Question

我遇到UIPagecotrol的问题。它没有在模拟器中激活。点不会改变到下一个视图。

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    for (NSUInteger i =0; i < [self.childViewControllers count]; i++) {
        [self loadScrollViewWithPage:i];
    }

    self.pageControl.currentPage = 0;
    _page = 0;
    [self.pageControl setNumberOfPages:[self.childViewControllers count]];

    UIViewController *viewController = [self.childViewControllers objectAtIndex:self.pageControl.currentPage];
    if (viewController.view.superview != nil) {
        [viewController viewWillAppear:animated];

    }

    self.scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * [self.childViewControllers count], scrollView.frame.size.height);
}

- (void)loadScrollViewWithPage:(int)page {
    if (page < -0)
        return;
    if (page >= [self.childViewControllers count])
        return;

    // replace the placeholder if necessary
    UIViewController *controller = [self.childViewControllers objectAtIndex:page];
    if (controller == nil) {
        return;
    }

    // add the controller's view to the scroll view
    if (controller.view.superview == nil) {
        CGRect frame = self.scrollView.frame;
        frame.origin.x = frame.size.width * page;
        frame.origin.y = 0;
        controller.view.frame = frame;
        [self.scrollView addSubview:controller.view];
    }
}


// At the begin of scroll dragging, reset the boolean used when scrolls originate from the UIPageControl
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    _pageControlUsed = NO;
}

// At the end of scroll animation, reset the boolean used when scrolls originate from the UIPageControl
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    _pageControlUsed = NO;
}

- (IBAction)changePage:(id)sender; {

}

此处的源代码：https://mega.co.nz/#F!0EkBQbTK!bKjEwFf7BQsUx0YGtoHehw

只需下载zip并在Xcode中运行即可。请注意，UIPageControl不会随当前页面移动。

Answer 1

你可以看看这篇博客文章：http://mobileappdev.learningtree.com/2012/12/18/paging-with-collection-views-part-2/ ...我只是用它来设置我的UIPageControl元素，它运行正常。您可能需要根据您的特定需求进行调整......

页面更改时，UIPageControl指示符点不会更改

1 个答案: