UIAlertController-更改文本字段的大小并在它们之间添加空间

我的警报如下:

是否可以增大输入并在它们之间增加空间?这是我的代码片段.我尝试更改第二个文本字段的frame属性，但没有帮助:

Is it possible to make inputs bigger and add space between them? Here is a snippet from my code. I tried changing the frame property of the second text field but it didn't help:

let alert = UIAlertController(title: title, message: message, preferredStyle: .Alert)

// Add the textfields
alert.addTextFieldWithConfigurationHandler({ (textField) -> Void in
  textField.placeholder = "Vaše jméno"

})

alert.addTextFieldWithConfigurationHandler({ (textField) -> Void in
  textField.placeholder = "Společné heslo"

  var oldFrame = textField.frame
  oldFrame.origin.y = 40
  oldFrame.size.height = 60
  textField.frame = oldFrame
})