SwiftyHealthKit.stepCount(at: Date()) { result in
    switch result {
    case .failure(let error): print("\(error)")
    case .success(let step): print("Steps of today: \(step)")
    }
}

SwiftyHealthKit.quantity(at: Date(), id: .bodyMass, option: .discreteMax) { result in
    switch result {
    case .failure(let error): print("\(error)")
    case .success(let quantity):
        guard let quantity = quantity else {
            // No bodymass data for today
            return
        }
        
        let kilogram = quantity.doubleValue(for: HKUnit.gramUnit(with: .kilo))
        print("Max bodymass of today: \(kilogram)kg")
        
        let pound = quantity.doubleValue(for: HKUnit.pound())
        print("Max bodymass of today: \(pound)lb")
    }
}

let unit = HKUnit.gramUnit(with: .kilo)
let quantity = HKQuantity(unit: unit, doubleValue: 60)

SwiftyHealthKit.writeSample(at: Date(), id: .bodyMass, quantity: quantity) { result in
    if case .failure(let error) = result {
        print("Error: \(error)")
        return
    }

    print("Write success!")
}