[Solved] Reduce UserDefaults Integer Value – Swift

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First, obtain the old value of the high score. Then, do the arithmetic before finally saving the new value: 

let oldValue = UserDefaults.standard.integer(forKey: "HIGHSCORE")
let newValue = oldValue - 20

UserDefaults.standard.set(newValue, forKey: "HIGHSCORE")

solved Reduce UserDefaults Integer Value – Swift