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：

 1 #import "ViewController.h"
 2 
 3 @interface ViewController ()<UIScrollViewDelegate>
 4 {
 5     UISegmentedControl *segment;
 6     UIScrollView *scrollView;
 7 }
 8 @end
 9 
10 @implementation ViewController
11 
12 - (void)viewDidLoad {
13     [super viewDidLoad];
14 
15     scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(10, 30, 300, 400)];
16     scrollView.backgroundColor = [UIColor whiteColor];
17     scrollView.contentSize = CGSizeMake(900, 400);
18     scrollView.delegate = self;
19     scrollView.pagingEnabled = YES;
20     scrollView.scrollEnabled = NO;//是否允许滚动（默认允许）
21     [self.view addSubview:scrollView];
22 
23     UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 400)];
24     view.backgroundColor = [UIColor grayColor];
25     [scrollView addSubview:view];
26 
27     UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(300, 0, 300, 400)];
28     view1.backgroundColor = [UIColor brownColor];
29     [scrollView addSubview:view1];
30 
31     UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(600, 0, 300, 400)];
32     view2.backgroundColor = [UIColor purpleColor];
33     [scrollView addSubview:view2];
34 
35 
36     segment = [[UISegmentedControl alloc] initWithItems:@[@"1",@"2",@"3"]];
37     segment.frame = CGRectMake(10, 450,200, 40);
38     segment.selectedSegmentIndex = 0;
39     [segment addTarget:self action:@selector(segmentChange) forControlEvents:UIControlEventValueChanged];
40     [self.view addSubview:segment];
41 
42 }
43 -(void)segmentChange{
44     CGPoint p = {segment.selectedSegmentIndex*300,0};
45     [scrollView setContentOffset:p animated:YES];
46 }
47 
48 //停止减速--scrollview不动了之后调用的方法
49 -(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
50     //停止减速--scrollview不动了
51   //  NSLog(@"不动了");
52 
53     CGPoint p = scrollView.contentOffset;
54     float w = p.x;
55 
56     int index = w/scrollView.frame.size.width;
57     NSLog(@"当前：%d页",index);
58 
59     segment.selectedSegmentIndex = index;
60 
61 }
62 
63 - (void)didReceiveMemoryWarning {
64     [super didReceiveMemoryWarning];
65     // Dispose of any resources that can be recreated.
66 }
67 
68 @end