SWIFT

delay code execution swift 5

let timer = 1

DispatchQueue.main.asyncAfter(deadline: .now() + timer) {
    // code to execute after 1 second
}

delay code execution swift 4

var dispatchAfter = DispatchTimeInterval.seconds(1)

DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + dispatchAfter, execute: {
    // Do your thing
})