xcode UICollectionView 中的多个部分

Multiple Section in UICollectionView

提问by christ2702

I was building an iOS app for my hospital using collection view. However, I need to use multiple sections for the specialist clinic depends on the purpose. I already completed the code if it's just for 1 section. when I try to make it 2 sections, it always returns a nil value.

我正在使用集合视图为我的医院构建一个 iOS 应用程序。但是，我需要为专科诊所使用多个部分，这取决于目的。如果只是 1 个部分，我已经完成了代码。当我尝试将它分成 2 个部分时，它总是返回一个 nil 值。

please check my code below

请在下面检查我的代码

public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)

    if indexPath.section == 0 {
        var buttonSpecialist = cell.viewWithTag(1) as! UIButton

        buttonSpecialist.setTitle(list[indexPath.row].SpecialtyName, for: .normal)

        let btnimg = try? UIImage(data: Data(contentsOf: URL(string: list[indexPath.row].ImageUrl)!))

        var newimg = imageResize(image: btnimg as! UIImage, scaledTo: CGSize(width: 50, height: 50))

        buttonSpecialist.setImage(newimg, for: .normal)
        buttonSpecialist.contentMode = .center
        buttonSpecialist.imageView?.contentMode = .scaleAspectFit

        //let sign: Int = imageOnTop ? 1 : -1
        let imageSize: CGSize? = buttonSpecialist.imageView?.frame.size
        buttonSpecialist.titleEdgeInsets = UIEdgeInsetsMake(((imageSize?.height)! + 5) * 1, -(imageSize?.width)!, 0, 0)
        let titleSize: CGSize? = buttonSpecialist.titleLabel?.bounds.size
        buttonSpecialist.imageEdgeInsets = UIEdgeInsetsMake(-((titleSize?.height)! + 5) * 1, 0, 0, -(titleSize?.width)!)

        cell.layer.borderWidth = 1.0
        cell.layer.borderColor = UIColor.black.cgColor
    }
    else if indexPath.section == 1 {
        var buttonSpecialist = cell.viewWithTag(1) as! UIButton

        buttonSpecialist.setTitle(list2[indexPath.row].SpecialtyName, for: .normal)

        let btnimg = try? UIImage(data: Data(contentsOf: URL(string: list2[indexPath.row].ImageUrl)!))

        var newimg = imageResize(image: btnimg as! UIImage, scaledTo: CGSize(width: 50, height: 50))

        buttonSpecialist.setImage(newimg, for: .normal)
        buttonSpecialist.contentMode = .center
        buttonSpecialist.imageView?.contentMode = .scaleAspectFit

        //let sign: Int = imageOnTop ? 1 : -1
        let imageSize: CGSize? = buttonSpecialist.imageView?.frame.size
        buttonSpecialist.titleEdgeInsets = UIEdgeInsetsMake(((imageSize?.height)! + 5) * 1, -(imageSize?.width)!, 0, 0)
        let titleSize: CGSize? = buttonSpecialist.titleLabel?.bounds.size
        buttonSpecialist.imageEdgeInsets = UIEdgeInsetsMake(-((titleSize?.height)! + 5) * 1, 0, 0, -(titleSize?.width)!)

        cell.layer.borderWidth = 1.0
        cell.layer.borderColor = UIColor.black.cgColor
    }

The main problem here is, I didn't know how to set the specific cell for the specific section. I already using 'IF' inside the function 'cellforindexpath', but it didn't worked.

这里的主要问题是，我不知道如何为特定部分设置特定单元格。我已经在函数“cellforindexpath”中使用了“IF”，但它没有用。

this is my return number of items in section

这是我在部分中返回的项目数

func numberOfSections(in collectionView: UICollectionView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 2
}


func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of items

    if section == 0 {
        return list.count
    }
        else if section == 1{
            return list2.count
        }

    return 0

}

please help me

请帮我

回答by Itachi Uchiha

Make sure assigning DataSource & Delegate to CollectionView

确保将 DataSource 和 Delegate 分配给 CollectionView

1.Give number of sections you wanna show using below method

1.使用以下方法给出要显示的部分数量

func numberOfSections(in collectionView: UICollectionView) -> Int {
    return 2
}

2.Set item count of each sections for CollectionView using below method.

2.使用以下方法为 CollectionView 设置每个部分的项目数。

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
   return (section == 0) ? list.count : list2.count
}

3.Assigning cell for each item to CollectionView.

3.将每个项目的单元格分配给CollectionView。

public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    //If you are using multiple cells based on section make condition 

     if indexPath.section == 0 {
             //make sure the identifier of your cell for first section
             let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell1", for: indexPath)
            // do your stuffs
             return cell
     }else{
             //make sure the identifier of your cell for second section
             let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell2", for: indexPath)
            // do your stuffs
             return cell
      }

}

回答by Krishna Kumar

If you have different cells layout requirement in that case you should use different custom cells with different reuse identifier. As I can see in your code you have same layout of cell with different datasource.

如果在这种情况下您有不同的单元格布局要求，您应该使用具有不同重用标识符的不同自定义单元格。正如我在您的代码中看到的，您具有相同的单元格布局和不同的数据源。

So I would say try to subclass the collectionview cell and put a IBOutlet property for button through xib or storyboard in the subclass.

所以我会说尝试对 collectionview 单元格进行子类化，并通过子类中的 xib 或故事板为按钮放置一个 IBOutlet 属性。

You can refer this question: how to create custom UICollectionViewCell

您可以参考这个问题： 如何创建自定义 UICollectionViewCell