Question

我想显示一个弹出菜单，而不使用nib。我不喜欢使用nib，因为头痛实现了一个简单的功能委托。我成功使用modalPresentationStyle作为Popover将ViewController显示为Popover，并且可以使用以下代码正常工作。

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var btnShowPopOver: UIButton!
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    @IBAction func showPopUP(sender: AnyObject) {

        let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let popVC = storyboard.instantiateViewControllerWithIdentifier("pop")as! PopViewController
        popVC.modalPresentationStyle = UIModalPresentationStyle.Popover
        popVC.preferredContentSize = CGSizeMake(320, 240)
        popVC.popoverPresentationController!.delegate = self


        let popOverController = popVC.popoverPresentationController
        popOverController!.sourceView = sender as! UIView // where to stick the bar item in which view
        popOverController!.sourceRect = CGRectMake(70,30, 0, 0) //where to stick the bar

        popOverController?.permittedArrowDirections = nil
        self.presentViewController(popVC, animated: true, completion: nil)


    }




}


extension ViewController :UIPopoverPresentationControllerDelegate {

    func adaptivePresentationStyleForPresentationController(PC: UIPresentationController) -> UIModalPresentationStyle {
        return UIModalPresentationStyle.None
    }


    func popoverPresentationControllerDidDismissPopover(popoverPresentationController: UIPopoverPresentationController) {

        var controller = popoverPresentationController.presentedViewController as! PopViewController
         println(" this is data from pop view controller \(controller.textField.text)")

    }


}

Apple doc说