ScrollView/ScrollViewDelegate，scrollview

ScrollView/ScrollViewDelegate，scrollview

UIScrollView

 

1.contentOffset

/** 內容向外位移,只在初始狀態有效,拉拽後位移量變回0*/

@property(nonatomic) CGPoint contentOffset

 

2.contentSize

/** 內容大小*/

@property(nonatomic) CGSize contentSize

 

3.contentInset

/** 內容向內位移,一直有效*/

@property(nonatomic) UIEdgeInsets contentInset

 

4.scrollEnabled

/** 滾動可否*/

@property(nonatomic, getter=isScrollEnabled) BOOL scrollEnabled

 

5.directionLockEnabled

/** 是否支援同一時間垂直水平同時可拉拽,預設支援*/

@property(nonatomic, getter=isDirectionalLockEnabled) BOOL directionalLockEnabled

Discussion

If this property is NO, scrolling is permitted in both horizontal and vertical directions. If this property is YES and the user begins dragging in one general direction (horizontally or vertically), the scroll view disables scrolling in the other direction. If the drag direction is diagonal, then scrolling will not be locked and the user can drag in any direction until the drag completes. The default value is NO

 

6.pageEnabled

/** 滾動時最後會停在整數倍位置*/

@property(nonatomic, getter=isPagingEnabled) BOOL pagingEnabled

 

7.bounces

/** 遇到邊界是否會碰撞返回,預設YES*/

@property(nonatomic) BOOL bounces

 

8.decelerationRate

/** 滾動後減速的速度*/

@property(nonatomic) CGFloat decelerationRate

Discussion

Your application can use the UIScrollViewDecelerationRateNormal and UIScrollViewDecelerationRateFast constants as reference points for reasonable deceleration rates.

 

9.tracking/dragging/decelerating

/** tracking發生在剛接觸螢幕,dragging發生在拖拽時,decelerating發生在手鬆開後還滾動的時候*/

@property(nonatomic, readonly, getter=isTracking) BOOL tracking

@property(nonatomic, readonly, getter=isDragging) BOOL dragging

@property(nonatomic, readonly, getter=isDecelerating) BOOL decelerating

 

10.indicatorStyle

/** 捲軸Style*/

@property(nonatomic) UIScrollViewIndicatorStyle indicatorStyle

預設Default樣式

typedef enum : NSInteger {

   UIScrollViewIndicatorStyleDefault,

   UIScrollViewIndicatorStyleBlack,

   UIScrollViewIndicatorStyleWhite 

} UIScrollViewIndicatorStyle;

 

11.scrollIndicatorInsets

/** 捲軸內嵌距離*/

@property(nonatomic) UIEdgeInsets scrollIndicatorInsets

 

12.showsHorizontalScrollIndicator/VerticalScrollIndicator

/** 是否顯示捲軸*/

@property(nonatomic) BOOL showsHorizontalScrollIndicator

@property(nonatomic) BOOL showsVerticalScrollIndicator

 

13.flashScrollIndicators

/** 顯示捲軸在最前面時調用*/

- (void)flashScrollIndicators

Discussion

You should call this method whenever you bring the scroll view to front.

 

14.delegate

/** 代理*/

@property(nonatomic, assign) id< UIScrollViewDelegate > delegate

Discussion

The delegate must adopt the UIScrollViewDelegate protocol. 

 

15.keyboardDismissMode

/** 鍵盤消失時間*/

@property(nonatomic) UIScrollViewKeyboardDismissMode keyboardDismissMode

預設None

typedef enum : NSInteger {

   UIScrollViewKeyboardDismissModeNone,

   UIScrollViewKeyboardDismissModeOnDrag,

   UIScrollViewKeyboardDismissModeInteractive 

}UIScrollViewKeyboardDismissMode;

 

UIScrollViewDelegate

 

1.Dragging and Scrolling

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate

 

- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView

- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView

 

- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

 

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView

The scroll view calls this method at the end of its implementations of the setContentOffset:animated: and scrollRectToVisible:animated: methods, but only if animations are requested.

 

2.Zooming

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

Return Value

A UIView object that will be scaled as a result of the zooming gesture. Return nil if you don’t want zooming to occur.

 

- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale

- (void)scrollViewDidZoom:(UIScrollView *)scrollView