iOS分段控制器 - UISegmentedControl

简单的分段控制器 实现在导航条上

导入新建控制器
#import "ViewController.h"   
#import "Controller1.h"
#import "Controller2.h"

@interface ViewController (){
    Controller1 *V1;
    Controller2 *V2;
}

- (void)viewDidLoad {
    [super viewDidLoad];
//设置控件几个
NSArray*array = [NSArray arrayWithObjects:@"Controller1",@"Controller2",nil];
UISegmentedControl *segC = [[UISegmentedControl alloc]initWithItems:array];
 //开始时默认选中下标(第一个下标默认是0)
 segC.selectedSegmentIndex = 0;
    //添加分段控制器的点击事件
    [segC addTarget:self action:@selector(add:) forControlEvents:UIControlEventValueChanged];
  //控件渲染色(也就是外观字体颜色)
   segC.tintColor= [UIColor blackColor];
//按下是否会自动释放：
self.navigationItem.titleView = segC;
  V1 = [[Controller1 alloc]init];
    V2 = [[Controller2 alloc]init];
  //设置点进去第一个控制器
  [self.view addSubview:V1.view];
}
//switch判断点进去的控制器
- (void)add:(UISegmentedControl *)segmt{
    int index = (int)segmt.selectedSegmentIndex;
    switch(index) {
    case 0:{
            [self.view addSubview:V1.view];
            [V2.view removeFromSuperview];
        }
            break;
        case 1:{
            [self.view addSubview:V2.view];
            [V1.view removeFromSuperview];
        }
            break;
        default:
            break;
    }
}