UISegmentedControl用法详解

1、基本用法：

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor whiteColor];
    
    UISegmentedControl * segmented = [[UISegmentedControl alloc] initWithItems:@[@"1", @"2", @"3"]];
    segmented.frame = CGRectMake(100, 100, 150, 50);
    segmented.selectedSegmentIndex = 0; //设置默认选中项
    [segmented addTarget:self action:@selector(segmentedAction:) forControlEvents:UIControlEventValueChanged]; //添加事件
    [self.view addSubview:segmented];
}


- (void) segmentedAction:(id)sender {
    if ([sender isKindOfClass:[UISegmentedControl class]]) {
        UISegmentedControl * segment = sender;
        if (segment.selectedSegmentIndex == 0) {
            self.view.backgroundColor = [UIColor redColor];
        }else if (segment.selectedSegmentIndex == 1) {
            self.view.backgroundColor = [UIColor brownColor];
        }else if (segment.selectedSegmentIndex == 2) {
            self.view.backgroundColor = [UIColor blueColor];
        }
    }
}

2、设置选中部分的颜色

    NSUInteger numbers = segmented.numberOfSegments; // 返回总共有几个部分，只读属性
    segmented.tintColor = [UIColor purpleColor]; //设置选中部分的颜色

3、注：ios7后segmentedControlStyle属性不再有任何影响

4、不显示选中部分状态

    segmented.momentary = YES; //默认为NO

5、使用图片

使用图片前要先说一下，并不是所有的图片都可以，需要透明全品质图片。如果没有，可以有简单的方法自己制作一些透明全品质图片做测试用，下面给出制作方法：

（当然，如果你是PS大神，那就不用看了，那种图片还不是手到擒来）

首先，进入在线PS：http://www.webps.cn/

创建一张新图片：

设置一下图片大小：

在图片上随便加一些文字，然后保存为透明，全品质图像：

这样测试图片就有了。

将UISegmentControl的每一部分用图片表示：

测试代码：

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor whiteColor];
    
    UIImage * pic1Image = [UIImage imageNamed:@"my1.png"];
    UIImage * pic2Image = [UIImage imageNamed:@"my2.png"];
    UIImage * pic3Image = [UIImage imageNamed:@"my3.png"];
    NSArray * images = @[pic1Image, pic2Image, pic3Image];
    
    UISegmentedControl * segmented = [[UISegmentedControl alloc] initWithItems:images];
    segmented.frame = CGRectMake(100, 100, 150, 50);
    segmented.selectedSegmentIndex = 0; //设置默认选中项
    [segmented addTarget:self action:@selector(segmentedAction:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:segmented];
        
//    NSUInteger numbers = segmented.numberOfSegments; // 返回总共有几个部分，只读属性
//    segmented.tintColor = [UIColor purpleColor]; //设置选中部分的颜色
//    segmented.momentary = YES; //默认为NO  YES表示按钮按下后很快恢复
        
}

- (void) segmentedAction:(id)sender {
    if ([sender isKindOfClass:[UISegmentedControl class]]) {
        UISegmentedControl * segment = sender;
        if (segment.selectedSegmentIndex == 0) {
            //点击换为另外的图片
            UIImage * image = [UIImage imageNamed:@"yuan.png"];
            [segment setImage:image forSegmentAtIndex:0];
//            self.view.backgroundColor = [UIColor redColor];
        }else if (segment.selectedSegmentIndex == 1) {
              //点击换为文字
              [segment setTitle:@"second" forSegmentAtIndex:1];
//            self.view.backgroundColor = [UIColor brownColor];
        }else if (segment.selectedSegmentIndex == 2) {
//            self.view.backgroundColor = [UIColor blueColor];
        }
    }
}

初始：

点击二，变为文字second：

点击三，无变化：

点击一，变为另外的图片：

6、某一选项设置为不可选择：

[segmented setEnabled:NO forSegmentAtIndex:1];

设置为NO即为不可选择

7、插入删除：

#import "ViewController.h"

@interface ViewController ()
{
    UISegmentedControl * segmented;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor whiteColor];
    
    segmented = [[UISegmentedControl alloc] initWithItems:@[@"1", @"2", @"3"]];

    segmented.frame = CGRectMake(100, 100, 150, 50);
    segmented.selectedSegmentIndex = 0; //设置默认选中项

    [self.view addSubview:segmented];
    
    UIButton * btn1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btn1.frame = CGRectMake(100, 200, 50, 30);
    [btn1 setTitle:@"插入" forState:UIControlStateNormal];
    [btn1 setBackgroundColor:[UIColor brownColor]];
    [self.view addSubview:btn1];
    [btn1 addTarget:self action:@selector(insertSeg) forControlEvents:UIControlEventTouchUpInside];
    
    UIButton * btn2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btn2.frame = CGRectMake(180, 200, 50, 30);
    [btn2 setTitle:@"删除" forState:UIControlStateNormal];
    [btn2 setBackgroundColor:[UIColor brownColor]];
    [self.view addSubview:btn2];
    [btn2 addTarget:self action:@selector(deleteSeg) forControlEvents:UIControlEventTouchUpInside];
    
//    NSUInteger numbers = segmented.numberOfSegments; // 返回总共有几个部分，只读属性
//    segmented.tintColor = [UIColor purpleColor]; //设置选中部分的颜色
//    segmented.momentary = YES; //默认为NO  YES表示按钮按下后很快恢复
//    [segmented setEnabled:NO forSegmentAtIndex:1];
    
}

- (void) insertSeg {
    [segmented insertSegmentWithTitle:@"insert" atIndex:segmented.selectedSegmentIndex animated:YES];
}

- (void) deleteSeg {
    [segmented removeSegmentAtIndex:segmented.selectedSegmentIndex animated:YES];
}

初始：

点击插入：

点击删除：