UITapGesture in UITableview header

问题:

I trying to use expandable tableview in swift. So I added Gesture to header in tableview, but it does not recognising. Kindly guide me. Just cross check my coding.

MY CODING IS BELOW:

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

        let vvv = tableView.headerViewForSection(section)

        let tap = UITapGestureRecognizer(target: self, action: Selector("handleTap:"))
        tap.delegate = self
        vvv?.addGestureRecognizer(tap)
        return vvv
    }


    func handleTap(gestureRecognizer: UITapGestureRecognizer)
    {
        if(gestureRecognizer.state == .Ended)
        {
            println("SECTION PRESSED") //NOT ENTERING TO THIS BLOCK
        }     
    }

回答1:

In Swift 4 you can add a UITapGestureRecognizer to the header view:

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

    let headerView = UIView()

    let tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(headerTap))
    headerView.addGestureRecognizer(tapRecognizer)

    return headerView
}

@objc func headerTap() {
    // Tap action
}

回答2:

I did it this way.

First, make a UITableViewCell class with a "headerCellSection" variable (or whatever you want to call it for that matter).

import UIKit

class HeaderCellTableViewCell: UITableViewCell {

    var headerCellSection:Int?

    override func awakeFromNib() {
        super.awakeFromNib()
    }

    override func setSelected(selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)
    }
}

Add the cell to "viewForHeaderInSection":

func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        let headerCell = tableView.dequeueReusableCellWithIdentifier("headerCell") as! HeaderCellTableViewCell

        return headerCell
    }

Send the cell's section to the previously declared variable and add the tap gesture recogniser to the cell. The code should look something like this:

func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    let headerCell = tableView.dequeueReusableCellWithIdentifier("headerCell") as! HeaderCellTableViewCell

        // Send section
        headerCell.headerCellSection = section

        // Add gesture
        let headerTapGesture = UITapGestureRecognizer()
        headerTapGesture.addTarget(self, action: "myAction:")
        headerCell.addGestureRecognizer(headerTapGesture)

    return headerCell
}

Then add the action. In the action you can access the view that has the tap gesture target. There you can access tour "headerCellSection" value and voila!

func myAction (sender: UITapGestureRecognizer) {

    // Get the view
    let senderView = sender.view as! HeaderCellTableViewCell

    // Get the section
    let section = senderView.headerCellSection

    print(section)
}

回答3:

I did it by adding the UITapGestureRecognizer to the contentView of the headerView. Example:

headerCell.contentView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(headerTapped)))

回答4:

I know this is a bit old question to give an answer. But none of the answers accepted, I will give another simple solution.

After I read original question, I thought the author do not want a custom created section header. That's why he was trying to use following code.

let vvv = tableView.headerViewForSection(section)

But I'm sure you will get a null value for vvv in the above code snippet. If user wants to access the default view, he can do it as below.

tableView.register(UITableViewHeaderFooterView.self, forHeaderFooterViewReuseIdentifier: sectionHeaderIdentifier)

Above registration, I did in my viewDidLoad() function. Then use below code

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

    let sectionView: UITableViewHeaderFooterView = tableView.dequeueReusableHeaderFooterView(withIdentifier: sectionHeaderIdentifier)!
    let tapGesture = UITapGestureRecognizer(target: self, action: #selector(sectionHeaderTapped))
    sectionView.addGestureRecognizer(tapGesture)

    return sectionView
}

Above function will create the default view for your table section headers with the tap gesture attribute enabled.