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[操作系统]你真的了解UIScrollView吗?


一:首先查看一下关于UIScrollView的定义

NS_CLASS_AVAILABLE_IOS(2_0) @interface UIScrollView : UIView <NSCoding>//表示UIScrollView滚动的位置(就是内容左上角与scrollView左上角的间距!!)@property(nonatomic)     CGPoint           contentOffset;         // default CGPointZero//表示UIScrollView内容的尺寸,滚动范围@property(nonatomic)     CGSize            contentSize;          // default CGSizeZero//在UIScrollView的四周增加额外的滚动区域,一般用来避免scrollView的内容被其他控件挡住@property(nonatomic)     UIEdgeInsets         contentInset;      //委托    @property(nullable,nonatomic,weak) id<UIScrollViewDelegate>    delegate;            // default nil. weak reference//设置当向一个方向滚动的时候,是否锁住向另外一个方向的滚动@property(nonatomic,getter=isDirectionalLockEnabled) BOOL directionalLockEnabled;     // 默认值为 NO//设置UIScrollView是否需要弹簧效果@property(nonatomic)     BOOL             bounces;            // 默认值YES//是否一直有弹簧效果: 使用范围 ContentSize.height < ScrollView.height 的情况下垂直方向默认情况下是没有弹簧效果的, 但是设置了AlwaysBounceVertical = YES的时候就会让在这种情况下仍然有弹簧效果@property(nonatomic)     BOOL             alwaysBounceVertical;      // 默认值 NO@property(nonatomic)     BOOL             alwaysBounceHorizontal;     // 默认值 NO//控制控件是否整页翻动 默认值为NO@property(nonatomic,getter=isPagingEnabled) BOOL     pagingEnabled;         //设置UIScrollView是否能滚动@property(nonatomic,getter=isScrollEnabled) BOOL     scrollEnabled;         //默认值 YES//是否显示水平滚动条@property(nonatomic)     BOOL             showsHorizontalScrollIndicator; // 默认值YES//是否显示垂直滚动条@property(nonatomic)     BOOL             showsVerticalScrollIndicator;  // 默认值YES//设置滚动条到scrollView上左下右的边距,只有下和右有效// 参数1: 设置x值无效// 参数2: 设置y值无效// 参数3: 设置下面的距离// 参数4: 设置右边的距离@property(nonatomic)     UIEdgeInsets         scrollIndicatorInsets; // 设置滚动条的风格// .Default (默认)灰色// .Black  黑色的滚动条// .Whitr  白色的滚动条    @property(nonatomic)     UIScrollViewIndicatorStyle  indicatorStyle;         // 默认值 UIScrollViewIndicatorStyleDefault// // 设置手指放开后的减速率@property(nonatomic)     CGFloat           decelerationRate NS_AVAILABLE_IOS(3_0);//意思是需要动画 但是时间是苹果自己定义的第一个参数是你要滚动到的位置 第二个参数是是否要动画效果!