UIAlertController - 更改文本字段的大小并在它们之间添加空格

我的提醒如下：

是否可以使输入更大并在它们之间增加空间？这是我的代码示例。我试图更改第二个textField的frame属性，但它没有帮助：

Is it possible to make inputs bigger and add space between them? Here is example of my code. I tried to change frame property of second textField 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
})