case 4:
18. NSLog(@"4 clicked.");
19. break;
20. default:
21. break;
22. }
23. }

4.获取分段控件相应的值：

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1. //获取指定索引选项的图片imageForSegmentAtIndex：
2. UIImageView *imageForSegmentAtIndex = [[UIImageView alloc]initWithImage:[segmentedControl imageForSegmentAtIndex:1]];
3. imageForSegmentAtIndex.frame = CGRectMake(60.0, 100.0, 30.0, 30.0);
4. //获取指定索引选项的标题titleForSegmentAtIndex
5. UILabel *titleForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(100.0, 100.0, 30.0, 30.0)];
6. titleForSegmentAtIndex.text = [segmentedControl titleForSegmentAtIndex:0];
7. //获取总选项数segmentedControl.numberOfSegments
8. UILabel *numberOfSegments = [[UILabel alloc]initWithFrame:CGRectMake(140.0, 100.0, 30.0, 30.0)];
9. numberOfSegments.text = [NSString stringWithFormat:@"%d",segmentedControl.numberOfSegments];
10. //获取指定索引选项的宽度widthForSegmentAtIndex：
11. UILabel *widthForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(180.0, 100.0, 70.0, 30.0)];
12. widthForSegmentAtIndex.text = [NSString stringWithFormat:@"%f",[segmentedControl widthForSegmentAtIndex:2]];

但是这样的分段控件只有固定的几种样式。在IOS5以后，可以全局的设置一些控件的外观，分段控件就是其中一个（全局设置UISegmentedControl外观）：

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1. //cap insets用来指定哪些区域是固定不变的，未制定的区域则会repeat
2. UIImage *segmentSelected = [[UIImage imageNamed:@"bg_o.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(5, 5, 5, 5)];
3. UIImage *segmentUnselected = [[UIImage imageNamed:@"bg.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(5, 5, 5, 5)];
4. UIImage *segmentSelectedUnselected = [UIImage imageNamed:@"line.png"] ;
5. UIImage *segUnselectedSelected = [UIImage imageNamed:@"line.png"] ;
6. UIImage *segmentUnselectedUnselected = [UIImage imageNamed:@"line.png"];
7. //Segmente未选中背景
8. [[UISegmentedControl appearance] setBackgroundImage:segmentUnselected
9. forState:UIControlStateNormal
10. barMetrics:UIBarMetricsDefault];
11. //Segmente选中背景
12. [[UISegmentedControl appearance] setBackgroundImage:segmentSelected
13. forState:UIControlStateSelected
14. barMetrics:UIBarMetricsDefault];
15. //Segmente左右都未选中时的分割线
16. //BarMetrics表示navigation bar的状态，UIBarMetricsDefault 表示portrait状态（44pixel height），UIBarMetricsLandscapePhone 表示landscape状态（32pixel height）
17. [[UISegmentedControl appearance] setDividerImage:segmentUnselectedUnselected
18. forLeftSegmentState:UIControlStateNormal
19. rightSegmentState:UIControlStateNormal
20. barMetrics:UIBarMetricsDefault];
21. [[UISegmentedControl appearance] setDividerImage:segmentSelectedUnselected
22. forLeftSegmentState:UIControlStateSelected
23. rightSegmentState:UIControlStateNormal
24. barMetrics:UIBarMetricsDefault];
25. [[UISegmentedControl appearance] setDividerImage:segUnselectedSelected
26. forLeftSegmentState:UIControlStateNormal
27. rightSegmentState:UIControlStateSelected
28. barMetrics:UIBarMetricsDefault];
29. //字体
30. NSDictionary *textAttibutesUnSelected = [NSDictionary dictionaryWithObjectsAndKeys:
31. [UIFont systemFontOfSize:18],UITextAttributeFont,
32. [UIColor blackColor],UITextAttributeTextColor,
33. [UIColor whiteColor],UITextAttributeTextShadowColor,
34. [NSValue valueWithCGSize:CGSizeMake(1, 1)],UITextAttributeTextShadowOffset,nil];
35. NSDictionary *textAttibutesSelected = [NSDictionary dictionaryWithObjectsAndKeys:
36. [UIFont systemFontOfSize:18],UITextAttributeFont,
37. [UIColor whiteColor],UITextAttributeTextColor,
38. [UIColor whiteColor],UITextAttributeTextShadowColor,
39. [NSValue valueWithCGSize:CGSizeMake(0, 0)],UITextAttributeTextShadowOffset,nil];
40. [[UISegmentedControl appearance] setTitleTextAttributes:textAttibutesUnSelected
41. forState:UIControlStateNormal];
42. [[UISegmentedControl appearance] setTitleTextAttributes:textAttibutesSelected
43. forState:UIControlStateSelected];