- (void)setContentOffset:(CGPoint)contentOffset animated:(BOOL)animated; - (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated;     // scroll so rect is just visible (nearest edges). nothing if rect completely visible//短暂的显示一下状态条,当你将scrollView调整到最上面时,需要调用一下该方法- (void)flashScrollIndicators;     //只读,一旦用户开始触摸视图(也许还没有开始拖动),该属性值为YES@property(nonatomic,readonly,getter=isTracking)   BOOL tracking;    //只读,当用户开始拖动(手指已经在屏幕上滑动一段距离了),该属性值为YES@property(nonatomic,readonly,getter=isDragging)   BOOL dragging;    //只读,当用户松开手指,但视图仍在滚动时,该值返回YES@property(nonatomic,readonly,getter=isDecelerating) BOOL decelerating;  //是否推迟触屏手势处理,默认值为YES。设置为YES的时候,系统在确定是否发生scroll事件之后,才会处理触屏手势,否则,则会立即调用touchesShouldBegin:withEvent:inContentView:方法@property(nonatomic) BOOL delaysContentTouches;   //假如你设置canCancelContentTouches为YES,那么当你在UIScrollView上面放置任何子视图的时候,当你在子视图上移动手指的时候,UIScrollView会给子视图发送touchCancel的消息。而如果该属性设置为NO,ScrollView本身不处理这个消息,全部交给子视图处理 默认值YES@property(nonatomic) BOOL canCancelContentTouches;  //如果返回值为 yes , touch 事件传给子视图;如果为 no , touch 事件不传给子视图- (BOOL)touchesShouldBegin:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event inContentView:(UIView *)view;- (BOOL)touchesShouldCancelInContentView:(UIView *)view;// 设置最小的缩放倍数,默认值1.0@property(nonatomic) CGFloat minimumZoomScale; // 设置最大缩放倍数,默认值1.0@property(nonatomic) CGFloat maximumZoomScale; // 当前的缩放倍数@property(nonatomic) CGFloat zoomScale NS_AVAILABLE_IOS(3_0);      // 默认值 1.0//程序设置缩放大小- (void)setZoomScale:(CGFloat)scale animated:(BOOL)animated NS_AVAILABLE_IOS(3_0);//将内容视图缩放到指定的Rect中- (void)zoomToRect:(CGRect)rect animated:(BOOL)animated NS_AVAILABLE_IOS(3_0);//控制缩放的时候是否会反弹 默认值YES@property(nonatomic) BOOL bouncesZoom;     // default is YES. if set, user can go past min/max zoom while gesturing and the zoom will animate to the min/max value at gesture end//只读,用户是否正在进行缩放手势@property(nonatomic,readonly,getter=isZooming)    BOOL zooming;   //只读,当缩放超过最大或者最小范围的时候,回弹到最大最小范围的过程中,该值返回YES。@property(nonatomic,readonly,getter=isZoomBouncing) BOOL zoomBouncing; //设置是否可以自动滚动到顶部(点击上面状态栏的时候),默认为true@property(nonatomic) BOOL scrollsToTop;  //移动手势  只读@property(nonatomic, readonly) UIPanGestureRecognizer *panGestureRecognizer NS_AVAILABLE_IOS(5_0);// 缩放手势  只读@property(nullable, nonatomic, readonly) UIPinchGestureRecognizer *pinchGestureRecognizer NS_AVAILABLE_IOS(5_0);//当拖动发生时,键盘的消失模式,默认值是不消失UIScrollViewKeyboardDismissModeNone@property(nonatomic) UIScrollViewKeyboardDismissMode keyboardDismissMode NS_AVAILABLE_IOS(7_0);@end

