启用环绕的线性旋转木马

Question

我想制作一个启用了环绕的线性旋转木马（这样你就可以在任一方向无限滚动，它只会环绕）他们有一个 CarouselType.Linear，但它没有启用环绕。任何人都知道如何使用 iCarousel 或 UICollectionViews 做到这一点？我找不到关于如何制作自定义 iCarousel 布局的任何好的资源...那里有什么好的参考资料吗？

Alliance Carousel

        this.Carousel = new CarouselView(frame)
        {
            DataSource = new CylindericalDataSource(this),
            Delegate = new CylindericalDelegate(this)
        };
        this.Carousel.CarouselType = CarouselType.Linear;
        this.Carousel.ConfigureView();
        this.View.AddSubview(this.Carousel);

------------编辑-------------

回答@Rahul 的问题

    public override void DidScroll (CarouselView carouselView)
    {
        base.DidScroll (carouselView);

        nint numOfItems = carouselView.NumberOfItems;
        if (this._parentController != null &&
            this._parentController._studioViewController != null &&
            this._parentController._studioViewController.SuccessfullyReceivedProjectAndPageData () &&
            this._parentController._studioViewController.HasFlowCardCarouselFinishedLoading () &&
            numOfItems > 0)
        {
            // Enforce min and max values fro ScrollOffset so the user can't scroll the carousel off screen.  This is required when wrapping is turned off. 
            nfloat maxScrollOffset = ((nfloat)numOfItems) - 1f;
            nfloat minScrollOffset = 0f;
            if (carouselView.ScrollOffset < minScrollOffset)
            {
                carouselView.ScrollOffset = minScrollOffset;
            }
            if (carouselView.ScrollOffset > maxScrollOffset)
            {
                carouselView.ScrollOffset = maxScrollOffset;
            }
        }
    }

Answer 1

想通了。覆盖 ValueForOption 方法并强制 CarouseOption.Wrap 等于 1.0f。见下文

    /*--------------------------------------------------------------------------------*/
    // Class: CylindericalDelegate
    /*--------------------------------------------------------------------------------*/

    public class CylindericalDelegate : CarouselViewDelegate
    {

        /*--------------------------------------------------------------------------------*/
        // Constructors
        /*--------------------------------------------------------------------------------*/

        public CylindericalDelegate()
        {
        }

        /*--------------------------------------------------------------------------------*/
        // CylindericalDelegate Implementation
        /*--------------------------------------------------------------------------------*/

        public override nfloat ValueForOption(CarouselView carousel, CarouselOption option, nfloat aValue)
        {
            if (option == CarouselOption.Spacing)
            {
                return aValue * 1.1f;
            }
            if (option == CarouselOption.Wrap)
            {
                return 1.0f;
            }
            return aValue;
        }

        /*--------------------------------------------------------------------------------*/

    }

    /*--------------------------------------------------------------------------------*/

启用环绕的线性旋转木马

Linear Carousel with wrap enabled

c#

xamarin.ios

ios

icarousel

uicollectionview