// 內(nèi)容視圖的大小,默認為CGSizeZero@property(nonatomic) CGSize contentSize;// 為內(nèi)容視圖周圍增加可滾動區(qū)域,默認為UIEdgeInsetsZero@property(nonatomic) UIEdgeInsets contentInset;// 內(nèi)容視圖的原點相對于scrollView的原點的偏移量(左上方向偏移為正數(shù)),默認為CGPointZero@property(nonatomic) CGPoint contentOffset;// 設置內(nèi)容視圖的原點相對于scrollView的原點的偏移量- (void)setContentOffset:(CGPoint)contentOffset animated:(BOOL)animated;

// 是否允許滑動,默認為YES@property(nonatomic,getter=isScrollEnabled) BOOL scrollEnabled;// 是否只允許同時滑動一個方向,默認為NO,如果設置為YES,用戶在水平/豎直方向開始進行滑動,便禁止同時在豎直/水平方向滑動(注: 當用戶在對角線方向開始進行滑動,則本次滑動可以同時在任何方向滑動)@property(nonatomic, getter=isDirectionalLockEnabled) BOOL directionalLockEnabled;// 是否允許點擊狀態(tài)欄讓距離狀態(tài)欄最近的scrollView滑動到頂部,默認為YES(注: 在iPhone中如果有多個將該屬性設置為YES的scrollView,則該方法無效;在iPad中則將距離狀態(tài)欄最近的scrollView滑動到頂部)@property(nonatomic) BOOL scrollsToTop;// 是否按頁數(shù)進行滑動,默認為NO,如果設置為YES,則在滑動時只會停止在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減速的比率,默認為UIScrollViewDecelerationRateNormal(慢慢停止),其余可選項為UIScrollViewDecelerationRateFast(快速停止)@property(nonatomic) CGFloat decelerationRate;// 將指定區(qū)域滑動到剛好可見處(即距離邊緣最近處)- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated;

// 指示器樣式,默認為UIScrollViewIndicatorStyleDefault(黑內(nèi)容白邊框,適用于任何背景),其余可選項為UIScrollViewIndicatorStyleBlack(全黑)和UIScrollViewIndicatorStyleWhite(全白)@property(nonatomic) UIScrollViewIndicatorStyle indicatorStyle;// 為指示器周圍增加可滾動區(qū)域,默認為UIEdgeInsetsZero@property(nonatomic) UIEdgeInsets scrollIndicatorInsets;// 是否在滑動時指示器可見,默認為YES@property(nonatomic) BOOL showsHorizontalScrollIndicator;@property(nonatomic) BOOL showsVerticalScrollIndicator;// 閃一下指示器(注: 建議在scrollView展示給用戶時調(diào)用一下,以提醒用戶該處可滑動)- (void)flashScrollIndicators;

// 返回是否用戶已經(jīng)觸碰了內(nèi)容視圖準備進行滑動(注: 該值被設置為YES的時候可能用戶只是觸碰了內(nèi)容視圖,但是并沒有開始進行滑動)@property(nonatomic,readonly,getter=isTracking) BOOL tracking;// 返回是否用戶已經(jīng)開始滑動內(nèi)容視圖(注: 該值被設置為YES之前可能需要先滑動一段時間或距離)@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仍然處于滑動中)@property(nonatomic,readonly,getter=isDecelerating) BOOL decelerating;// 是否延遲事件傳遞,默認為YES,如果設置為NO,scrollView會立即調(diào)用-touchesShouldBegin:withEvent:inContentView:方法以進行下一步操作@property(nonatomic) BOOL delaysContentTouches;// 是否可以取消內(nèi)容視圖被觸摸,默認為YES,如果設置為NO,則一旦開始跟蹤事件,即使手指進行移動也不會取消已經(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應的子視圖,默認返回YES,如果返回NO,該事件不會傳遞給對應的子視圖- (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,默認當子視圖是UIControl時返回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,默認為1.0@property(nonatomic) CGFloat minimumZoomScale;// 最大縮放比例,默認為1.0(必須大于minimumZoomScale才能正常工作)@property(nonatomic) CGFloat maximumZoomScale;// 縮放比例,默認為1.0@property(nonatomic) CGFloat zoomScale;// 設置縮放比例- (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,默認為UIScrollViewKeyboardDismissModeNone(不隱藏鍵盤),其余可選項為UIScrollViewKeyboardDismissModeOnDrag(當拖拽scrollView時隱藏鍵盤)和UIScrollViewKeyboardDismissModeInteractive(當拖拽鍵盤上方時隱藏鍵盤)@property(nonatomic) UIScrollViewKeyboardDismissMode keyboardDismissMode;

// 當scrollView的contentOffset發(fā)生變化時調(diào)用- (void)scrollViewDidScroll:(UIScrollView *)scrollView;// 將要開始拖拽時調(diào)用(注: 該方法可能需要先滑動一段時間或距離才會被調(diào)用)- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;// 當用戶停止拖拽時調(diào)用(注: 應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;// 當用戶停止拖拽時調(diào)用(注: 如果內(nèi)容視圖content view在停止拖拽后繼續(xù)移動,則decelerate參數(shù)為YES)- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;// 將要開始減速時調(diào)用(僅當停止拖拽后繼續(xù)移動時才會被調(diào)用)- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView;// 已經(jīng)結(jié)束減速時調(diào)用(僅當停止拖拽后繼續(xù)移動時才會被調(diào)用)- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;// 返回是否允許點擊狀態(tài)欄讓scrollView滑動到頂部,如果未實現(xiàn)該方法,則默認為YES(僅當scrollsToTop屬性為YES時才調(diào)用)- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView;// 當scrollView已經(jīng)滑動到頂部時調(diào)用(僅當點擊狀態(tài)欄讓scrollView滑動到頂部才調(diào)用)- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView;// 當-setContentOffset:animated:/-scrollRectVisible:animated:方法動畫結(jié)束時調(diào)用(僅當animated設置為YES時才調(diào)用)- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView;

// 當縮放比例更改時調(diào)用- (void)scrollViewDidZoom:(UIScrollView *)scrollView;// 參與縮放的子視圖- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView;// 將要開始縮放時調(diào)用- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view;// 已經(jīng)結(jié)束縮放時調(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);}