为什么消息没有显示？

Question

我创建了一个弹出窗口，但没有显示任何内容，我添加了UIViewControllers作为弹出窗口。为什么不起作用？ http://puu.sh/hreL9/75081b2a90.png

class interestViewController: UIViewController, UIPopoverPresentationControllerDelegate {
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "popoverSegue" {
        let interestViewController = segue.destinationViewController as! UIViewController
        interestViewController.modalPresentationStyle = UIModalPresentationStyle.Popover
        interestViewController.popoverPresentationController!.delegate = self
    }
}
func adaptivePresentationStyleForPresentationController(controller: UIPresentationController) -> UIModalPresentationStyle {
    return UIModalPresentationStyle.None
}

Answer 1

我相信在这种情况下你不需要一个segue。您可以使用下面列出的示例。按下按钮时，它会从按钮显示弹出窗口。

import UIKit

class ViewController: UIViewController, UIPopoverPresentationControllerDelegate {

  var myPopover : UIPopoverPresentationController?

  @IBAction func buttonPressed(sender: UIButton) {
    // you can init your own View Controller here
    var popOverView = self.storyboard?.instantiateViewControllerWithIdentifier("interestViewController‌​") as! interestViewController
    popOverView.preferredContentSize = CGSize(width: 250, height: 200);
    var destNav = UINavigationController(rootViewController: popOverView)
    destNav.modalPresentationStyle = UIModalPresentationStyle.Popover
    self.myPopover = destNav.popoverPresentationController
    self.myPopover?.delegate = self
    self.myPopover?.sourceView = self.view
    var theFrame = sender.frame
    self.myPopover?.sourceRect = theFrame
    destNav.modalPresentationStyle = UIModalPresentationStyle.Popover
    destNav.navigationBarHidden = true
    self.presentViewController(destNav, animated: true, completion: nil)

  }

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

}