UIAlertController中的多行可编辑文本UITextview？

Posted 2021-04-13

如何在UITextview中制作多行可编辑文本UIAlertController？ UITextfield支持单行，我们需要在弹出窗口中创建一个多行文本编辑框。

答案

这是好方法......

func popUpController()
{

    let alertController = UIAlertController(title: "





", message: nil, preferredStyle: UIAlertController.Style.actionSheet)

    let margin:CGFloat = 8.0
    let rect = CGRect(x: margin, y: margin, width: alertController.view.bounds.size.width - margin * 4.0, height: 100.0)
    let customView = UITextView(frame: rect)

    customView.backgroundColor = UIColor.clear
    customView.font = UIFont(name: "Helvetica", size: 15)



    //  customView.backgroundColor = UIColor.greenColor()
    alertController.view.addSubview(customView)

    let somethingAction = UIAlertAction(title: "Something", style: UIAlertAction.Style.default, handler: {(alert: UIAlertAction!) in print("something")

        print(customView.text)

    })

    let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertAction.Style.cancel, handler: {(alert: UIAlertAction!) in print("cancel")})

    alertController.addAction(somethingAction)
    alertController.addAction(cancelAction)

    self.present(alertController, animated: true, completion:{})


}

另一答案

我对Vishal的方法进行了一些调整。

1. 添加了UITextViewDelegate方法，将初始浅灰色文本显示为占位符，并在textViewDidBeginEditing上将其删除。
2. 设置textView边框宽度，边框颜色和背景颜色以使其可见。 class ViewController: UIViewController, UITextViewDelegate { ... @IBAction func showAlert(sender: AnyObject) { let alertController = UIAlertController(title: "Hello, I'm alert! ", message: "", preferredStyle: .Alert) let rect = CGRectMake(15, 50, 240, 150.0) let textView = UITextView(frame: rect) textView.font = UIFont(name: "Helvetica", size: 15) textView.textColor = UIColor.lightGrayColor() textView.backgroundColor = UIColor.whiteColor() textView.layer.borderColor = UIColor.lightGrayColor().CGColor textView.layer.borderWidth = 1.0 textView.text = "Enter message here" textView.delegate = self alertController.view.addSubview(textView) let cancel = UIAlertAction(title: "Cancel", style: .Cancel, handler: nil) let action = UIAlertAction(title: "Ok", style: .Default, handler: { action in let msg = (textView.textColor == UIColor.lightGrayColor()) ? "" : textView.text print(msg) }) alertController.addAction(cancel) alertController.addAction(action) self.presentViewController(alertController, animated: true, completion: {}) } func textViewDidBeginEditing(textView: UITextView) { if textView.textColor == UIColor.lightGrayColor(){ textView.text = "" textView.textColor = UIColor.darkGrayColor() } } }

另一答案

以下代码适用于UITextView中的Multiline UIAlertController，写于Swift 4

    let alert = UIAlertController(title: "Enter your summary", message: "







", preferredStyle: .alert)
    alert.view.autoresizesSubviews = true

    let textView = UITextView(frame: CGRect.zero)
    textView.translatesAutoresizingMaskIntoConstraints = false

    let leadConstraint = NSLayoutConstraint(item: alert.view, attribute: .leading, relatedBy: .equal, toItem: textView, attribute: .leading, multiplier: 1.0, constant: -8.0)
    let trailConstraint = NSLayoutConstraint(item: alert.view, attribute: .trailing, relatedBy: .equal, toItem: textView, attribute: .trailing, multiplier: 1.0, constant: 8.0)

    let topConstraint = NSLayoutConstraint(item: alert.view, attribute: .top, relatedBy: .equal, toItem: textView, attribute: .top, multiplier: 1.0, constant: -64.0)
    let bottomConstraint = NSLayoutConstraint(item: alert.view, attribute: .bottom, relatedBy: .equal, toItem: textView, attribute: .bottom, multiplier: 1.0, constant: 64.0)
    alert.view.addSubview(textView)
    NSLayoutConstraint.activate([leadConstraint, trailConstraint, topConstraint, bottomConstraint])
    alert.addAction(UIAlertAction(title: "Done", style: .default, handler: { action in
        print("(String(describing: textView.text))")
    }))
    present(alert, animated: true)

另一答案

您无法在UIAlertController中创建多行textView。你必须为此创建自己的UIAlertController。