UIPageControl

self.pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 0, 275, 30)];    _pageControl.center = CGPointMake(375 / 2, 667 - 100);        self.view.backgroundColor = [UIColor whiteColor];    //设置当前点的颜色    _pageControl.currentPageIndicatorTintColor = [UIColor purpleColor];    //设置其他点颜色    _pageControl.pageIndicatorTintColor = [UIColor lightGrayColor];    //设置点的个数    _pageControl.numberOfPages = 6;    //设置当前点的位置    _pageControl.currentPage = 0;    //添加事件    [_pageControl addTarget:self action:@selector(pageControlAction:) forControlEvents:UIControlEventValueChanged];#pragma mark - 点击事件-(void)pageControlAction:(UIPageControl *)pageControl{    NSLog(@"%ld",pageControl.currentPage);    //设置scrollView的偏移量    _scrollView.contentOffset = CGPointMake(375 * pageControl.currentPage, 0);        }-(void)tapAction:(UITapGestureRecognizer *)tap{    UIAlertView *alerView = [[UIAlertView alloc] initWithTitle:@"温馨提示" message:@"欢迎使用" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确认", nil];    [alerView show];        [alerView release];        [self.scrollView removeFromSuperview];    [self.pageControl removeFromSuperview];}//将要减速-(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{    _pageControl.currentPage = scrollView.contentOffset.x / 375;}//停止-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{    _pageControl.currentPage = scrollView.contentOffset.x / 375;}