UIScrollView用于显示超出屏幕大小内容,一般需要配合其他控件来使用,如添加一个UIImageView子控件,可以用来显示更大的图片;

UITableView、UICollectionView以及UITextView这些可以滑动显示更多内容的控件,都是UIScrollView的子类;

知识点1:关于UIScrollView的各个大小说明

 

知识点2:如果UIScrollView无法滚动,可能是以下原因:

1:没有设置contentSize2:scrollEnabled = NO3:没有接收到触摸事件:userInteractionEnabled = NO

 知识点3:iOS7以后,导航控制器会为其中的scrollView的顶部自动添加64的内边距,如果想去掉,可以通过下列属性去掉

self.automaticallyAdjustsScrollViewInsets = NO;

知识点4:UIScrollView实现滑动视图实例

//---导入代理@interface RootViewController ()<UIScrollViewDelegate>@end@implementation RootViewController//viewDidLoad只执行一次- (void)viewDidLoad {  [super viewDidLoad];  self.view.backgroundColor = [UIColor yellowColor];  //-创建滚动视图 当我们需要显示的内容超过一屏时,就需要用到滚动视图  UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.view.frame];  [scrollView setBackgroundColor:[UIColor orangeColor]];  [self.view addSubview:scrollView];  //-Key:设置滚动区域(内容区域的大小)  scrollView.contentSize = CGSizeMake(CGRectGetWidth(self.view.frame) * 4, CGRectGetHeight(self.view.frame));  //-为scrollview添加子视图//  NSArray *colorArr = [NSArray arrayWithObjects:[UIColor cyanColor], [UIColor greenColor], [UIColor redColor], [UIColor blueColor], nil];  NSArray *imageArr = [NSArray arrayWithObjects:[UIImage imageNamed: @"woman1.jpg"], [UIImage imageNamed: @"woman2.jpg"], [UIImage imageNamed: @"woman3.jpg"], [UIImage imageNamed:@"woman4.jpg"], nil];  for (int i = 0; i < 4; i++) {    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetWidth(self.view.frame)*i, 0, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame))];    label.text = [NSString stringWithFormat:@"这是志南的第%d夫人", i+1];    label.font = [UIFont systemFontOfSize:30];    label.textAlignment = NSTextAlignmentCenter;//    label.backgroundColor = colorArr[i];//    UIImageView *imageView = [[UIImageView alloc] initWithImage:imageArr[i]];    imageView.frame = CGRectMake(CGRectGetWidth(self.view.frame)*i, 0, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame));    [scrollView addSubview:imageView];    [scrollView addSubview:label];  }  //--设置分页效果  scrollView.pagingEnabled = YES;  //--设置横向滚动条是否显示 默认值为YES  scrollView.showsHorizontalScrollIndicator = YES;  //----------------------设置滚动条样式  //--设置边界是否有反弹效果 默认值为YES  scrollView.bounces = NO;  //---设置代理  scrollView.delegate = self;}#pragma mark -- 滚动视图的代理方法//将要开始拖拽(手指触碰到屏幕,并且移动)- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{  NSLog(@"---%s", __func__);}//已经开始滚动(只要scrollview是滚动状态就会调用此方法)- (void)scrollViewDidScroll:(UIScrollView *)scrollView{  //------滚动视图上面的子视图可以移动,不是子视图改变自身的frame值,而是,通过改变更改滚动视图(也就是子视图的父视图)的bounds的origin(也就是x,y)来更改子视图在父视图(滚动视图)上显示的位置  //scrollview的偏移量  CGPoint offSet = scrollView.contentOffset;  NSLog(@"----%s", __func__);  //得到scrollView的bounds的x点,即水平方向偏移量  NSLog(@"偏移量-----%f", offSet.x);  float x = scrollView.bounds.origin.x;  NSLog(@"bounds------%f", x);  /*------【回顾】:bounds改变导致其子视图位置改变!!!   改变子视图位置:scrollView滚动视图通过改变自身bounds,子view左上角坐标原点发生移动*/}//停止拖动(当手指(触摸对象)离开,正在滚动的视图减速)- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{  NSLog(@"--%s", __func__);}//视图真正静止(视图不动了)- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{  NSLog(@"%s",__func__);}- (void)didReceiveMemoryWarning {  [super didReceiveMemoryWarning];  // Dispose of any resources that can be recreated.}@end

