Heartrate with no decimal places

Question

Im doing a watch app for the Apple Watch in Xcode and the sample code from the Apple Developer site SpeedySloth: Creating a Workout has the HeartRate rounded to one decimal place, e.g. 61.0 How can I fix this?

case HKQuantityType.quantityType(forIdentifier: .heartRate):
                /// - Tag: SetLabel
                let heartRateUnit = HKUnit.count().unitDivided(by: HKUnit.minute())
                let value = statistics.mostRecentQuantity()?.doubleValue(for: heartRateUnit)
                let roundedValue = Double( round( 1 * value! ) / 1 )
                label.setText("\(roundedValue) BPM")

I tried changing both the 1's in there to 0 but that gave me a 6.1 BPM or a 0.0 BPM

Thanks

Answer 1

A simple solution is to round to an integer and show the integer.

let value = // ... some Double ...
let s = String(Int(value.rounded(.toNearestOrAwayFromZero)))
label.setText(s + " BPM")

Properly, however, you should put formatting a string based on a number into the hands of a NumberFormatter. That's its job: to format a number.

let i = value.rounded(.toNearestOrAwayFromZero)
let nf = NumberFormatter()
nf.numberStyle = .none
let s = nf.string(from: i as NSNumber)!
// ... and now show the string