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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NSArray *segmentedArray = [[NSArrayalloc]initWithObjects:@"1",@"2",@"3",@"4",nil];
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//初始化UISegmentedControl
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UISegmentedControl *segmentedControl = [[UISegmentedControlalloc]initWithItems:segmentedArray];
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segmentedControl.frame = CGRectMake(20.0, 20.0, 250.0, 50.0);
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segmentedControl.selectedSegmentIndex = 2;//设置默认选择项索引
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segmentedControl.tintColor = [UIColor redColor];
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//有基本四种样式
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segmentedControl.segmentedControlStyle = UISegmentedControlStylePlain;//设置样式
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[代码]c#/cpp/oc代码：
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//segmentedControl.segmentedControlStyle = UISegmentedControlStyleBordered;//设置样式 |
[代码]c#/cpp/oc代码：
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// segmentedControl.momentary = YES;//设置在点击后是否恢复原样 |
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[segmentedControl setTitle:@"two" forSegmentAtIndex:1];//设置指定索引的题目
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[代码]c#/cpp/oc代码：
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[segmentedControl setImage:[UIImage imageNamed:@"btn_jyy.png"] forSegmentAtIndex:3];//设置指定索引的图片
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[代码]c#/cpp/oc代码：
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[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
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[代码]c#/cpp/oc代码：
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[segmentedControl insertSegmentWithTitle:@"insert" atIndex:3 animated:NO];//在指定索引插入一个选项并设置题目
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[代码]c#/cpp/oc代码：
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// [segmentedControl setWidth:70.0 forSegmentAtIndex:2];//设置指定索引选项的宽度 |
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// [segmentedControl setContentOffset:CGSizeMake(10.0,10.0) forSegmentAtIndex:4];//设置选项中图片等的左上角的位置
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//获取指定索引选项的图片imageForSegmentAtIndex：
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UIImageView *imageForSegmentAtIndex = [[UIImageViewalloc]initWithImage:[segmentedControl imageForSegmentAtIndex:1]];
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imageForSegmentAtIndex.frame = CGRectMake(60.0, 120.0, 30.0, 30.0); ;
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//获取指定索引选项的标题titleForSegmentAtIndex
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UILabel *titleForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(100.0, 160.0, 30.0, 30.0)];
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titleForSegmentAtIndex.text = [segmentedControl titleForSegmentAtIndex:0];
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//获取总选项数segmentedControl.numberOfSegments
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UILabel *numberOfSegments = [[UILabel alloc]initWithFrame:CGRectMake(140.0, 170.0, 30.0, 30.0)];
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numberOfSegments.text = [NSString stringWithFormat:@"%d",segmentedControl.numberOfSegments];
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//获取指定索引选项的宽度widthForSegmentAtIndex：
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UILabel *widthForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(180.0, 210.0, 70.0, 30.0)];
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widthForSegmentAtIndex.text = [NSString stringWithFormat:@"%f",[segmentedControl widthForSegmentAtIndex:2]];
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// [segmentedControl setEnabled:NO forSegmentAtIndex:4];//设置指定索引选项不可选
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// BOOL enableFlag = [segmentedControl isEnabledForSegmentAtIndex:4];//判断指定索引选项是否可选
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[mySegmentedControladdTarget:selfaction:@selector(segmentAction:)forControlEvents:UIControlEventValueChanged]; //添加委托方法
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//具体委托方法实例 |
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-(void)segmentAction:(UISegmentedControl *)Seg{
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NSInteger Index = Seg.selectedSegmentIndex;
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NSLog(@"Index %i", Index);
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switch (Index) {
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case 0:
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[self selectmyView1];
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break;
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case 1:
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[self selectmyView2];
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break;
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case 2:
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[self selectmyView3];
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break;
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case 3:
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[self selectmyView4];
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break;
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case 4:
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[self selectmyView5];
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break;
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case 5:
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[self selectmyView6];
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break;
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default:
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break;
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}
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} |
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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//自定义UISegmentedcontrol |
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UISegmentedControl *segmentedControl=[[UISegmentedControl alloc] initWithFrame:CGRectMake(80.0f, 8.0f, 200.0f, 30.0f) ]; |
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[segmentedControl insertSegmentWithTitle:@"Food to eat" atIndex:0 animated:YES];
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[segmentedControl insertSegmentWithTitle:@"Food to avoid" atIndex:1 animated:YES];
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segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
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segmentedControl.momentary = YES;
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segmentedControl.multipleTouchEnabled=NO;
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[segmentedControl addTarget:self action:@selector(Selectbutton:) forControlEvents:UIControlEventValueChanged];
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UIBarButtonItem *segButton = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl]; //自定义UIBarButtonItem，封装定义好的UIsegmented。
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[segmentedControl release];
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self.navigationItem.rightBarButtonItem = segButton; //添加到导航栏中
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[segButton release];
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