UIScrollView与UIPageController结合使用实现轮播

#import "ViewController.h"
#define WIDTH self.view.frame.size.width
#define HEIGHT self.view.frame.size.height
@interface ViewController ()<UIScrollViewDelegate>
@property (strong,nonatomic) UIImageView *imageView;
@property (strong,nonatomic) UIScrollView *scroll;
@property (strong,nonatomic) UIPageControl *pageControl;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor grayColor];
    //创建一个和屏幕等尺寸的ScorllView
    _scroll = [[UIScrollView alloc] initWithFrame:self.view.frame];
    _scroll.backgroundColor = [UIColor yellowColor];
    //重要:水平方向滚动位置,contentSize--滚动范围
    _scroll.contentSize = CGSizeMake(WIDTH * 7, 0);
    
    //重要---按页来滚动
    _scroll.pagingEnabled = YES;
    //关闭屏幕回弹效果
    _scroll.bounces = NO;
    //关闭滚动条
    _scroll.showsHorizontalScrollIndicator = NO;
    //非常重要-偏移量
#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
    //_scroll.contentOffset = CGPointMake(WIDTH, 0);
    //垂直方向的滚动范围
    _scroll.contentSize = CGSizeMake(WIDTH * 7, 0);
    _scroll.maximumZoomScale = 2;
    _scroll.minimumZoomScale = 0.5;

    //水平方向的视图摆放
    for (int i = 1; i < 8; i++) {
        //创建小的scrollView
        UIScrollView *scroll2 = [[UIScrollView alloc]initWithFrame:CGRectMake((i - 1) * WIDTH, 0, WIDTH, HEIGHT)];
       
        //循环创建视图,添加到srollView上
        self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];
        self.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"h%d.jpeg",i]];
        [scroll2 addSubview:self.imageView];
        //一定要记得为每个小的scroll添加代理,否则不能实现缩放
        scroll2.delegate = self;
        scroll2.maximumZoomScale = 2;
        scroll2.minimumZoomScale = 0.5;
         [_scroll addSubview:scroll2];
    }
//        //垂直方向的偏移量
//    _scroll.contentOffset = CGPointMake(0, HEIGHT);
//    for (int i = 1; i < 8; i++) {
//        UIScrollView *scroll2 = [[UIScrollView alloc] initWithFrame:CGRectMake(0, (i - 1) * HEIGHT, WIDTH, HEIGHT)];
//        [_scroll addSubview:scroll2];
//        //self.imageView.frame = self.view.frame;
//        self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];
//        self.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"h%d.jpeg",i]];
//        [scroll2 addSubview:self.imageView];
//    }
    
//    self.scroll.maximumZoomScale = 2;
//    self.scroll.minimumZoomScale = 0.5;
    
    [self.view addSubview:_scroll];
    _scroll.delegate = self;
    //添加手势,双击屏幕,缩放回到原型
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(setScrollZoom)];
    tap.numberOfTapsRequired =2;
    [self.scroll addGestureRecognizer:tap];
    
    
    _pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, HEIGHT - 80, WIDTH, 40)];
    _pageControl.numberOfPages = 7;
    _pageControl.pageIndicatorTintColor = [UIColor redColor];
    //当前页指示器(也就是小点点)的颜色
    _pageControl.currentPageIndicatorTintColor = [UIColor greenColor];
    [self.view addSubview:_pageControl];
    [_pageControl addTarget:self action:@selector(pagAction:) forControlEvents:UIControlEventValueChanged];
  
   
}
//实现代理里的缩放
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    _scroll.subviews[0].center = self.view.center;
    return scrollView.subviews[0];
}
#pragma mark - page的响应事件

- (void)pagAction:(UIPageControl *)sender{
    //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)
    [self.scroll setContentOffset:CGPointMake(self.pageControl.currentPage * WIDTH, 0) animated:YES];
    [self setScrollZoom];
}
#pragma mark - 把所有的小scrollView的缩放比例变为1,也就是改回原型
- (void)setScrollZoom{
    //当减速结束的时候,那张图回复原样
    //把所有的imv的缩放比例设置为1
    for (UIScrollView *s in self.scroll.subviews) {
        if ([s isKindOfClass:[UIScrollView class]]) {
            [s setZoomScale:1 animated:NO];
        }
    }
}





-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    NSLog(@"开始拖拽的时候触发");
}
#pragma mark--UIScrollView 滚动协议方法
-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    [self setScrollZoom];
    NSLog(@"结束拖拽时触发");
}



-(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView
{
    NSLog(@"开始减速时触发");
}
#pragma mark -scroll的代理方法,减速结束
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    //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
    self.pageControl.currentPage = self.scroll.contentOffset.x/WIDTH;
    [self setScrollZoom];
    NSLog(@"减速完成时触发");
}

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

@end