// 设置segment的显示项
self.mySegment=[[UISegmentedControl alloc]initWithItems:@[@"red",@"blue",@"green"]];
// 添加项
[self.mySegment insertSegmentWithTitle:@"yellow" atIndex:3 animated:YES];
//添加默认选中项
self.mySegment.selectedSegmentIndex=1;
// 设置位置
self.mySegment.frame=CGRectMake(100, 100, 200, 50);
// 添加事件
[self.mySegment addTarget:self action:@selector(changeA) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:self.mySegment];
案列
self.myimage = [[UIImageView alloc] initWithFrame:CGRectMake(0,60, self.view.frame.size.width, self.view.frame.size.height-50)];
[self.view addSubview:self.myimage];
// 文字
self.lblnn=[[UILabel alloc]initWithFrame:CGRectMake(50, 500, 300, 100)];
[self.lblnn setTextColor:[UIColor greenColor]];
self.lblnn.numberOfLines=5;
// 设置segment的显示项。
self.mysegment=[[UISegmentedControl alloc]initWithItems:@[@"桃花",@"梅花",@"樱花"]];
// 设置位置
self.mysegment.frame=CGRectMake(100, 20, 200, 30);
// 添加事件
[self.mysegment addTarget:self action:@selector(change) forControlEvents:UIControlEventValueChanged];
// 添加到视图
[self.view addSubview:self.mysegment];
}
-(void)change
{
int index=(int)self.mysegment.selectedSegmentIndex;
switch (index) {
case 0:
//获取图片
self.myimage.image = [UIImage imageNamed:@"timg-2.png"];
//添加到父视图上
[self.view addSubview:self.myimage];
self.lblnn.text =@"蔷薇科、桃属植物。落叶小乔木；叶为窄椭圆形至披针形，长15厘米，宽4厘米，先端成长而细的尖端，边缘有细齿，暗绿色有光泽，叶基具有蜜腺.";
[self.view addSubview:self.lblnn];
break;
case 1:
//获取图片
self.myimage.image = [UIImage imageNamed:@"timg.png"];
//添加到父视图上
[self.view addSubview:self.myimage];
self.lblnn.text =@"梅花，又名梅，别名：春梅、干枝梅、酸梅、乌梅, 蔷薇科、杏属小乔木，稀灌木，树皮浅灰色或带绿色，平滑；小枝绿色，光滑无毛。叶片卵形或椭圆形”";
[self.view addSubview:self.lblnn];
break;
case 2:
//获取图片
self.myimage.image = [UIImage imageNamed:@"12009759_224414328147_2.png"];
//添加到父视图上
[self.view addSubview:self.myimage];
self.lblnn.text =@"樱花（学名：Cerasus ssp.）：是蔷薇科樱属几种植物的统称，在《中国植物志》新修订的名称中专指“东京樱花”，亦称“日本樱花”。樱花品种相当繁多，数目超过三百种以上，全世界共有野生樱花约150种，中国有50多种。全世界约40种樱花类植物野生种祖先中，原产于中国的有33种";
[self.view addSubview:self.lblnn];
break;
default:
break;
}
}