知识点5:UIScrollView和UIPageControl配合使用

- (void)viewDidLoad{  [super viewDidLoad];// Do any additional setup after loading the view.  // 设置背景色  self.view.backgroundColor = [UIColor grayColor];  // 添加UIScrollView  self.userGuideScrollView = [[[UIScrollView alloc] initWithFrame:CGRectMake(0,0, self.view.frame.size.width, self.view.frame.size.height)] autorelease]; // 初始化位置和大小  self.userGuideScrollView.contentSize = CGSizeMake(self.view.frame.size.width* 11, self.view.frame.size.height); // 设置存放的内容的大小  _userGuideScrollView.pagingEnabled = YES; // 设置scrollView按一整页滑动  _userGuideScrollView.delegate = self; // 设置代理为当前  _userGuideScrollView.userInteractionEnabled = YES; // 设置可以与用户交互  _userGuideScrollView.showsHorizontalScrollIndicator = YES; // 显示滑动时候横向的滚动条  // 添加图片到UIScrollView中  for (int i = 1; i <= 11; i++) {    UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImageimageNamed:[NSString stringWithFormat:@"image%d", i]]];    imageView.frame = CGRectMake((i - 1) * self.view.frame.size.width, 0,self.view.frame.size.width, self.view.frame.size.height);    [_userGuideScrollView addSubview:imageView];    [imageView release], imageView = nil;  }  // 添加到当前的View  [self.view addSubview:_userGuideScrollView];  // 初始化UIPageController  self.scrollPageControl = [[[UIPageControl alloc] init] autorelease];  _scrollPageControl.frame = CGRectMake(0, self.view.frame.size.height - 60,self.view.frame.size.width, 30); // 设置位置  _scrollPageControl.numberOfPages = 11; // 设置有多少个小点点  _scrollPageControl.currentPage = 0; // 设置当前是哪个点点  _scrollPageControl.pageIndicatorTintColor = [UIColor blueColor]; // 没有选中的点点的颜色  _scrollPageControl.currentPageIndicatorTintColor = [UIColor yellowColor]; //当前点点的颜色  [_scrollPageControl addTarget:self action:@selector(scrollPageControlAction:)forControlEvents:UIControlEventValueChanged]; // 设置监听事件  _scrollPageControl.highlighted = YES;  [self.view addSubview:_scrollPageControl];}- (void)didReceiveMemoryWarning{  [super didReceiveMemoryWarning];  // Dispose of any resources that can be recreated.}#pragma mark - 实现---scrollPageControlAction:监听事件- (void)scrollPageControlAction:(UIPageControl *) sender {  //令UIScrollView做出相应的滑动显示  CGSize viewSize = _userGuideScrollView.frame.size;  CGRect rect = CGRectMake(sender.currentPage * viewSize.width, 0, viewSize.width, viewSize.height);  [_userGuideScrollView scrollRectToVisible:rect animated:YES];}#pragma mark - 重写----scrollViewDelegate中的代理方法 实现滑动-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {  // 计算偏移量  int index = abs(scrollView.contentOffset.x / scrollView.frame.size.width);  // 根据偏移量来设置pageControl  _scrollPageControl.currentPage = index;}#pragma mark - 重写----dealloc方法- (void)dealloc {  // 释放属性的内存  _scrollPageControl = nil;  _userGuideScrollView = nil;}

 

二:UIScrollView的代理UIScrollViewDelegate

@protocol UIScrollViewDelegate<NSObject>@optional//只要滚动了就会触发 - (void)scrollViewDidScroll:(UIScrollView *)scrollView;                        //缩放过程中不断调用该方法- (void)scrollViewDidZoom:(UIScrollView *)scrollView NS_AVAILABLE_IOS(3_2); //开始拖拽视图 调用该方法- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;//将要完成拖拽调用该方法- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset NS_AVAILABLE_IOS(5_0);//完成拖拽调用该方法- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;//将开始降速时调用该方法- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView; //减速停止了时执行,手触摸时执行 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;   //滚动动画停止时执行,代码改变时出发,也就是setContentOffset改变时 - (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView;//设置放大缩小的视图,要是uiscrollview的subview - (nullable UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView;  // 即将开始缩放时调用- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(nullable UIView *)view NS_AVAILABLE_IOS(3_2); //完成放大缩小时调用- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(nullable UIView *)view atScale:(CGFloat)scale;//如果你不是完全滚动到滚轴视图的顶部,你可以轻点状态栏,那个可视的滚轴视图会一直滚动到顶部,那是默认行为,你可以通过该方法返回NO来关闭它 - (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView; //已滚动顶部调用此方法- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView;   @end

 

知识点1:控件悬停效果;当scrollView往上拖拽到某一个位置的时候,控件(testView)悬停到某一个位置,当scrollView往下拉的时候,该控件(testView)又随着scrollView一起移动;

实现思路:当往上拖拽到一定位置的时候(通过计算偏移量来判断),让该控件(testView)添加到self.view上,并设置该控件(testView)的frame固定到该位置,当scrollView再次往回拖拽到该位置的时候,再让该控件(testView)再添加到scrollView上,成为scrollView的子控件

