UISegmentedControl详解

当用户输入不仅仅是布尔值时，可使用分段控件（UISegmentedControl）。分段控件提供一栏按钮（有时称为按钮栏），但只能激活其中一个按钮。分段控件会导致用户在屏幕上看到的内容发生变化。它们常用于在不同类别的信息之间选择，或在不同的应用屏幕之间切换。下面介绍基本属性和基本方法的使用。

[代码]c#/cpp/oc代码：

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1NSArray *segmentedArray = [[NSArrayalloc]initWithObjects:@"1",@"2",@"3",@"4",nil]; 

2    //初始化UISegmentedControl 

3    UISegmentedControl *segmentedControl = [[UISegmentedControlalloc]initWithItems:segmentedArray]; 

4    segmentedControl.frame = CGRectMake(20.0, 20.0, 250.0, 50.0); 

5    segmentedControl.selectedSegmentIndex = 2;//设置默认选择项索引 

6    segmentedControl.tintColor = [UIColor redColor]; 

7　　//有基本四种样式

8    segmentedControl.segmentedControlStyle = UISegmentedControlStylePlain;//设置样式

[代码]c#/cpp/oc代码：

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1//segmentedControl.segmentedControlStyle = UISegmentedControlStyleBordered;//设置样式

[代码]c#/cpp/oc代码：

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1//segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;//设置样式

[代码]c#/cpp/oc代码：

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1//segmentedControl.segmentedControlStyle = UISegmentedControlStyleBezeled;//设置样式

[代码]c#/cpp/oc代码：

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1//  segmentedControl.momentary = YES;//设置在点击后是否恢复原样    

2    [segmentedControl setTitle:@"two"forSegmentAtIndex:1];//设置指定索引的题目

[代码]c#/cpp/oc代码：

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1[segmentedControl setImage:[UIImage imageNamed:@"btn_jyy.png"] forSegmentAtIndex:3];//设置指定索引的图片

[代码]c#/cpp/oc代码：

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1[segmentedControl insertSegmentWithImage:[UIImage imageNamed:@"mei.png"] atIndex:2 animated:NO];//在指定索引插入一个选项并设置图片

[代码]c#/cpp/oc代码：

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1[segmentedControl insertSegmentWithTitle:@"insert"atIndex:3 animated:NO];//在指定索引插入一个选项并设置题目

[代码]c#/cpp/oc代码：

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1[segmentedControl removeSegmentAtIndex:0 animated:NO];//移除指定索引的选项

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01//   [segmentedControl setWidth:70.0 forSegmentAtIndex:2];//设置指定索引选项的宽度 

02//   [segmentedControl setContentOffset:CGSizeMake(10.0,10.0) forSegmentAtIndex:4];//设置选项中图片等的左上角的位置 

03   

04    //获取指定索引选项的图片imageForSegmentAtIndex： 

05    UIImageView *imageForSegmentAtIndex = [[UIImageViewalloc]initWithImage:[segmentedControl imageForSegmentAtIndex:1]]; 

06    imageForSegmentAtIndex.frame = CGRectMake(60.0, 120.0, 30.0, 30.0);  ;

07   

08    //获取指定索引选项的标题titleForSegmentAtIndex 

09    UILabel *titleForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(100.0, 160.0, 30.0, 30.0)]; 

10    titleForSegmentAtIndex.text = [segmentedControl titleForSegmentAtIndex:0]; 

11   

12    //获取总选项数segmentedControl.numberOfSegments 

13    UILabel *numberOfSegments = [[UILabel alloc]initWithFrame:CGRectMake(140.0, 170.0, 30.0, 30.0)]; 

14    numberOfSegments.text = [NSString stringWithFormat:@"%d",segmentedControl.numberOfSegments];

15

16    //获取指定索引选项的宽度widthForSegmentAtIndex： 

17    UILabel *widthForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(180.0, 210.0, 70.0, 30.0)]; 

18    widthForSegmentAtIndex.text = [NSString stringWithFormat:@"%f",[segmentedControl widthForSegmentAtIndex:2]]; 

19    

20   // [segmentedControl setEnabled:NO forSegmentAtIndex:4];//设置指定索引选项不可选 

21   // BOOL enableFlag = [segmentedControl isEnabledForSegmentAtIndex:4];//判断指定索引选项是否可选 

22      [mySegmentedControladdTarget:selfaction:@selector(segmentAction:)forControlEvents:UIControlEventValueChanged]; //添加委托方法

23//具体委托方法实例  

24-(void)segmentAction:(UISegmentedControl *)Seg{

25    NSInteger Index = Seg.selectedSegmentIndex;

26    NSLog(@"Index %i", Index);

27    switch(Index) {

28        case0:

29            [self selectmyView1];

30            break;

31        case1:

32            [self selectmyView2];

33            break;

34        case2:

35            [self selectmyView3];

36            break;

37        case3:

38            [self selectmyView4];

39            break;

40        case4:

41            [self selectmyView5];

42            break;

43        case5:

44            [self selectmyView6];

45            break;   

46        default:

47            break;

48    }

49}

基本属性、方法如上，大家在实际开发中可根据实际需求选取适当属性和方法。

使用技巧：

在导航栏中添加UISegmentedControl ，实现的效果：

实现的代码：

[代码]c#/cpp/oc代码：

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01//自定义UISegmentedcontrol

02UISegmentedControl *segmentedControl=[[UISegmentedControl alloc] initWithFrame:CGRectMake(80.0f, 8.0f, 200.0f, 30.0f) ];

03    [segmentedControl insertSegmentWithTitle:@"Food to eat"atIndex:0 animated:YES];

04    [segmentedControl insertSegmentWithTitle:@"Food to avoid"atIndex:1 animated:YES];

05    segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;

06    segmentedControl.momentary = YES;

07    segmentedControl.multipleTouchEnabled=NO;

08    [segmentedControl addTarget:self action:@selector(Selectbutton:) forControlEvents:UIControlEventValueChanged];

09    UIBarButtonItem *segButton = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl]; //自定义UIBarButtonItem，封装定义好的UIsegmented。

10    [segmentedControl release];

11    self.navigationItem.rightBarButtonItem = segButton; //添加到导航栏中

12    [segButton release];