如何在iOS 8 swift中更改Button文本大小

Question

I have got a button with a layout outletLeaderboard . I want to change his text size by the code, so this is what I wrote:

outletLeaderboard.font =  UIFont(name: outletLeaderboard.font.fontName, size: 37)

and then I get an error:

'font' is unavailable: APIs deprecated as of iOS 7 and earlier are unavailable in Swift

What is the correct line I need to write?

Answer 1

使用titleLabel而不是.font

outletLeaderboard.titleLabel!.font =  UIFont(name: "HelveticaNeue-Thin", size: 20)

Answer 2

尝试

outletLeaderboard.titleLabel?.font = UIFont(name: outletLeaderboard.font.fontName, size: 37)

Answer 3

Simply access the title label of the button. For example:

button.titleLabel?.font = UIFont(name: "Arial-MT", size: 15)

Answer 4

With Swift 3:

if let titleLabel = outletLeaderboard.titleLabel {
    titleLabel.font = UIFont(name: titleLabel.font.fontName, size: 16)
}

or even better an extension:

extension UIButton {
    func set(fontSize: CGFloat) {
        if let titleLabel = titleLabel {
             titleLabel.font = UIFont(name: titleLabel.font.fontName, size: fontSize)
        }
    }
}

Answer 5

When you've defined outletLeaderboard, make sure its of UIButton type.

var outletLeaderboard : UIButton = UIButton()
outletLeaderboard.titleLabel!.font = UIFont(name: "Consolas", size: 30)