IOS基础控件--滚动视图 UIScrollView和UIScrollViewDelegate协议

UIScrollView 滚动视图

 1 #import "ViewController.h"
 2 
 3 #import "GlobalDefine.h"
 4 
 5 @interface ViewController ()
 6 
 7 @end
 8 
 9 @implementation ViewController
10 
11 - (void)viewDidLoad
12 {
13     [super viewDidLoad];
14     //滚动视图
15     UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, SCREENWIDTH, SCREENHEIGHT)];
16     //图片内容的宽高
17     scrollView.contentSize = CGSizeMake(5 * SCREENWIDTH, SCREENHEIGHT);
18     //启用分页
19     scrollView.pagingEnabled = YES;
20     //弹动
21     scrollView.bounces = NO;
22     
23     [self.view addSubview:scrollView];
24     
25     //添加5张图片
26     for (int i = 0; i < 5; ++i)
27     {
28         UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(i * SCREENWIDTH, 0, SCREENWIDTH, SCREENHEIGHT)];
29         imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.png", i]];
30         [scrollView addSubview:imageView];
31     }
32 }

UIScrollViewdDelegate协议

 1 - (void)viewDidLoad
 2 {
 3     [super viewDidLoad];
 4 
 5     //写相关代码
 6 
 7     //遵循协议代理
 8     scrollView.delegate = self;
 9 }
10 
11 
12 //常用方法
13 - (void)scrollViewDidScroll:(UIScrollView *)scrollView
14 {
15     NSLog(@"滑动时执行");
16 }
17 
18 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
19 {
20     NSLog(@"结束拖拽时执行");
21 }
22 
23 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
24 {
25     NSLog(@"单个滑动结束时执行");
26     //scrollView.contentOffset.x和scrollView.contentOffser.y计算内容偏移的坐标
27 }