swift - popoverController 没有 seguing

Question

您好，我有一个显示数组的弹出 View 。我想知道是否有一种方法可以让我以某种方式返回选择了数组中的哪个项目。

 @IBAction func popOverButton(_ sender: UIButton)
{

    let controller = TableViewController()
    //This is just a regular tableViewController nothing special
     controller.modalPresentationStyle = .popover
    // configure the Popover presentation controller
    let popController: UIPopoverPresentationController? = controller.popoverPresentationController
    popController?.permittedArrowDirections = [.down]
    popController?.delegate = self
    popController?.sourceView = sender
    popController?.sourceRect = sender.bounds
    popController?.backgroundColor = .white
    self.parent?.present(controller, animated: true, completion: { })

}

Here is what it looks like

感谢任何帮助

Answer 1

最简单的方法是创建一个委托(delegate)，当一个单元格被选中时，将选择传递回呈现 View Controller 。然后设置 UITableViewDelegate 方法 didSelectRowAtIndexPath 以调用委托(delegate)方法。像这样:

@protocol  PopoverOptionSelectionDelegate {
    func itemSelected(item:String);
}

在您展示的 VC 中实现该方法

class PresnetingViewController, PopoverOptionSelectionDelegate {

    @IBAction func popOverButton(_ sender: UIButton) {
        let controller = TableViewController()
        controller.delegate = self //----Important---//
        //This is just a regular tableViewController nothing special
        controller.modalPresentationStyle = .popover
        // configure the Popover presentation controller
        let popController: UIPopoverPresentationController? = 
        controller.popoverPresentationController
        popController?.permittedArrowDirections = [.down]
        popController?.delegate = self
        popController?.sourceView = sender
        popController?.sourceRect = sender.bounds
        popController?.backgroundColor = .white
        self.parent?.present(controller, animated: true, completion: { })
    }

    func itemSelected(item:String) {

        //DISMISS YOUR POPOVER MAYBE AND DO SOMETHING WITH "ITEM" HERE
    }

}

class TableViewController,UITableViewDelegate {
    weak var delegate:PopoverOptionSelectionDelegate?

   func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        delegate?.itemSelected(self.itemsArray[indexPath.row])
   }
}