分段控件提供了⼀栏按钮，但是每次只能激活⼀个按钮，每⼀个按钮对应不同的屏幕显⽰的东西（这⾥的不同，应该理解为数据的不同，view是相同的，如筛选出不同的信息，但是view是⼀样的（布局样式是⼀样的））。      

 

//

//  ViewController.m

//  UISegmentedControl01

//

//  Created by cqy on 16/2/15.

//  Copyright © 2016年 程清杨. All rights reserved.

//

#import "ViewController.h"

@interface ViewController (){

    UISegmentedControl *seg;

}

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    //创建segmentcontrol

    NSMutableArray *itemArr = [NSMutableArray array];

    [itemArr addObject:@"first"];

    [itemArr addObject:@"second"];

    [itemArr addObject:@"thied"];

    //[[UISegmentedControl alloc] initWithItems:itemArr];为初始化⽅法，是UISegmentedControl特有的初始化⽅法。initWithItems：的参数是⼀个数组。

    seg = [[UISegmentedControl alloc] initWithItems:itemArr];

    //设置frame

    seg.frame = CGRectMake(50, 50, 200, 50);

    //设置分栏颜色

    seg.tintColor = [UIColor blueColor];

    //默认选中

    seg.selectedSegmentIndex = 0;

    //添加点击事件

    [seg addTarget:self action:@selector(segAction:) forControlEvents:UIControlEventValueChanged];

   

    [self.view addSubview:seg];

    //在这⾥添加⼀个button，每点击⼀次button，就会改变⼀次segment的标题：setTitle:@"第⼀项" forSegmentAtIndex:0说明把第0个分段的标题设置成“第⼀项”。

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

    btn.frame = CGRectMake(50, 150, 50, 50);

    btn.backgroundColor = [UIColor blueColor];

    [btn addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:btn];

   

    // Do any additional setup after loading the view, typically from a nib.

}

- (void)btnAction:(UIButton *)sender{

    NSLog(@".....");

    //设置分段上的文字

    [seg setTitle:@"第一项" forSegmentAtIndex:0];

    [seg setTitle:@"第二项" forSegmentAtIndex:1];

    [seg setTitle:@"第三项" forSegmentAtIndex:2];

    [seg insertSegmentWithTitle:@"第四项" atIndex:3 animated:YES];

}

-(void)segAction:(UISegmentedControl *)sender{

    //添加segment点击事件：第⼀个参数：谁来执⾏，第⼆个参数，到谁那⾥去找segAction⽅法，然后执⾏，第三个参数：事件改变的时候才执⾏。

   

    NSLog(@"%ld",sender.selectedSegmentIndex);

   

   

    if (sender.selectedSegmentIndex == 0) {

        [sender setTintColor:[UIColor redColor]];

    }else if (sender.selectedSegmentIndex == 1){

         [sender setTintColor:[UIColor greenColor]];

    }else if (sender.selectedSegmentIndex == 2){

         [sender setTintColor:[UIColor brownColor]];

    }else{

        [sender setTintColor:[UIColor yellowColor]];

    }

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end