// 內(nèi)容視圖的大小,默認(rèn)為CGSizeZero
@property(nonatomic) CGSize contentSize;

// 為內(nèi)容視圖周圍增加可滾動(dòng)區(qū)域,默認(rèn)為UIEdgeInsetsZero
@property(nonatomic) UIEdgeInsets contentInset;

// 內(nèi)容視圖的原點(diǎn)相對(duì)于scrollView的原點(diǎn)的偏移量(左上方向偏移為正數(shù)),默認(rèn)為CGPointZero
@property(nonatomic) CGPoint contentOffset;

// 設(shè)置內(nèi)容視圖的原點(diǎn)相對(duì)于scrollView的原點(diǎn)的偏移量
- (void)setContentOffset:(CGPoint)contentOffset animated:(BOOL)animated;

// 是否允許滑動(dòng),默認(rèn)為YES
@property(nonatomic,getter=isScrollEnabled) BOOL scrollEnabled;

// 是否只允許同時(shí)滑動(dòng)一個(gè)方向,默認(rèn)為NO,如果設(shè)置為YES,用戶在水平/豎直方向開始進(jìn)行滑動(dòng),便禁止同時(shí)在豎直/水平方向滑動(dòng)(注: 當(dāng)用戶在對(duì)角線方向開始進(jìn)行滑動(dòng),則本次滑動(dòng)可以同時(shí)在任何方向滑動(dòng))
@property(nonatomic, getter=isDirectionalLockEnabled) BOOL directionalLockEnabled;

// 是否允許點(diǎn)擊狀態(tài)欄讓距離狀態(tài)欄最近的scrollView滑動(dòng)到頂部,默認(rèn)為YES(注: 在iPhone中如果有多個(gè)將該屬性設(shè)置為YES的scrollView,則該方法無效;在iPad中則將距離狀態(tài)欄最近的scrollView滑動(dòng)到頂部)
@property(nonatomic) BOOL scrollsToTop;

// 是否按頁(yè)數(shù)進(jìn)行滑動(dòng),默認(rèn)為NO,如果設(shè)置為YES,則在滑動(dòng)時(shí)只會(huì)停止在scrollView的bounds的倍數(shù)處
@property(nonatomic, getter=isPagingEnabled) BOOL pagingEnabled;

// 是否有觸底反彈效果,默認(rèn)為YES
@property(nonatomic) BOOL bounces;

// 是否總是有觸底反彈效果(即使內(nèi)容視圖小于scrollView的大小),默認(rèn)為NO(注: 生效的前提條件為bounces = YES)
@property(nonatomic) BOOL alwaysBounceHorizontal;
@property(nonatomic) BOOL alwaysBounceVertical;

// 指定用戶手指離開屏幕后滑動(dòng)減速的比率,默認(rèn)為UIScrollViewDecelerationRateNormal(慢慢停止),其余可選項(xiàng)為UIScrollViewDecelerationRateFast(快速停止)
@property(nonatomic) CGFloat decelerationRate;

// 將指定區(qū)域滑動(dòng)到剛好可見處(即距離邊緣最近處)
- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated;

// 指示器樣式,默認(rèn)為UIScrollViewIndicatorStyleDefault(黑內(nèi)容白邊框,適用于任何背景),其余可選項(xiàng)為UIScrollViewIndicatorStyleBlack(全黑)和UIScrollViewIndicatorStyleWhite(全白)
@property(nonatomic) UIScrollViewIndicatorStyle indicatorStyle;

// 為指示器周圍增加可滾動(dòng)區(qū)域,默認(rèn)為UIEdgeInsetsZero
@property(nonatomic) UIEdgeInsets scrollIndicatorInsets;

// 是否在滑動(dòng)時(shí)指示器可見,默認(rèn)為YES
@property(nonatomic) BOOL showsHorizontalScrollIndicator;
@property(nonatomic) BOOL showsVerticalScrollIndicator;

// 閃一下指示器(注: 建議在scrollView展示給用戶時(shí)調(diào)用一下,以提醒用戶該處可滑動(dòng))
- (void)flashScrollIndicators;

// 返回是否用戶已經(jīng)觸碰了內(nèi)容視圖準(zhǔn)備進(jìn)行滑動(dòng)(注: 該值被設(shè)置為YES的時(shí)候可能用戶只是觸碰了內(nèi)容視圖,但是并沒有開始進(jìn)行滑動(dòng))
@property(nonatomic,readonly,getter=isTracking) BOOL tracking;

// 返回是否用戶已經(jīng)開始滑動(dòng)內(nèi)容視圖(注: 該值被設(shè)置為YES之前可能需要先滑動(dòng)一段時(shí)間或距離)
@property(nonatomic,readonly,getter=isDragging) BOOL dragging;

// 返回是否處于減速狀態(tài)(即手指已經(jīng)離開屏幕,但scrollView仍然處于滑動(dòng)中)
@property(nonatomic,readonly,getter=isDecelerating) BOOL decelerating;

// 是否延遲事件傳遞,默認(rèn)為YES,如果設(shè)置為NO,scrollView會(huì)立即調(diào)用-touchesShouldBegin:withEvent:inContentView:方法以進(jìn)行下一步操作
@property(nonatomic) BOOL delaysContentTouches;

// 是否可以取消內(nèi)容視圖被觸摸,默認(rèn)為YES,如果設(shè)置為NO,則一旦開始跟蹤事件,即使手指進(jìn)行移動(dòng)也不會(huì)取消已經(jīng)傳遞給子視圖的事件
@property(nonatomic) BOOL canCancelContentTouches;

