UIScrollView------2常见代理使用

 1 #import "ViewController.h"
 2 
 3 @interface ViewController ()<UIScrollViewDelegate>
 4 @property (weak, nonatomic) IBOutlet UIScrollView *scrollView;
 5 @property (weak, nonatomic) IBOutlet UIImageView *image;
 6 
 7 @end
 8 
 9 @implementation ViewController
10 
11 - (void)viewDidLoad {
12     [super viewDidLoad];
13     _scrollView.delegate = self;
14     _scrollView.contentSize = CGSizeMake(1440, 900);
15     //设置放缩的比例
16     _scrollView.minimumZoomScale = 0.5;
17     _scrollView.maximumZoomScale = 2;
18 }
19 
20 #pragma mark UIScrollViewDelegate
21 
22 -(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
23     NSLog(@"用户开始拖拽时调用");
24 }
25 
26 -(void)scrollViewDidScroll:(UIScrollView *)scrollView{
27     NSLog(@"具体滚动到某个位置时调用");
28     NSLog(@"%@",NSStringFromCGPoint(_scrollView.contentOffset));
29 }
30 
31 -(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
32     NSLog(@"停止拖拽时调用");
33 }
34 
35 -(void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view{
36     NSLog(@"开始拖动");
37 }
38 
39 -(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
40     return _image;
41 }
42 
43 -(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale{
44     NSLog(@"正在拖动");
45 }
46 
47 @end

 1 #import "ViewController.h"
 2 
 3 @interface ViewController ()
 4 //滚动栏
 5 @property (weak, nonatomic) IBOutlet UIScrollView *banner;
 6 //分页
 7 @property (weak, nonatomic) IBOutlet UIPageControl *pageContrl;
 8 
 9 @end
10 
11 @implementation ViewController
12 
13 - (void)viewDidLoad {
14     [super viewDidLoad];
15     //设置滚动范围
16     _banner.contentSize = CGSizeMake(320*3, 200);
17     //分页
18     _banner.pagingEnabled = YES;
19     //隐藏底部指示器
20     _banner.showsHorizontalScrollIndicator = NO;
21     //初始化图片 并添加到banner中
22     for(int i=0;i<3;i++){
23         UIImageView *imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:[NSString stringWithFormat:@"image_%d.jpg",i+1]]];
24         imageView.frame = CGRectMake(i*320, 0, 320, 200);
25         [_banner addSubview:imageView];
26     }
27 }

 1 #import "ViewController.h"
 2 
 3 @interface ViewController ()<UIScrollViewDelegate>
 4 //滚动栏
 5 @property (weak, nonatomic) IBOutlet UIScrollView *banner;
 6 //分页
 7 @property (weak, nonatomic) IBOutlet UIPageControl *pageContrl;
 8 
 9 @end
10 
11 @implementation ViewController
12 
13 - (void)viewDidLoad {
14     [super viewDidLoad];
15     //设置滚动范围
16     _banner.contentSize = CGSizeMake(320*3, 200);
17     //分页
18     _banner.pagingEnabled = YES;
19     //隐藏底部指示器
20     _banner.showsHorizontalScrollIndicator = NO;
21     //初始化图片 并添加到banner中
22     for(int i=0;i<3;i++){
23         UIImageView *imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:[NSString stringWithFormat:@"image_%d.jpg",i+1]]];
24         imageView.frame = CGRectMake(i*320, 0, 320, 200);
25         [_banner addSubview:imageView];
26     }
27     //设置代理
28     _banner.delegate = self;
29 }
30 #pragma makr UIScrollViewDelegate
31 -(void)scrollViewDidScroll:(UIScrollView *)scrollView{
32     NSLog(@"正在滚动");
33     //计算页面
34     //页码（contentoffset.x + scrollView宽度/2）/scrollView宽度，这里利用UIScrollView分页机制
35     CGFloat bannerW = _banner.frame.size.width;
36     CGFloat x = _banner.contentOffset.x;
37     //页码
38     int page = (x + bannerW/2)/bannerW;
39     _pageContrl.currentPage = page;
40 }
41 
42 @end