UISegmentedControl

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