Question

在我的ViewController中，我有一个包含两个viewControllers（AviewController和BviewController）的UIScrollView。滚动工作正常但是，我想添加一个无限循环，这意味着当滚动到达最后一个视图（BviewController）时，AviewController应该是下一个，反之亦然。

无法找到实现此方法。任何想法？

到目前为止，我已经在viewDidLoad：

let storyboard = UIStoryboard(name: "Main", bundle: nil)

    let AviewController = storyboard.instantiateViewControllerWithIdentifier("A_id") as! AviewController;
    let BviewController = storyboard.instantiateViewControllerWithIdentifier("B_id") as! BviewController;

    scrollView!.contentSize = CGSizeMake(2*CGRectGetWidth(AviewController.view.frame), CGRectGetHeight(view.frame));

    let viewControllers = [AviewController, BviewController]

    var idx:Int = 0;

    for viewController in viewControllers {
        // index is the index within the array
        // participant is the real object contained in the array
        addChildViewController(viewController);
        let originX:CGFloat = CGFloat(idx) * CGRectGetWidth(scrollView!.frame);
        viewController.view.frame = CGRectMake(originX, 0, viewController.view.frame.size.width, viewController.view.frame.size.height);
        scrollView!.addSubview(viewController.view)
        viewController.didMoveToParentViewController(self)
        idx++;
    }

Answer 1

一种覆盖UIScrollView的方法，将内容大小填充到比内容大得多的位置，然后在滚动时覆盖layoutSubviews以重新定位视图。

Apple提供的示例如下：https://developer.apple.com/library/ios/samplecode/StreetScroller/Introduction/Intro.html

特别要查看InfiniteScrollView文件https://developer.apple.com/library/ios/samplecode/StreetScroller/Listings/StreetScroller_InfiniteScrollView_m.html

以及layoutSubviews和recenterIfNecessary方法。

Swift - viewControllers之间的无限滚动

1 个答案: