为分组表视图中的每个部分添加阴影 [英] Add shadow to every section in grouped table view

问题描述

如图所示，我想在表视图部分添加阴影。就像表视图有4个部分那样在表视图中会有4个阴影视图。

As shown in image I want to add shadow to my table view sections. As like table view has 4 section then there would be 4 shadow view in table view.

func numberOfSections（在tableView：UITableView中） - > Int {
return 3}

func numberOfSections(in tableView: UITableView) -> Int { return 3 }

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return 3
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    switch processIndex {
        return cell
}

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return  44
}

func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        return UIView
}

func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 40
}

推荐答案

我尝试过自定义 [String：UIView] 。这将适用于最少的行数。如果您的单元设计是静态的，这将满足您的设计。如果你想访问 UITableViewCell 里面的一些属性，你必须使用子视图。

I have tried with custom [String : UIView] . This will work for minimum number of rows. If your cell's design is static, this will satisfy your design. If you want to access some property inside UITableViewCell, you have to go with subviews.

• 只有一行的多个部分。相应行中只有一个视图（ lookView ）。


• 我们必须创建n个 UIView 以编程方式根据需求。


• UITapGesture 到 TableView 。 TableView 格式为 Grouped ，分隔符为 .none 。

• Multiple section with only one row. Only one view (lookView) inside that respective row.
• We have to create n number of UIView programatically based on requirement.
• UITapGesture to TableView . TableView format is Grouped, Separator as .none.

以下代码会给出如下输出：

Following code will give output like:

//Global Variable:


@IBOutlet weak var tblVw: UITableView!

var rowItemsDict = [String : [String]]()
var rowHeight = [String : CGFloat]()
var eachRowSubViews = [String : UIView]()


override func viewDidAppear(_ animated: Bool) {

    rowItemsDict = ["0" : ["welcome", "hello", "wow", "Good", "Bad"], "1" : ["Asia", "Europe", "America"], "2" : ["Mcdonald", "Pizza", "Fries"]]

    for i in 0..<rowItemsDict.count
    {
        let numOfSubItemsArr : [String] = rowItemsDict[String(i)]!
        let eachRowHeight : CGFloat = getShadowViewHeight(defaultHeight: 44.0, numberOfItems: numOfSubItemsArr.count)

        var subArrView = UIView()

        for j in 0..<numOfSubItemsArr.count
        {
            let sublabel = UILabel(frame: CGRect(x: 0, y: 0, width: tblVw.frame.size.width - 42, height: 39))
            sublabel.text = numOfSubItemsArr[j]
            sublabel.isUserInteractionEnabled = true
            sublabel.textAlignment = .right
            sublabel.textColor = UIColor.red
            let subView = UIView(frame: CGRect(x: 0, y: CGFloat((j * 40)), width: tblVw.frame.size.width, height: 39))
            subView.addSubview(sublabel)
            subView.backgroundColor = UIColor.clear
            subView.tag = ((i+1) * 100) + j

            if j == (numOfSubItemsArr.count - 1)
            {

            }
            else
            {
                let LinesubView = UIView(frame: CGRect(x: 0, y: 38, width: tblVw.frame.size.width - 8, height: 1))
                LinesubView.backgroundColor = UIColor.lightGray.withAlphaComponent(0.2)
                subView.addSubview(LinesubView)
            }

            subView.isUserInteractionEnabled = true
            subArrView.addSubview(subView)
            subArrView.isUserInteractionEnabled = true
        }

        eachRowSubViews[String(i)] = subArrView
        rowHeight[String(i)] = eachRowHeight
    }

    let tapGesture = UITapGestureRecognizer(target: self, action: #selector(tapEachView))
    tblVw.addGestureRecognizer(tapGesture)
    tblVw.reloadData()
}


// TABLEVIEW DELEGATES
func numberOfSections(in tableView: UITableView) -> Int {


    return rowItemsDict.count
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! SampleTableViewCell

    print("\n\ncellFor")
    cell.backgroundColor = UIColor(red: 240/255, green: 240/255, blue: 240/255, alpha: 0.0)
    cell.separatorVw.backgroundColor = UIColor(red: 250/255, green: 250/255, blue: 250/255, alpha: 0.0)
    tableView.clipsToBounds = true
    let gettingVw : UIView = eachRowSubViews[String(indexPath.section)]!
    cell.lookVw.addSubview(gettingVw)
    cell.lookVw.layer.cornerRadius = 10
    cell.separatorVw.backgroundColor = UIColor.clear

    cell.selectionStyle = .none
    return cell
}


func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {

    let cell = cell as! SampleTableViewCell

    cell.lookVw.dropOnlyOneShadowLeft(getSize: CGSize.zero)
    cell.lookVw.backgroundColor = UIColor.white


}

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {

    return (rowHeight[String(indexPath.section)]! )

}


//ROW HEIGHT CALCULATION
func getShadowViewHeight(defaultHeight: CGFloat, numberOfItems: Int) -> CGFloat
{
    let requiredHeight = CGFloat(Int(defaultHeight) * numberOfItems)

    return requiredHeight
}

//TAP GESTURE ACTION
@objc func tapEachView(sender: UITapGestureRecognizer)
{
    let touchPoint = sender.location(in: tblVw)
    let index = tblVw.indexPathForRow(at: touchPoint)

    if (index == nil)
    {
            print("long press on table view but not on a row");
    }
    else
    {
        let cell = tblVw.cellForRow(at: index!) as! SampleTableViewCell
        let pointInCell = cell.convert(touchPoint, from: tblVw)

        let innerSubVw = cell.lookVw.subviews
        print("pointInCellpointInCell)  ", pointInCell)
        for sVw in innerSubVw[0].subviews
        {
            let pointY = pointInCell.y - 5
            let comparePoint = sVw.frame.origin.y

            if pointY >= comparePoint && pointY <= comparePoint + 39
            {
                print("sVwsVwsVwsVwsVw    ", sVw.tag)

                //DO YOUR ACTION IN RESPECTIVE VIEW CLICK
                return
            }

        }

    }
}


extension UIView {
    func dropOnlyOneShadowLeft(getSize: CGSize) {
        self.layer.shadowColor = UIColor.lightGray.cgColor
        self.layer.shadowOpacity = 0.6
        self.layer.shadowOffset = getSize
        self.layer.shadowRadius = 3
    }
}

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