ios - 如何在 UIAlertController 中使用 UITextView

Question

我使用警报 Controller 创建了一个弹出警报，并添加了两个警报操作(确定和取消)，如下所示。

UIAlertController * alert=   [UIAlertController
                              alertControllerWithTitle:@"Cycling"
                              message:@"Please enter title and description"
                              preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction* ok = [UIAlertAction
                     actionWithTitle:@"OK"
                     style:UIAlertActionStyleDefault
                     handler:^(UIAlertAction * action)
                     {
                         [alert dismissViewControllerAnimated:YES completion:nil];

                     }];
UIAlertAction* cancel = [UIAlertAction
                         actionWithTitle:@"Cancel"
                         style:UIAlertActionStyleDefault
                         handler:^(UIAlertAction * action)
                         {
                             [alert dismissViewControllerAnimated:YES completion:nil];

                         }];

[alert addAction:ok];
[alert addAction:cancel];

[self presentViewController:alert animated:YES completion:nil];

现在，我想添加 UITextView。因为我有两个文本字段，如标题和描述。对于描述，我想使用 UITextView 添加 no.of 行。我试过我不知道如何添加它。

请指教。

Answer 1

Johno2110 的解决方案经过一些清理和调整后对我来说效果最好。在这里发布代码和结果的屏幕截图，以防它帮助其他人。

确认使用 Swift 5。

let textView = UITextView(frame: CGRect.zero)

@IBAction func sendFeedback(_ sender: Any) {
    let alertController = UIAlertController(title: "Feedback \n\n\n\n\n", message: nil, preferredStyle: .alert)

    let cancelAction = UIAlertAction.init(title: "Cancel", style: .default) { (action) in
        alertController.view.removeObserver(self, forKeyPath: "bounds")
    }
    alertController.addAction(cancelAction)

    let saveAction = UIAlertAction(title: "Submit", style: .default) { (action) in
        let enteredText = self.textView.text
        alertController.view.removeObserver(self, forKeyPath: "bounds")
    }
    alertController.addAction(saveAction)

    alertController.view.addObserver(self, forKeyPath: "bounds", options: NSKeyValueObservingOptions.new, context: nil)
    textView.backgroundColor = UIColor.white
    textView.textContainerInset = UIEdgeInsets.init(top: 8, left: 5, bottom: 8, right: 5)
    alertController.view.addSubview(self.textView)

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

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    if keyPath == "bounds"{
        if let rect = (change?[NSKeyValueChangeKey.newKey] as? NSValue)?.cgRectValue {
            let margin: CGFloat = 8
            let xPos = rect.origin.x + margin
            let yPos = rect.origin.y + 54
            let width = rect.width - 2 * margin
            let height: CGFloat = 90

            textView.frame = CGRect.init(x: xPos, y: yPos, width: width, height: height)
        }
    }
}