ios - 在 Swift 中从 UIButton 创建弹出窗口

Question

我想从 UIButton 创建一个大约 50x50px 的小弹出窗口。我已经看到使用自适应 segue 的方法，但我的尺寸等级已关闭，这意味着我无法使用此功能!

我还能如何创建这个弹出窗口？我可以使用我的按钮 IBACtion 中的代码创建它吗？或者还有什么方法可以用 Storyboard做到这一点吗？

Answer 1

您可以执行以下两个选项之一:

• 在您的 UIViewController 中为 UIButton 创建一个 Action ，并在里面呈现您想要的 ViewController 就像一个 Popover 和您的 UIViewController 必须实现协议(protocol) UIPopoverPresentationControllerDelegate，看看下面的代码:

  @IBAction func showPopover(sender: AnyObject) {
  
      var popoverContent = self.storyboard?.instantiateViewControllerWithIdentifier("StoryboardIdentifier") as! UIViewController
  
      popoverContent.modalPresentationStyle = .Popover
      var popover = popoverContent.popoverPresentationController
  
      if let popover = popoverContent.popoverPresentationController {
  
         let viewForSource = sender as! UIView
         popover.sourceView = viewForSource
  
         // the position of the popover where it's showed
         popover.sourceRect = viewForSource.bounds
  
         // the size you want to display
         popoverContent.preferredContentSize = CGSizeMake(200,500)
         popover.delegate = self
      }            
  
      self.presentViewController(popoverContent, animated: true, completion: nil)
  }
  
  func adaptivePresentationStyleForPresentationController(controller: UIPresentationController) -> UIModalPresentationStyle {
     return .None
  }
  

  根据@matt Programming iOS 8 的书:

  A popover presentation controller, in iOS 8, is a presentation controller (UIPresentationController), and presentation controllers are adaptive. This means that, by default, in a horizontally compact environment (i.e. on an iPhone), the .Popover modal presentation style will be treated as .FullScreen. What appears as a popover on the iPad will appear as a fullscreen presented view on the iPhone, completely replacing the interface.

  要在 iPhone 中避免这种行为，您需要实现委托(delegate)方法 adaptivePresentationStyleForPresentationController在您的 UIViewController 中正确显示 Popover。

• 我认为另一种方法更容易做到，它是使用 Interface Builder，只需从 UIButton 安排到 ViewController你想要的，并在 segue 中选择 Popover segue。

希望对你有帮助