知识点2:顶部图片下拉放大效果;当scrollView往下拖拽的时候,让顶部的imageView按比例放大

实现思路:当scrollView往下拖拽的时候,通过偏移量来修改顶部imageView的transform(缩放的transform)。

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{  CGFloat imageH = self.imageView.frame.size.height;  CGFloat offsetY = scrollView.contentOffset.y;  // 该判断是实现scrollView内部的子控件悬停效果  if (offsetY >= imageH) {    // 将红色控件添加到控制器的view中,设置Y值为0    CGRect redF = self.redView.frame;    redF.origin.y = 0;    self.redView.frame = redF;    [self.view addSubview:self.redView];  }else{    // 将红色控件添加到scrollView中,设置Y值为图片的高度    CGRect redF = self.redView.frame;    redF.origin.y = 140;    self.redView.frame = redF;    [self.scrollView addSubview:self.redView];  }  // 实现下拉放大顶部图片效果  CGFloat scale = 1 - (offsetY / 70);  scale = (scale >= 1) ? scale : 1;  self.imageView.transform = CGAffineTransformMakeScale(scale, scale);}

知识点3:网上关于UIScrollView的循环播放及缩放功能的实例

//宏定义屏幕的宽和高#define ScreenWight [UIScreen mainScreen].bounds.size.width#define ScreenHeight [UIScreen mainScreen].bounds.size.height

@interface ViewController ()<UIScrollViewDelegate>//签滚动视图协议,为了实现协议方法/** 滚动视图属性 */@property(nonatomic, retain)UIScrollView *scrollView;/** 分页控件属性 */@property(nonatomic, retain)UIPageControl *pageControl;/** 标记属性 */@property(nonatomic, assign)BOOL flag;@end

- (void)loadView{  [super loadView];  self.scrollView = [[UIScrollView alloc] initWithFrame:self.view.frame];  //设置容量  self.scrollView.contentSize = CGSizeMake(8 * ScreenWight, ScreenHeight);  //添加滚动视图  [self.view addSubview:_scrollView];  //设置整页翻动  self.scrollView.pagingEnabled = YES;  //设置偏移量  self.scrollView.contentOffset = CGPointMake(ScreenWight, 0);  //设置代理人  self.scrollView.delegate = self;  for (NSInteger i = 1; i < 7; i++) {    //创建小的滚动视图    /**     为什么要创建小的滚动视图?     因为在进行缩放之后发现,之前的滚动效果发生了变化,     原因在于当我们进行缩放的时候,协议方法不但会改变视图的尺存,同样也可以改变scrollView的contenSize属性。     解决方法:大的scrollView上先铺设小的scrollView ,然后把imageView放到小的scrollView上     大的scrollView主要承担水平或垂直滚动,小的scrollView承担缩放的功能,     并且每个都设置好缩放比例,这样再进行缩放,只会改变小scrollView的contenSize, 不会改变scrollView的contentSize。     */    UIScrollView *tempScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(ScreenWight * i, 0, ScreenWight, ScreenHeight)];    tempScrollView.contentSize = CGSizeMake(ScreenWight, ScreenHeight);    //隐藏底部和右侧滚动条    tempScrollView.showsVerticalScrollIndicator = NO;    tempScrollView.showsHorizontalScrollIndicator = NO;    //设置缩放的比例    tempScrollView.minimumZoomScale = 0.5f;    tempScrollView.maximumZoomScale = 3.0f;    //小滚动视图设置代理,为的是实现缩放的代理方法    tempScrollView.delegate = self;    [self.scrollView addSubview:tempScrollView];    //循环往小滚动视图添加图片    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, ScreenWight, ScreenHeight)];    NSString *imageName = [NSString stringWithFormat:@"%ld.JPG", i];    imageView.image = [UIImage imageNamed:imageName];    [tempScrollView addSubview:imageView];        //设置轻拍手势    //首先打开imageView的用户交互,默认是关闭    imageView.userInteractionEnabled = YES;    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(didTapImageView:)];    tapGesture.numberOfTapsRequired = 2;    [imageView addGestureRecognizer:tapGesture];  }  //在最前面加上最后一张图,障眼法,给人一种感觉从第一页循环回最后一页  //在此刻改变滚动视图的偏移量  UIScrollView *frontScroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, ScreenWight, ScreenHeight)];  frontScroll.contentSize = CGSizeMake(ScreenWight, ScreenHeight);  [self.scrollView addSubview:frontScroll];  UIImageView *frontImageView = [[UIImageView alloc] initWithFrame:self.view.frame];  frontImageView.image = [UIImage imageNamed:@"6.JPG"];  [frontScroll addSubview:frontImageView];  //在最后面加上第一张图  UIScrollView *lastScroll = [[UIScrollView alloc] initWithFrame:CGRectMake(7 * ScreenWight, 0, ScreenWight, ScreenHeight)];  lastScroll.contentSize = CGSizeMake(ScreenWight, ScreenHeight);  [self.scrollView addSubview:lastScroll];  UIImageView *lastImageView = [[UIImageView alloc] initWithFrame:self.view.frame];  lastImageView.image = [UIImage imageNamed:@"1.JPG"];  [lastScroll addSubview:lastImageView];  //分页控件  self.pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(100, 600, 175, 30)];  self.pageControl.numberOfPages = 6;  [self.view addSubview:_pageControl];  [self.pageControl addTarget:self action:@selector(didClickedPageControl:) forControlEvents:UIControlEventValueChanged];}

