如何使按钮在 alertController 中可见？

Question

我在解决这个问题时遇到了一些问题。我在 alertcontroller 中看不到取消按钮和确定按钮，它们位于文本视图后面。我正在使用 textview，以便有更多 space 可以写。

这是我写的代码。

@IBAction func appltyButton(_ sender: Any) {

    let alertController = UIAlertController(title: "Write your message.", message: nil, preferredStyle: .alert)

    let rect        = CGRect(x: 15, y: 50, width: 240, height: 150.0)
    let textView    = UITextView(frame: rect)

    textView.font               = UIFont(name: "Helvetica", size: 15)
    textView.textColor          = UIColor.lightGray
    textView.backgroundColor    = UIColor.white
    textView.layer.borderColor  = UIColor.lightGray.cgColor
    textView.layer.borderWidth  = 1.0
    textView.text               = "Enter message here"
    textView.delegate           = self as? UITextViewDelegate

    alertController.view.addSubview(textView)

    let okAction = UIAlertAction(title: "OK", style: .default, handler: self.okHandler)
    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)

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

我希望能够看到按钮。谢谢

Answer 1

使用 .addTextField 将文本字段添加到您的提醒中。简单地添加子视图并不能像您预期的那样工作，并且也是明确的 discouraged:

Important

The UIAlertController class is intended to be used as-is and does not support subclassing. The view hierarchy for this class is private and must not be modified.

或者，使用允许更多自定义的众多警报库之一，例如SDCAlertView.

如何使按钮在 alertController 中可见？

How to make the buttons visible in the alertController?

xcode

uialertcontroller