IOS ——UI篇—— UISegmentedControl与UIScrollView的结合

这种结合方式和 UIPageControl的结合方式相同，下面做简单的示例：

#import "ViewController.h"

@interface ViewController ()<UIScrollViewDelegate>
{
    UISegmentedControl *segment;
    UIScrollView *scrollView;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(10, 30, 300, 400)];
    scrollView.backgroundColor = [UIColor whiteColor];
    scrollView.contentSize = CGSizeMake(900, 400);
    scrollView.delegate = self;
    scrollView.pagingEnabled = YES;
    scrollView.scrollEnabled = NO;//是否允许滚动（默认允许）
    [self.view addSubview:scrollView];

    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 400)];
    view.backgroundColor = [UIColor grayColor];
    [scrollView addSubview:view];

    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(300, 0, 300, 400)];
    view1.backgroundColor = [UIColor brownColor];
    [scrollView addSubview:view1];

    UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(600, 0, 300, 400)];
    view2.backgroundColor = [UIColor purpleColor];
    [scrollView addSubview:view2];


    segment = [[UISegmentedControl alloc] initWithItems:@[@"1",@"2",@"3"]];
    segment.frame = CGRectMake(10, 450,200, 40);
    segment.selectedSegmentIndex = 0;
    [segment addTarget:self action:@selector(segmentChange) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:segment];

}
-(void)segmentChange{
    CGPoint p = {segment.selectedSegmentIndex*300,0};
    [scrollView setContentOffset:p animated:YES];
}

//停止减速--scrollview不动了之后调用的方法
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    //停止减速--scrollview不动了
  //  NSLog(@"不动了");

    CGPoint p = scrollView.contentOffset;
    float w = p.x;

    int index = w/scrollView.frame.size.width;
    NSLog(@"当前：%d页",index);

    segment.selectedSegmentIndex = index;

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end