#pragma mark 自定义方法,获取放大后显示的矩形区域- (CGRect)zoomRectByScale:(CGFloat)scale Center:(CGPoint)center{  CGRect zoomRect;  //求出新的长和宽  zoomRect.size.width = ScreenWight / scale;  zoomRect.size.height = ScreenHeight / scale;  //找到新的原点  zoomRect.origin.x = center.x * (1 - 1/scale);  zoomRect.origin.y = center.y * (1 - 1/scale);  return zoomRect;}

#pragma mark 轻拍方法- (void)didTapImageView:(UITapGestureRecognizer *)tap{  //这个是要获取当前点击的小滚动视图,而小滚动视图我们没有设置属性,无法在这儿获取  //当前点击视图的父视图,其实就是当前点击的小滚动视图,就通过这种方法获取滚动视图对象  UIScrollView *scroll = (UIScrollView *)tap.view.superview;  if (_flag == NO) {    CGRect newRect = [self zoomRectByScale:3.0 Center:[tap locationInView:tap.view]];    //zoomToRect方法是UIScrollVie对象的方法,将图片相对放大    [scroll zoomToRect:newRect animated:YES];    _flag = YES;  }else {    [scroll setZoomScale:1 animated:YES];    _flag = NO;  }}

#pragma mark 缩放的代理方法- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{  //这个代理方法就是要返回一个view跟着scrollView缩放,  //这个时候就会把scrollView的contentSize设置为imageView的大小  //同时只能有一个view跟着scrollView缩放  return scrollView.subviews.firstObject;}

#pragma mark 滚动结束的代理方法- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{  //滚动停止后,将每个小滚动视图比例还原  for (UIScrollView *tempScroll in scrollView.subviews) {    if ([tempScroll isKindOfClass:[UIScrollView class]]) {      tempScroll.zoomScale = 1.0;    }  }  //判断偏移量,并改变当前偏移量,实现循环播放功能  if (scrollView.contentOffset.x == 0) {    self.scrollView.contentOffset = CGPointMake(6 * ScreenWight, 0);  }  if (scrollView.contentOffset.x == ScreenWight * 7) {    self.scrollView.contentOffset = CGPointMake(ScreenWight, 0);  }  //获取当前的页数,即滚动视图控制分页控件  NSInteger pageNum = (long)(scrollView.contentOffset.x - ScreenWight) / ScreenWight;  //改变当前分页控件的显示页数  self.pageControl.currentPage = pageNum;}

#pragma mark 分页控件的触发方法- (void)didClickedPageControl:(UIPageControl *)pageControl{  //根据当前点的下标,修改滚动视图应该显示的图片,即分页控件控制滚动视图  CGPoint newPoint = CGPointMake((pageControl.currentPage + 1) * ScreenWight , 0);  //修改滚动视图偏移量  [self.scrollView setContentOffset:newPoint animated:YES];}