未调用 ItemSelected - Xamarin.iOS F#

Posted 2023-03-14

【中文标题】未调用 ItemSelected - Xamarin.iOS F#

【英文标题】：ItemSelected not called - Xamarin.iOS F#

【发布时间】：2018-01-30 13:20:37

【问题描述】：

我有一个UICollectionViewController 定义如下：

    [<Register ("LandlordHome")>]
type LandlordHome (handle:IntPtr) = 
    inherit UICollectionViewController (handle)


    override x.ViewDidLoad () =
        base.ViewDidLoad ()

        let collectionViewDelegate = new CollectionViewFlowDelegate(new IntPtr())
        collectionViewDelegate.parent <- x

        x.CollectionView.Delegate <- collectionViewDelegate

为了清楚起见，我省略了不相关的代码。

接下来，我有一个UICollectionViewDelegateFlowLayout，定义如下：

    [<Register ("CollectionViewFlowDelegate")>]
type CollectionViewFlowDelegate (handle:IntPtr) = 
    inherit UICollectionViewDelegateFlowLayout (handle)

    let mutable parentViewController : UIViewController = null

    member this.parent 
        with get() = parentViewController 
        and set(value) = parentViewController <- value

    override x.ItemSelected(collectionView : UICollectionView, indexPath : NSIndexPath) = 
        let controller = new ChatControllerLandlord(new IntPtr())
        controller.GetListingId <- ""
        controller.GetPartnerId <- ""
        controller.GetLandlordId <- ""
        controller.GetPartnerName <- ""
        parentViewController.PresentViewController(controller,true,null)

这样做是为了覆盖ItemSelected 方法，以便当我点击UICollectionViewCell 时执行其中的代码。

但是，当我点击单元格时，什么也没有发生。

【参考方案1】：

我试过你的代码，找到了解决方法。

修改CollectionViewFlowDelegate的构造方法如下：

let collectionViewDelegate = new CollectionViewFlowDelegate()
collectionViewDelegate.parent <- x
x.CollectionView.Delegate <- collectionViewDelegate


type CollectionViewFlowDelegate () = 
inherit UICollectionViewDelegateFlowLayout ()