swift - 如何更改 UIAlertController 高度？

Question

我创建了一个 UIAlertController

let alertC = UIAlertController(title: "Title", message: "Message", preferredStyle: UIAlertControllerStyle.Alert)
alertC.addTextFieldWithConfigurationHandler(addTextField)
alertC.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Default, handler: nil))
alertC.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: okButton))
presentViewController(alertC, animated: true, completion: nil)

但在那之后我想改变 UIAlertController 的高度？我该怎么做？

Answer 1

我发现您可以在呈现 View Controller 之前添加约束

 let alertController = UIAlertController(title: nil, message: "hello", preferredStyle: .alert)
    
    
    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (action) in
        // hide action sheet
    }
    alertController.addAction(cancelAction)
    
   
    var height:NSLayoutConstraint = NSLayoutConstraint(
        item: alertController.view, attribute: NSLayoutConstraint.Attribute.height,
        relatedBy: NSLayoutConstraint.Relation.equal, toItem: nil, 
        attribute: NSLayoutConstraint.Attribute.notAnAttribute, 
        multiplier: 1, constant: self.view.frame.height * 0.80)
    alertController.view.addConstraint(height);
    self.present(alertController, animated: true, completion: nil)