分段控件UISegmentedControl

    UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:@[@"全部商家", @"优惠商家", @"我的"]];
    segmentedControl.center = CGPointMake(182, 45);
    
    // 每个segment的大小默认平分整个segmentedControl的大小，如果把apportionsSegmentWidthsByContent设置为YES，会根据内容来分配每一个segment的大小。
    segmentedControl.apportionsSegmentWidthsByContent = YES;
    
    // 设置当前选中segment下标
    segmentedControl.selectedSegmentIndex = 1;
    
    // 选中瞬间有效果，之后没有，恢复（不怎么用）
    // segmentedControl.momentary = YES;
    
    // 字体颜色
    segmentedControl.tintColor = [UIColor orangeColor];
    // segmentedControl.frame = CGRectMake(10, 30, 345, 30);
    
    // 给segmentedControl添加事件
    [segmentedControl addTarget:self action:@selector(doTapSegmentedControl:) forControlEvents:(UIControlEventValueChanged)];
    
    [self.view addSubview:segmentedControl];
    [segmentedControl release];

- (void)doTapSegmentedControl:(UISegmentedControl *)segmentControl
{
    NSLog(@"O(∩_∩)O哈哈~");
    switch (segmentcontrol.selectedSegmentIndex) {
        case 0:
            self.view.backgroundColor = [UIColor redColor];
            break;
        case 1:
            self.view.backgroundColor = [UIColor yellowColor];
            break;
        case 2:
            self.view.backgroundColor = [UIColor blueColor];
            break;
            
        default:
            break;
    }
}