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。
1.初始化UISegmentedControl
初始化方法：传入的数组可以是字符串也可以是UIImage对象的图片数组
NSArray *segmentedArray = [[NSArray alloc]initWithObjects:@"1",@"2",@"3",@"4",nil];
UISegmentedControl *segmentedControl = [[UISegmentedControl alloc]initWithItems:segmentedArray];
segmentedControl.frame = CGRectMake(20.0, 20.0, 250.0, 50.0);
segmentedControl.selectedSegmentIndex = 2;//设置默认选择项索引
segmentedControl.tintColor = [UIColor redColor];
2. 设置样式
⚠️：这个属性已经废弃，不再起任何作用，它的枚举如下：
segmentedControl.segmentedControlStyle = UISegmentedControlStylePlain
3.设置在点击后是否恢复原样
segmentedControl.momentary = YES
4.其他属性
设置标签宽度是否随内容自适应：
@property(nonatomic) BOOL apportionsSegmentWidthsByContent；
注意：如果设置为NO，则所有标签宽度一致，为最大宽度。
5.获取指定索引选项的图片imageForSegmentAtIndex：
UIImageView *imageForSegmentAtIndex = [[UIImageViewalloc]initWithImage:[segmentedControl imageForSegmentAtIndex:1]];
imageForSegmentAtIndex.frame = CGRectMake(60.0, 120.0, 30.0, 30.0); ;
6.获取指定索引选项的标题titleForSegmentAtIndex
UILabel *titleForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(100.0, 160.0, 30.0, 30.0)];
titleForSegmentAtIndex.text = [segmentedControl titleForSegmentAtIndex:0];
7.获取总选项数segmentedControl.numberOfSegments
UILabel *numberOfSegments = [[UILabel alloc]initWithFrame:CGRectMake(140.0, 170.0, 30.0, 30.0)];
numberOfSegments.text = [NSString stringWithFormat:@"%d",segmentedControl.numberOfSegments];
8.获取指定索引选项的宽度widthForSegmentAtIndex：
UILabel *widthForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(180.0, 210.0, 70.0, 30.0)];
widthForSegmentAtIndex.text = [NSString stringWithFormat:@"%f",[segmentedControl widthForSegmentAtIndex:2]];
9.设置指定索引选项不可选
// [segmentedControl setEnabled:NO forSegmentAtIndex:4];
10.判断指定索引选项是否可选
// BOOL enableFlag = [segmentedControl isEnabledForSegmentAtIndex:4];
11.添加委托方法
[mySegmentedControladdTarget:selfaction:@selector(segmentAction:)forControlEvents:UIControlEventValueChanged];
12.实现委托方法
-(void)segmentAction:(UISegmentedControl *)Seg{
NSInteger Index = Seg.selectedSegmentIndex;
NSLog(@"Index %i", Index);
switch (Index) {
case 0:
[self selectmyView1];
break;
case 1:
[self selectmyView2];
break;
case 2:
[self selectmyView3];
break;
case 3:
[self selectmyView4];
break;
case 4:
[self selectmyView5];
break;
case 5:
[self selectmyView6];
break;
default:
break;
}
}
13. 项目中实际应用，放在导航栏中
自定义UISegmentedcontrol
UISegmentedControl *segmentedControl=[[UISegmentedControl alloc] initWithFrame:CGRectMake(80.0f, 8.0f, 200.0f, 30.0f) ];
[segmentedControl insertSegmentWithTitle:@"1" atIndex:0 animated:YES];
[segmentedControl insertSegmentWithTitle:@"2" atIndex:1 animated:YES];
segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
segmentedControl.momentary = YES;
segmentedControl.multipleTouchEnabled=NO;
[segmentedControl addTarget:self action:@selector(Selectbutton:) forControlEvents:UIControlEventValueChanged];
UIBarButtonItem *segButton = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl]; //自定义UIBarButtonItem，封装定义好的UIsegmented。
[segmentedControl release];
self.navigationItem.rightBarButtonItem = segButton; //添加到导航栏中
[segButton release];
14.⚠️：下面是一些找到的图片，在xib中的一些设置
主要参考分段选择器
