我正在尝试调用一个带有文本字段的警报控制器。但是我想立即显示数字键盘,因为用户只能输入数字。我尝试了以下代码,但它不起作用。
let alert = UIAlertController(title: "New Rating", message: "Rate this!", preferredStyle: UIAlertControllerStyle.Alert)
let cancelAction = UIAlertAction(title: "Cancel", style: .Default, handler: { (action: UIAlertAction!) in })
let saveAction = UIAlertAction(title: "Save", style: .Default, handler: { (action: UIAlertAction!) in
let textField = alert.textFields![0] as UITextField
textField.keyboardType = UIKeyboardType.NumberPad
self.updateRating(textField.text)
})
alert.addTextFieldWithConfigurationHandler { (textField: UITextField!) in }
alert.addAction(cancelAction)
alert.addAction(saveAction)
self.presentViewController(alert, animated: true, completion: nil)
UIKeyboardType.numberPad
。 - Michael Volo