Question

所以我想在我的UIcollectionView中添加广告。在每个第四个文件夹之后，我想要显示一个广告（总共3次，因此第4,9和14行）。

我尝试过以下方法：

  override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        if indexPath.row == 4 || indexPath.row == 9 || indexPath.row == 14 {
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "AdUnitsCollectionViewCell", for: indexPath) as? AdUnitsCollectionViewCell
            //cell?.addSubview(AdUnitController().getBannerView(2))
            //cell?.view = AdUnitController().getBannerView(2)
            cell?.view.adUnitID = "/6499/example/banner"
            cell?.view.rootViewController = self
            cell?.view.load(DFPRequest())
            return cell!
        } else {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: FolderViewCellIdentifier, for: indexPath) as? FolderViewCell
        cell!.configure(folders![indexPath.row])
        return cell!
        }
    }

这确实在每个第四个文件夹后显示广告3次，但现在我的文件夹不再显示（4,9和14）。有没有办法在收藏夹和我的文件夹中添加广告？

谢谢！

Answer 1

首先，如果你想在集合视图中添加它（必须是total_folder + total_add），你必须增加项目/行的总数，但是作为 @bhmahler说：只需添加行数是还不够，你需要考虑负偏移

你可以做的是你可以计算它在 if block 里面的时间，如果它进入这个区块增加了计数

else {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: FolderViewCellIdentifier, for: indexPath) as? FolderViewCell
        cell!.configure(folders![indexPath.row-count])
        return cell!
    }

现在在你的else块中你可以简单地减去索引路径中的计数，就像这样

{
"name": "SemanticModel",
"compatibilityLevel": 1200,
"model": {
"culture": "en-US",
"dataSources": [
  {
    "name": "BlahDW",
    "connectionString": "Provider=SQLOLEDB;Data Source=sql.blah.com;Persist Security Info=false;Integrated Security=SSPI;Initial Catalog=Blah",
    "impersonationMode": "impersonateAccount",
    "account": "blah\\blah",
    "annotations": [
      {
        "name": "ConnectionEditUISource",
        "value": "SqlServer"
      }
    ]
  }
],
"tables": [
  {
    "name": "Employees",
    "isHidden": true,
    "columns": [
      {
        "name": "Employee Key",
        "dataType": "int64",
        "isHidden": true,
        "isUnique": true,
        "isNullable": false,
        "sourceColumn": "Employee Key"
      },
      {
        "name": "Employee Code",
        "dataType": "string",
        "isHidden": true,
        "sourceColumn": "Employee Code"
      },
      {
        "name": "Employee Name",
        "dataType": "string",
        "isHidden": true,
        "sourceColumn": "Employee Name"
      },
      {
        "name": "Home Village Code",
        "dataType": "string",
        "isHidden": true,
        "sourceColumn": "Home Village Code"
      }
    ],
....

确保在集合视图委托方法

之外设置 count = 0

对不完整的代码感到抱歉，因为我不知道swift。希望它有帮助

Answer 2

如果您要同时展示广告 AND 文件夹，则需要增加行数

override func numberOfItems(inSection section: Int) -> Int {
   let count = //the count you were using before
   return count + floor(count/4) //add an ad every 4
}

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    if indexPath.row % 4 == 0 && indexPath.row > 0 {  //assuming you don't want an ad as the first item
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "AdUnitsCollectionViewCell", for: indexPath) as? AdUnitsCollectionViewCell
        //cell?.addSubview(AdUnitController().getBannerView(2))
        //cell?.view = AdUnitController().getBannerView(2)
        cell?.view.adUnitID = "/6499/example/banner"
        cell?.view.rootViewController = self
        cell?.view.load(DFPRequest())
        return cell!
    } else {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: FolderViewCellIdentifier, for: indexPath) as? FolderViewCell
        cell!.configure(folders![indexPath.row])
        return cell!
    }
}

修改

更全面的方法是修改您的folders数组（？）以支持AdUnitsCollectionViewCell和FolderViewCell数据。
例如，如果folders是一个结构数组

struct CellData { static enum CellDataType { case folder case ad } let type: CellDataType let data: //some type - you haven't shown whats required }

需要有一种方法可以将每4个广告注入folders数组，然后您可以启用folders[indexPath.row].type来决定是否要显示广告单元格或文件夹单元格。您也不需要修改numberOfItemsInSection方法。

每隔x个单元UICollectionView不同的单元格

2 个答案: