Rounding a double value to x number of decimal places in swift

Can anyone tell me how to round a double value to x number of decimal places in Swift? I have: var totalWorkTimeInHours = (totalWorkTime/60/60) With totalWorkTime being an NSTimeInterval (double) in second. totalWorkTimeInHours will give me the hours, but it gives me the amount of time in such a long precise number e.g. 1.543240952039…… How … Read more