PageControl的小点点随ScrollView滑动而变动代码

_scrollViewing=[[[UIScrollView alloc]initWithFrame:CGRectMake(0 ,  0, width(_specialView),  height(_specialView))] autorelease];
    _scrollViewing.backgroundColor=[UIColor grayColor];
    _scrollViewing.pagingEnabled=YES;
    _scrollViewing.contentSize=CGSizeMake(_scrollViewing.frame.size.width * 3, _scrollViewing.frame.size.height);
    _scrollViewing.showsVerticalScrollIndicator=NO;
    _scrollViewing.showsHorizontalScrollIndicator=NO;
    _scrollViewing.delegate=self;
    _scrollViewing.userInteractionEnabled = YES;//
    _scrollViewing.tag = kDailyScrollViewTag;//
    _scrollViewing.pagingEnabled = YES;//

    [_specialView addSubview:_scrollViewing];

 

 

_pageControl=[[[UIPageControl alloc]initWithFrame:CGRectMake(260 , 140 , 60 ,10)] autorelease];
    _pageControl.currentPageIndicatorTintColor = [UIColor whiteColor];
    _pageControl.numberOfPages=3;
    _pageControl.currentPage = 0;
    [_pageControl addTarget:self action:@selector(pageControlValueChanged:) forControlEvents:UIControlEventTouchUpInside];

    [_specialView addSubview:_pageControl];

 

//关键点

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    //PageControl的小点点随ScrollView滑动而变动
    CGFloat pagewidth = _scrollViewing.frame.size.width;
    int page = floor((_scrollViewing.contentOffset.x - pagewidth/(3+2))/pagewidth)+1;
    _pageControl.currentPage = page;
    
}

 

//分页控制器方法
-(void)pageControlValueChanged:(UIPageControl *)pageControl
{
    
    int currentPage=(int)pageControl.currentPage;
    _scrollViewing=(UIScrollView *)[self.view viewWithTag:kDailyScrollViewTag];
    if (currentPage>0)
    {
        [_scrollViewing setContentOffset:CGPointMake(currentPage*kIPhoneWidth, 0) animated:YES];
    }
    else
    {
        [_scrollViewing setContentOffset:CGPointMake(0, 0) animated:YES];
    }
    

}