如何更改按钮的文字大小？

Question

我需要更改文字的大小。我该怎么做？这是我的代码：

  let playAgain: UIButton = UIButton(frame: CGRectMake(140, 400, 100, 50))
  playAgain.setTitle("Play Again", forState: UIControlState.Normal)


  playAgain.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
  playAgain.tag = 1
  self.view!.addSubview(playAgain)

Answer 1

设置按钮的titleLabel.font属性。

playAgain.titleLabel!.font =  UIFont(name: "Helvetica", size: 20)

Answer 2

如果您想在保持字体原样的同时只改变字体的大小，可以使用：

playAgain.titleLabel.font = UIFont(name: playAgain.titleLabel.font.fontName, size: /*whatever size you like*/ )

Answer 3

要更改按钮的字体，您必须访问titleLabel属性。

playAgain.titleLabel!.font = //... the font you want to use

UIButton的文档中对此进行了解释。

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIButton_Class/