如何在Swift中的UIAlertController中更改UITextField的高度? [英] How can I change the height of UITextField in UIAlertController in Swift?

问题描述

我在UIAlertController中添加了UITextField.我想更改文本字段的高度.我已经尝试过这种方式:

I have added a UITextField in a UIAlertController. I want to change the height of the text field. I have tried this way:

let alertController = UIAlertController(title: "Comments", message: "Write your comments here", preferredStyle: UIAlertControllerStyle.alert)
alertController.addTextField { (textField : UITextField) -> Void in
    var frame: CGRect = textField.frame
    frame.size.height = 100
    textField.frame = frame
    textField.placeholder = "comment"
    print(textField.frame.size.height)
}

let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.cancel) { (result : UIAlertAction) -> Void in
}

let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) { (result : UIAlertAction) -> Void in
}

alertController.addAction(cancelAction)
alertController.addAction(okAction)
self.present(alertController, animated: true, completion: nil)

它不起作用.

推荐答案

这适用于约束.

alertController.addTextField { textField in
    let heightConstraint = NSLayoutConstraint(item: textField, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 100)
    textField.addConstraint(heightConstraint)
}

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