1 #import "ViewController.h" 2 #define WIDTH self.view.frame.size.width 3 #define HEIGHT self.view.frame.size.height 4 @interface ViewController ()<UIScrollViewDelegate> 5 @property (strong,nonatomic) UIImageView *imageView; 6 @property (strong,nonatomic) UIScrollView *scroll; 7 @property (strong,nonatomic) UIPageControl *pageControl; 8 @end 9 10 @implementation ViewController 11 12 - (void)viewDidLoad { 13 [super viewDidLoad]; 14 self.view.backgroundColor = [UIColor grayColor]; 15 //创建一个和屏幕等尺寸的ScorllView 16 _scroll = [[UIScrollView alloc] initWithFrame:self.view.frame]; 17 _scroll.backgroundColor = [UIColor yellowColor]; 18 //重要:水平方向滚动位置,contentSize--滚动范围 19 _scroll.contentSize = CGSizeMake(WIDTH * 7, 0); 20 21 //重要---按页来滚动 22 _scroll.pagingEnabled = YES; 23 //关闭屏幕回弹效果 24 _scroll.bounces = NO; 25 //关闭滚动条 26 _scroll.showsHorizontalScrollIndicator = NO; 27 //非常重要-偏移量 28 #pragma ************如果下边这一句不注掉那么运行工程的时候系统会自动偏移一次,从而会显示第二张图片 29 //_scroll.contentOffset = CGPointMake(WIDTH, 0); 30 //垂直方向的滚动范围 31 _scroll.contentSize = CGSizeMake(WIDTH * 7, 0); 32 _scroll.maximumZoomScale = 2; 33 _scroll.minimumZoomScale = 0.5; 34 35 //水平方向的视图摆放 36 for (int i = 1; i < 8; i++) { 37 //创建小的scrollView 38 UIScrollView *scroll2 = [[UIScrollView alloc]initWithFrame:CGRectMake((i - 1) * WIDTH, 0, WIDTH, HEIGHT)]; 39 40 //循环创建视图,添加到srollView上 41 self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)]; 42 self.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"h%d.jpeg",i]]; 43 [scroll2 addSubview:self.imageView]; 44 //一定要记得为每个小的scroll添加代理,否则不能实现缩放 45 scroll2.delegate = self; 46 scroll2.maximumZoomScale = 2; 47 scroll2.minimumZoomScale = 0.5; 48 [_scroll addSubview:scroll2]; 49 } 50 // //垂直方向的偏移量 51 // _scroll.contentOffset = CGPointMake(0, HEIGHT); 52 // for (int i = 1; i < 8; i++) { 53 // UIScrollView *scroll2 = [[UIScrollView alloc] initWithFrame:CGRectMake(0, (i - 1) * HEIGHT, WIDTH, HEIGHT)]; 54 // [_scroll addSubview:scroll2]; 55 // //self.imageView.frame = self.view.frame; 56 // self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)]; 57 // self.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"h%d.jpeg",i]]; 58 // [scroll2 addSubview:self.imageView]; 59 // } 60 61 // self.scroll.maximumZoomScale = 2; 62 // self.scroll.minimumZoomScale = 0.5; 63 64 [self.view addSubview:_scroll]; 65 _scroll.delegate = self; 66 //添加手势,双击屏幕,缩放回到原型 67 UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(setScrollZoom)]; 68 tap.numberOfTapsRequired =2; 69 [self.scroll addGestureRecognizer:tap]; 70 71 72 _pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, HEIGHT - 80, WIDTH, 40)]; 73 _pageControl.numberOfPages = 7; 74 _pageControl.pageIndicatorTintColor = [UIColor redColor]; 75 //当前页指示器(也就是小点点)的颜色 76 _pageControl.currentPageIndicatorTintColor = [UIColor greenColor]; 77 [self.view addSubview:_pageControl]; 78 [_pageControl addTarget:self action:@selector(pagAction:) forControlEvents:UIControlEventValueChanged]; 79 80 81 } 82 //实现代理里的缩放 83 -(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView 84 { 85 _scroll.subviews[0].center = self.view.center; 86 return scrollView.subviews[0]; 87 } 88 #pragma mark - page的响应事件 89 90 - (void)pagAction:(UIPageControl *)sender{ 91 //根据paged当前的小圆点算出现在在显示的是第几张图片,从而改变偏移量 setContentOffset(跳转至指定的页面) 92 [self.scroll setContentOffset:CGPointMake(self.pageControl.currentPage * WIDTH, 0) animated:YES]; 93 [self setScrollZoom]; 94 } 95 #pragma mark - 把所有的小scrollView的缩放比例变为1,也就是改回原型 96 - (void)setScrollZoom{ 97 //当减速结束的时候,那张图回复原样 98 //把所有的imv的缩放比例设置为1 99 for (UIScrollView *s in self.scroll.subviews) { 100 if ([s isKindOfClass:[UIScrollView class]]) { 101 [s setZoomScale:1 animated:NO]; 102 } 103 } 104 } 105 106 107 108 109 110 -(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView 111 { 112 NSLog(@"开始拖拽的时候触发"); 113 } 114 #pragma mark--UIScrollView 滚动协议方法 115 -(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate 116 { 117 [self setScrollZoom]; 118 NSLog(@"结束拖拽时触发"); 119 } 120 121 122 123 -(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView 124 { 125 NSLog(@"开始减速时触发"); 126 } 127 #pragma mark -scroll的代理方法,减速结束 128 -(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView 129 { 130 //根据偏移量算出现在在显示的是第几张图片,从而改变paged当前的小圆点 131 self.pageControl.currentPage = self.scroll.contentOffset.x/WIDTH; 132 [self setScrollZoom]; 133 NSLog(@"减速完成时触发"); 134 } 135 136 - (void)didReceiveMemoryWarning { 137 [super didReceiveMemoryWarning]; 138 // Dispose of any resources that can be recreated. 139 } 140 141 @end