小编典典

如何在集合视图中快速制作页眉和页脚

swift

如何在集合视图中快速创建页眉和页脚?

我正在尝试将页眉和页脚组合在一起,但是它一直崩溃,我找不到快速的教程来理解它。

我不怎么为两个人返回补充性观点,而只是返回一个。

我将它们都放在情节提要上(类+标识符)

 override func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
    //#warning Incomplete method implementation -- Return the number of sections
    return 2
}


override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    //#warning Incomplete method implementation -- Return the number of items in the section
    return 10
}




override func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {
    var header: headerCell!
    var footer: footerCell!



    if kind == UICollectionElementKindSectionHeader {
        header =
            collectionView.dequeueReusableSupplementaryViewOfKind(kind,
                withReuseIdentifier: "header", forIndexPath: indexPath)
            as? headerCell

}
    return header

}

错误: 标识符为1的UICollectionElementKindCell-必须为该标识符注册一个笔尖或一个类,或在情节提要中连接原型单元。

override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> profileCC {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("one", forIndexPath: indexPath) as! profileCC

    // Configure the cell

    return cell
}



override func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {

    switch kind {

    case UICollectionElementKindSectionHeader:

        let headerView = collectionView.dequeueReusableSupplementaryViewOfKind(kind, withReuseIdentifier: "header", forIndexPath: indexPath) as! headerCell

        headerView.backgroundColor = UIColor.blueColor();
        return headerView

    case UICollectionElementKindSectionFooter:
        let footerView = collectionView.dequeueReusableSupplementaryViewOfKind(kind, withReuseIdentifier: "footer", forIndexPath: indexPath) as! footerCell

        footerView.backgroundColor = UIColor.greenColor();
        return footerView

    default:

        assert(false, "Unexpected element kind")
    }
}

希望有人能帮上忙。


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2020-07-07

共1个答案

小编典典

您可以制作一个UICollectionViewController来处理UICollectionView和在Interface Builder中激活
FooterHeader 部分,然后可以在UICollectionView添加的两个部分中使用以下方法进行预览:

override func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {

    switch kind {

    case UICollectionView.elementKindSectionHeader:

        let headerView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "Header", for: indexPath)

        headerView.backgroundColor = UIColor.blue
        return headerView

    case UICollectionView.elementKindSectionFooter:
        let footerView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "Footer", for: indexPath)

        footerView.backgroundColor = UIColor.green
        return footerView

    default:

        assert(false, "Unexpected element kind")
    }

在上面的代码我把identifier页脚和头作为HeaderFooter例如,你可以做你想要的。如果要创建自定义页眉或页脚,则需要UICollectionReusableView为每个页眉创建一个子类并根据需要对其进行自定义。

您可以通过以下方式在Interface Builder或代码中注册自定义页脚和标头类:

registerClass(myFooterViewClass, forSupplementaryViewOfKind: UICollectionElementKindSectionFooter, withReuseIdentifier: "myFooterView")
2020-07-07