Question

当我滚动图像时页面控制当前页面没有改变但是当我点击页面控件时它的工作正常，更改图像也滚动上面是我的代码帮助我找到错误并纠正错误

   scrollViewImage.delegate = self;
 int x=0;
scrollViewImage.pagingEnabled=YES;
NSArray *image=[[NSArray alloc]initWithObjects:@"1.png",@"2.png",@"3.png",@"4.png", nil];

int totalImage = (int)image.count;
for (int i=0; i<image.count; i++)
{
    UIImageView *img=[[UIImageView alloc]initWithFrame:CGRectMake(x, 0,[[UIScreen mainScreen] bounds].size.width, 140)];
    img.image=[UIImage imageNamed:[image objectAtIndex:i]];
    x=x+[[UIScreen mainScreen] bounds].size.width;
    [scrollViewImage addSubview:img];
}

scrollViewImage.contentSize=CGSizeMake(x, 115);
scrollViewImage.contentOffset=CGPointMake(0, 0);


// page control
   pageController = [[UIPageControl alloc]initWithFrame:CGRectMake(0, 400, 320, 36)];

[pageController addTarget:self action:@selector(pageChanged) forControlEvents:UIControlEventValueChanged];
UIPageControl *pageControl = [UIPageControl appearance];
pageControl.numberOfPages=totalImage;

pageControl.pageIndicatorTintColor = [UIColor whiteColor];
pageControl.currentPageIndicatorTintColor = [UIColor redColor];
pageControl.backgroundColor = [UIColor blackColor];
pageControl.layer.cornerRadius = 7.0;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
  }
- (void)viewDidUnload {

[super viewDidUnload];
}
- (IBAction)changePage:(id)sender {

UIPageControl *pager=sender;
int page = pager.currentPage;
CGRect frame = scrollViewImage.frame;
frame.origin.x = frame.size.width * page;
frame.origin.y = 0;
[scrollViewImage scrollRectToVisible:frame animated:YES];
}




- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
CGFloat viewWidth = scrollViewImage.frame.size.width;

int pageNumber = floor((scrollViewImage.contentOffset.x - viewWidth/2) / viewWidth) +1;
   pageController.currentPage = pageNumber;
pageController.currentPageIndicatorTintColor = [UIColor redColor ];
[scrollViewImage setContentOffset: CGPointMake(scrollViewImage.contentOffset.x,0)];
}

- (void)pageChanged {

int pageNumber = pageController.currentPage;
CGRect frame = scrollViewImage.frame;
frame.origin.x = frame.size.width*pageNumber;
frame.origin.y=0;
[scrollViewImage scrollRectToVisible:frame animated:YES];
 }

Answer 1

尝试添加以下方法

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    CGFloat pageWidth = self.scrollView.frame.size.width; // you need to have a **iVar** with getter for scrollView
    float fractionalPage = self.scrollView.contentOffset.x / pageWidth;
    NSInteger page = lround(fractionalPage);
    self.pageControl.currentPage = page; // you need to have a **iVar** with getter for pageControl
}

滚动图像时页面控制当前页面不变

1 个答案: