ios - 如果json数据为零，如何在tableview中隐藏单元格

Question

如果 json 数据为 nil，如何隐藏部分中的单元格 Collection View 。我在表格 View 单元格中加载 Collection View 。我的代码在下面我在 Collection View 中显示图像数组我使用第三方进行水平自动滚 Action 为 Collection View 的第三方

func setCollectionData(_collectionData: [Any]) {
    self.collectionData = _collectionData as NSArray      
    collectionViewObj.setContentOffset(CGPoint(x:0,y:0), animated: true)       
    for i in 0 ..< collectionData.count {
        self.strings = StringClass()
        self.strings.vehicleImage = (collectionData[i] as AnyObject).value(forKey: "img_name") as? String                        
        self.strings.vehicleTitle=(collectionData[i] as AnyObject).value(forKey: "p_name") as? String                  
        self.modelArray.append(self.strings)                        
    }    
    collectionViewObj.reloadData()
}            
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
{
    if self.collectionData.count >= 4 {
        return 4
    }
    else
    {
    return collectionData.count
    }
}    

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
{
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ProductCollectionViewCustomCell", for: indexPath)as! ProductCollectionViewCustomCell        
    strings = modelArray[indexPath.row]        
    cell.ProductTitleLabel.text =  strings.vehicleTitle        
    let URLBaseString = "http://vehiclebuzzzz.com/"        
    let url = URL(string:URLBaseString .appending(strings.vehicleImage!))        
    let dataurl = try? Data(contentsOf: url!)    
    cell.productImageViewObj.image=UIImage(data: dataurl!)                
    return cell
}

Answer 1

func collectionView(_ collectionView: UICollectionView,layout collectionViewLayout: UICollectionViewLayout,sizeForItemAt indexPath: IndexPath) -> CGSize 

覆盖此方法并返回零大小 CGSize.zero 如果 json 数据为 nil 否则返回单元格的实际大小

或

从数组中移除 nil 数据并调用 collectionView.reloadData()