Swift: Bolding UIButton

For a UIButton I tried this and works:

Swift 2

testButton.titleLabel?.font = UIFont.boldSystemFontOfSize(18)

Swift 3 & 4

testButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 18)

(Thank's to ConfusionTowers)

Swift 4+

button.titleLabel?.font = UIFont.systemFont(ofSize: 22.0, weight: .bold)

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