实现UISCrollView循环滚动
1.循环滚动
若本次滚动是向后一页滚动，则把三页都向前放置，第一页放到末尾
初始化UISCrollView
float x,y,width,height;
x = WIDTH_OFF_SET;
y = HEIGHT_OFF_SET;
width = WIDTH_OFF_SET;
height = SCROLLVIEW_HEIGHT;
for (int j=0; j<3; j++) {
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(x*(j), y, width, height)];
[view setTag:10+j];//view的tag为10，11，12
[view setBackgroundColor:[UIColor yellowColor]];
for (int i=0; i UIButton*pointNButton = [UIButton buttonWithType:UIButtonTypeCustom]; [pointNButton setTitle:[NSString stringWithFormat:@"%d",100+i] forState:UIControlStateNormal]; [pointNButton setBackgroundColor:[UIColor blueColor]]; [pointNButton setTag:100+i]; [pointNButton setFrame:CGRectMake(6.5+(13+65)*i, 8, 65, 65)]; [pointNButton addTarget:self action:@selector(pointBtnClicked:) forControlEvents:UIControlEventTouchUpInside]; [view addSubview:pointNButton]; } [scrollView addSubview:view]; [view release]; } [scrollView setDelegate:self]; [scrollView setPagingEnabled:NO]; [scrollView setContentSize:CGSizeMake(WIDTH_OFF_SET*3, 80.0)]; [scrollView setShowsHorizontalScrollIndicator:NO]; #define WIDTH_OFF_SET630.0 #define HEIGHT_OFF_SET0 #define SCROLLVIEW_WIDTH390.0 #define SCROLLVIEW_HEIGHT80.0 #define SET_FRAME(ARTICLEX) x = ARTICLEX.frame.origin.x + increase;\ if(x < 0) x = pageWidth * 2;\ if(x > pageWidth * 2) x = 0.0f;\ [ARTICLEX setFrame:CGRectMake(x, \ ARTICLEX.frame.origin.y,\ ARTICLEX.frame.size.width,\ ARTICLEX.frame.size.height)] #pragma mark - #pragma mark UIScrollViewDelegate //将三个view都向右移动，并更新三个指针的指向，article1永远指向当前显示的view，article0是左边的，article2是右边的 - (void)allArticlesMoveRight:(CGFloat)pageWidth { UIView *view0 = [scrollView viewWithTag:10]; UIView *view1 = [scrollView viewWithTag:11]; UIView *view2 = [scrollView viewWithTag:12]; UIView *tmpView = view2; view2 = view1; view1 = view0; view0 = tmpView; float increase = pageWidth; CGFloat x = 0.0f; SET_FRAME(view2); SET_FRAME(view0); SET_FRAME(view1); } - (void)allArticlesMoveLeft:(CGFloat)pageWidth { UIView *view0 = [scrollView viewWithTag:10]; UIView *view1 = [scrollView viewWithTag:11]; UIView *view2 = [scrollView viewWithTag:12]; UIView *tmpView = view0; view0 = view1; view1 = view2; view2 = tmpView; float increase = -pageWidth; CGFloat x = 0.0f; SET_FRAME(view1); SET_FRAME(view2); SET_FRAME(view0); } - (void)scrollViewDidScroll:(UIScrollView *)theScrollView { CGFloat pageWidth = WIDTH_OFF_SET; // 0 1 2 int page = floor((theScrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1; if(page == 1) { //用户拖动了，但是滚动事件没有生效 return; } else if (page == 0) { [self allArticlesMoveRight:pageWidth]; } else { [self allArticlesMoveLeft:pageWidth]; } CGPoint p = CGPointZero; p.x = pageWidth; [theScrollView setContentOffset:p animated:NO]; } - (void)scrollViewDidEndDecelerating:(UIScrollView *)theScrollView { CGFloat pageWidth = WIDTH_OFF_SET; // 0 1 2 int page = floor((theScrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1; if(page == 1) { //用户拖动了，但是滚动事件没有生效 return; } else if (page == 0) { [self allArticlesMoveRight:pageWidth]; } else { [self allArticlesMoveLeft:pageWidth]; } CGPoint p = CGPointZero; p.x = pageWidth; [theScrollView setContentOffset:p animated:NO]; } 2.种方法思想是一样的，运用scrollRectToVisible - (void)scrollViewDidEndDecelerating:(UIScrollView *)_scrollView { float currentPage =scrollView.contentOffset.x; NSLog(@"=======bao===scrollViewDidEndDragging==currentPage=%d",currentPage); if (currentPage >WIDTH_OFF_SET&¤tPage [scrollView scrollRectToVisible:CGRectMake(0,0,SCROLLVIEW_WIDTH,SCROLLVIEW_HEIGHT) animated:NO]; } else if (currentPage<0) { [scrollView scrollRectToVisible:CGRectMake(WIDTH_OFF_SET,0,SCROLLVIEW_WIDTH,SCROLLVIEW_HEIGHT) animated:NO]; } } 3。改变conentOffset #pragma mark UIScrollViewDelegate - (void)scrollViewDidScroll:(UIScrollView *)_scrollView { int currentPage =(int)scrollView.contentOffset.x; if (currentPage >WIDTH_OFF_SET) { scrollView.contentOffset = CGPointMake(abs(currentPage-WIDTH_OFF_SET), HEIGHT_OFF_SET); } else if (currentPage<0) { scrollView.contentOffset = CGPointMake(currentPage+WIDTH_OFF_SET,HEIGHT_OFF_SET); } } - (void)scrollViewDidEndDecelerating:(UIScrollView *)_scrollView { int x= (int)scrollView.contentOffset.x/BUTTON_OFFSET*BUTTON_OFFSET; [scrollView setContentOffset:CGPointMake(x, HEIGHT_OFF_SET) animated:YES]; } - (void)scrollViewDidEndDragging:(UIScrollView *)_scrollView willDecelerate:(BOOL)decelerate { if (!decelerate) { int x = (int)scrollView.contentOffset.y/BUTTON_OFFSET*BUTTON_OFFSET; [scrollView setContentOffset:CGPointMake(x, HEIGHT_OFF_SET) animated:YES]; } } 总之要想实现无缝链接就必须准备三屏你的数据，通过改变offset或是view的frame的的横纵坐标进而实现循环滚动