Swift如何獲得UIAlertController標題高度

目前我正在使用UIAlertController在swift中。我正在嘗試將活動指示器添加到警報控制器。我找到了以下解決方案，但是當標題大於一行時，微調控件和標題重疊。爲此我想，我需要知道標題標籤的高度。Swift如何獲得UIAlertController標題高度

let spinner = UIActivityIndicatorView(activityIndicatorStyle: .gray) 
spinner.center = CGPoint(x: 130.5, y: 65.5) 
spinner.startAnimating() 
alert.view.addSubview(spinner)

有人請幫助我一個適當的解決方案。

來源

2017-07-19 Abdullah

據我所知，不可能訪問標題高度。在警報視圖中添加自定義UIView很容易，然後在自定義視圖上添加標題標籤，微調框，消息標籤。

  let alert = UIAlertController(title: " ", message: " ", preferredStyle: UIAlertControllerStyle.alert) 
      let customViewWidth: CGFloat = 270 
      let viewRect = CGRect(x: 0, y: 0, width: customViewWidth, height: 150) 
      let customView = UIView(frame: viewRect) 
      customView.backgroundColor = UIColor.white 
      customView.layer.cornerRadius = 20.0 
      customView.clipsToBounds = true 

      var spinnerTopPadding: CGFloat = 17.0 
      if(!title.isEmpty) { 

       let titleRect = CGRect(x: 13.0, y: 17.0, width: customViewWidth - 26, height: 100) 
       let titleLabel = UILabel(frame: titleRect) 
       titleLabel.textAlignment = .center 
       titleLabel.numberOfLines = 0 
       titleLabel.font = titleLabel.font(withSize: 17.0) 
       titleLabel.lineBreakMode = .byWordWrapping 
       titleLabel.text = title 
       titleLabel.sizeToFit() 
       titleLabel.center = CGPoint(x: customViewWidth/2, y: titleLabel.frame.size.height/2 + 17.0) 
       customView.addSubview(titleLabel) 
       spinnerTopPadding = titleLabel.frame.size.height + 27 
      } 

      let spinner = UIActivityIndicatorView(activityIndicatorStyle: .gray) 
      spinner.center = CGPoint(x: customViewWidth/2, y: spinnerTopPadding + spinner.frame.size.height/2) 
      spinner.startAnimating() 
      customView.addSubview(spinner) 

      var messageText = message.replacingOccurrences(of: "\n\n", with: "") 
      messageText = message.replacingOccurrences(of: "\n", with: "") 
      var spinnerBottomPadding: CGFloat = 17.0 
      if (!message.isEmpty) { 

       let messageRect = CGRect(x: 13.0, y: spinnerTopPadding + spinner.frame.size.height + 10.0, width: customViewWidth - 26, height: 100) 
       let messageLabel = UILabel(frame: messageRect) 
       messageLabel.textAlignment = .center 
       messageLabel.numberOfLines = 0 
       messageLabel.font = messageLabel.font(withSize: 14.0) 
       messageLabel.lineBreakMode = .byWordWrapping 
       messageLabel.text = messageText 
       messageLabel.sizeToFit() 
       messageLabel.center = CGPoint(x: customViewWidth/2, y: spinnerTopPadding + spinner.frame.size.height + messageLabel.frame.size.height/2 + 10) 
       customView.addSubview(messageLabel) 
       spinnerBottomPadding = messageLabel.frame.size.height + 27 
      } 

      customView.frame.size.height = spinnerTopPadding + spinner.frame.size.height + spinnerBottomPadding 
      alert.view.addSubview(customView) 
      let alertControllerHeight = NSLayoutConstraint(item: alert.view, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: customView.frame.size.height) 
      let alertControllerWidth = NSLayoutConstraint(item: alert.view, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: customViewWidth) 
      alert.view.addConstraint(alertControllerHeight) 
      alert.view.addConstraint(alertControllerWidth) 
      let alertContainer = alert.view.subviews.first!.subviews.first! 
      for container in alertContainer.subviews { 
       container.backgroundColor = UIColor.white 
       container.layer.cornerRadius = 20.0 
      } 
      self.present(alert, animated: true, completion: nil)

來源

2017-08-07 06:54:47 Abdullah

Swift如何獲得UIAlertController標題高度

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