Add 2 float values in UILabel from 2 difference functions

Question

I'm new to Swift and I'm stuck with this simple issue, hope someone can help.

I'm trying to assign float value to 2 UILabels deliveryCollectionLabel and adminFeeLabel with if logic in 2 different functions as shown below and then on third function named totalCost I'm trying to add them values but I'm getting an error:

Binary operator '+' cannot be applied to two '()' operands

first question: is below the correct way to assign a Float value to labels deliveryCollectionLabel and adminFeeLabel?

secondly: what is the correct way to add values of these 2 functions into Float which will be used to add to another float value later on in the code?

private func deliveryCharge() {
    if deliveryCollectionLabel.text! == "Delivery" {
        deliveryChargeLabel.text! = "2.50"
    } else {
        deliveryChargeLabel.text! = "0.00"
    }
}
private func adminFee () {
    adminFeeLabel.text! = "0.50"
}
private func totalCost() {
   var totalOrderCost = 0
    totalOrderCost = deliveryCharge() + adminFee()
}

Answer 1

You can use it that way.

private func getDeliveryCharge() -> Double {
    if deliveryCollectionLabel.text! == "Delivery" {
         return 2.50
    }
  return 0.0
}

private func getAdminFee() -> Double {
    return 0.50
}

private func getTotalCost() -> Double {
  return getDeliveryCharge() + getAdminFee()
}

[USE]:

deliveryChargeLabel.text = "\(getDeliveryCharge())"
adminFeeLabel.text = "\(getAdminFee())"
print("\(getTotalCost())")

I hope it helps.