* UIScrollView的概念
?* UIScrollView的重要屬性
?* UIPageControl常用屬性
?* UIScrollView的代理方法(放大、縮小、拖拽)
#pragma ---UIScrollView的概念---
?*? UIScrollView是一個能夠滾動的試圖控件
*?能夠滑動的視圖,都是繼承于UIScrollView,而UIScrollView繼承于UIView
?*UIScrollView的子類：UITableView、UITextView、UICollectionView
#pragma --- UIScrollView的重要屬性---
?contentSize?能夠讓視圖顯示更多的內(nèi)容,contSize就是UIScrollView實際內(nèi)容大小.如果contentSize的尺寸比ScrollView小，或者相等，則ScrollView不能滑動
?contentOffset?平移量,能夠直接定位到你想看的內(nèi)容
?contentInset?給ScrollView四周增加額外的滾動區(qū)域,內(nèi)容的內(nèi)邊框
showsHorizontalScrollIndicator?是否設(shè)置水平滾動條
showsVerticalScrollIndicator?是否設(shè)置垂直滾動條
bounces?是否設(shè)置回滾效果
?scrollEnabled?是否滾動
?indicatorStyle?設(shè)置滾動條樣式
?pagingEnabled?設(shè)置滾動分頁
?要放大得掛上代理
maximumZoomScale?圖片最多能放大多少倍?
minimumZoomScale?圖片最多能縮小多少倍
decelerationRate?減速速率
//設(shè)置不包含導(dǎo)航欄?解決全屏滾動視圖上面導(dǎo)航欄處無圖片的問題，圖片從導(dǎo)航欄一下開始定位計算
?self.edgesForExtendedLayout?=?UIRectEdgeNone;?
//設(shè)置滾動視圖方向垂直
scrollView.direction?=?Vertical;
#pragma --- UIPageControl---
?//設(shè)置數(shù)目
?pageControl.numberOfPages?= 3;
? ? //設(shè)置只有一頁的時候不顯示
? ? pageControl.hidesForSinglePage?= YES;
?//設(shè)置在第幾個顯示
?pageControl.currentPage?= 1;
?//設(shè)置它的光圈顏色和光圈內(nèi)部顏色
?pageIndicatorTintColor?未選中的圈圈顏色
?currentPageIndicatorTintColor?選中的圈圈顏色
?//設(shè)置滾動條是否顯示
?showsHorizontalScrollIndicator
?showsVerticalScrollIndicator
?*將UIPageControl添加到UIScrollView上會使之隨之移動
所以應(yīng)該添加到視圖上
? ? [self.view addSubview:pageControl];
//即將減速的代理方法
//在此編寫讓pageControl光圈隨滾動視圖變化
- (void)scrollViewDidEndDecelerating:(UIScrollView?*)scrollView{
?NSInteger?curPage = scrollView.contentOffset.x/CGRectGetWidth(scrollView.frame);
?pageControl.currentPage?= curPage;
}
?#pragma ---UIScrollView代理方法---
?已經(jīng)滾動
- (void)scrollViewDidScroll:(UIScrollView*)scrollView
?已經(jīng)縮放
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
?開始拖拽
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
?將要拖拽結(jié)束 獲得降速的速率 和偏移量
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inoutCGPoint *)targetContentOffset
?拖拽結(jié)束 將要降速
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;
?開始降速
- (void)scrollViewWillBeginDecelerating:(UIScrollView?*)scrollView
?結(jié)束降速
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
滾動動畫將要消失
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
?設(shè)置縮放視圖
- (nullable?UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
?開始縮放
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(nullableUIView *)view
?結(jié)束縮放 以及縮放的比例
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(nullableUIView *)view atScale:(CGFloat)scale;
?是否可以滾動到頂部 設(shè)置YES?可以
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView
?移動到頂部調(diào)用
- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView;
