DidselectRow委托方法无法快速运行

Question

I have an alert in which I have used table view to show some data.

User can select any item from the table view data.

Now when I'm trying to select any item in didSelectRow method it isn't selecting an item. I have used breakpoints also but it isn't catching the breakpoints also.

I have given its delegates and datasources everything is fine but i'm confused why it isn't working?

My code is this:

extension YourOrdersViewController : UITableViewDelegate, UITableViewDataSource{
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

        return PreOrderService.instance.PreOrderModelInstance.count
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        print("Hello")
        print(PreOrderService.instance.PreOrderModelInstance[indexPath.row].perorder_time)
    }

    func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
        if tableView == orderTableView{
            print("Dishes")
        }
        else{
            orderTableView.cellForRow(at: indexPath)?.accessoryType = .none
        }
    }

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

        let cell = orderTableView.dequeueReusableCell(withIdentifier: "orderCell", for: indexPath) as!
    PreOrderTableViewCell

        cell.titleLbl.text = PreOrderService.instance.PreOrderModelInstance[indexPath.row].perorder_time
        print(cell.titleLbl.text!)
        cell.selectionStyle = .none
        cell.selectionStyle = UITableViewCellSelectionStyle.none
        cell.accessoryType = cell.isSelected ? .checkmark : .none
        return cell
    }
}

View Controller looks like this, enter image description here

Answer 1

Check or you have set this value: If No Selection is set instead of Single Selection , the func tableView (_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) method will not be executed.

Answer 2

Does it have any gesture recognizer on your UIViewControlller. If it does and the gesture recognizer is above your table views on responder chain, it will take any single touch and leave nothing for your table views.

Answer 3

Whole problem in your code I think is:

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    self.tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark

}

func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {

    self.tableView.cellForRow(at: indexPath)?.accessoryType = .none

}

Answer 4

Make sure that the delegate and datasource are set. If you're creating the views via storyboard, make sure that you set the iboutlets for delegate/datasource.

Both of these lines mean the same thing: so remove the second one.

cell.selectionStyle = .none
cell.selectionStyle = UITableViewCellSelectionStyle.none

Answer 5

在Main.storyboard中选择您的表视图，然后在“属性检查器”中将选择更改为单个选择