// 在UIScrollView的子類中重寫該方法,用于返回是否將事件傳遞給對(duì)應(yīng)的子視圖,默認(rèn)返回YES,如果返回NO,該事件不會(huì)傳遞給對(duì)應(yīng)的子視圖
- (BOOL)touchesShouldBegin:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event inContentView:(UIView *)view;

// 在UIScrollView的子類中重寫該方法,用于返回是否取消已經(jīng)傳遞給子視圖的事件,默認(rèn)當(dāng)子視圖是UIControl時(shí)返回NO,否則返回YES(注: 該方法被調(diào)用的前提是canCancelContentTouches = YES)
- (BOOL)touchesShouldCancelInContentView:(UIView *)view;

// 最小縮放比例,默認(rèn)為1.0
@property(nonatomic) CGFloat minimumZoomScale;

// 最大縮放比例,默認(rèn)為1.0(必須大于minimumZoomScale才能正常工作)
@property(nonatomic) CGFloat maximumZoomScale;

// 縮放比例,默認(rèn)為1.0
@property(nonatomic) CGFloat zoomScale;

// 設(shè)置縮放比例
- (void)setZoomScale:(CGFloat)scale animated:(BOOL)animated;

// 縮放到指定區(qū)域
- (void)zoomToRect:(CGRect)rect animated:(BOOL)animated;

// 是否允許觸底反彈,默認(rèn)為YES
@property(nonatomic) BOOL bouncesZoom;

// 返回是否正在縮放
@property(nonatomic,readonly,getter=isZooming) BOOL zooming;

// 返回是否正在觸底反彈
@property(nonatomic,readonly,getter=isZoomBouncing) BOOL zoomBouncing;

// 隱藏鍵盤模式,默認(rèn)為UIScrollViewKeyboardDismissModeNone(不隱藏鍵盤),其余可選項(xiàng)為UIScrollViewKeyboardDismissModeOnDrag(當(dāng)拖拽scrollView時(shí)隱藏鍵盤)和UIScrollViewKeyboardDismissModeInteractive(當(dāng)拖拽鍵盤上方時(shí)隱藏鍵盤)
@property(nonatomic) UIScrollViewKeyboardDismissMode keyboardDismissMode;

// 當(dāng)scrollView的contentOffset發(fā)生變化時(shí)調(diào)用
- (void)scrollViewDidScroll:(UIScrollView *)scrollView;

// 將要開始拖拽時(shí)調(diào)用(注: 該方法可能需要先滑動(dòng)一段時(shí)間或距離才會(huì)被調(diào)用)
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;

// 當(dāng)用戶停止拖拽時(shí)調(diào)用(注: 應(yīng)用程序可以通過修改targetContentOffset參數(shù)的值來調(diào)整內(nèi)容視圖content view停止的位置)
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset;

// 當(dāng)用戶停止拖拽時(shí)調(diào)用(注: 如果內(nèi)容視圖content view在停止拖拽后繼續(xù)移動(dòng),則decelerate參數(shù)為YES)
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;

// 將要開始減速時(shí)調(diào)用(僅當(dāng)停止拖拽后繼續(xù)移動(dòng)時(shí)才會(huì)被調(diào)用)
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView;

// 已經(jīng)結(jié)束減速時(shí)調(diào)用(僅當(dāng)停止拖拽后繼續(xù)移動(dòng)時(shí)才會(huì)被調(diào)用)
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;

// 返回是否允許點(diǎn)擊狀態(tài)欄讓scrollView滑動(dòng)到頂部,如果未實(shí)現(xiàn)該方法,則默認(rèn)為YES(僅當(dāng)scrollsToTop屬性為YES時(shí)才調(diào)用)
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView;

// 當(dāng)scrollView已經(jīng)滑動(dòng)到頂部時(shí)調(diào)用(僅當(dāng)點(diǎn)擊狀態(tài)欄讓scrollView滑動(dòng)到頂部才調(diào)用)
- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView;

// 當(dāng)-setContentOffset:animated:/-scrollRectVisible:animated:方法動(dòng)畫結(jié)束時(shí)調(diào)用(僅當(dāng)animated設(shè)置為YES時(shí)才調(diào)用)
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView;

// 當(dāng)縮放比例更改時(shí)調(diào)用
- (void)scrollViewDidZoom:(UIScrollView *)scrollView;

// 參與縮放的子視圖
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView;

// 將要開始縮放時(shí)調(diào)用
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view;

// 已經(jīng)結(jié)束縮放時(shí)調(diào)用
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale;

// 以"方式二"為例
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
 if (scrollView.contentOffset.y >= 100)
 {
  CGRect rect = label.frame;
  rect.origin.y = 0;
  label.frame = rect;

  [self.view addSubview:label];
 }
 else
 {
  CGRect rect = label.frame;
  rect.origin.y = 100;
  label.frame = rect;

  [scrollView addSubview:label];
 }
}

// 以"動(dòng)態(tài)修改圖片縮放比例于1倍和2倍之間"為例
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
 CGFloat scale = 1 - (scrollView.contentOffset.y / 100);
 scale = (scale >= 1) ? scale : 1;
 scale = (scale <= 2) ? scale : 2;
 imageView.transform = CGAffineTransformMakeScale(scale, scale);
}