如果 swift 中的数字超过“10”，如何删除小数点

Question

How to remove decimal point value if the number is more than 10.0. Below is the code what i have tried. At below code i am getting the value and i put the condition that if value is less than 1km then show number in meter, if value is more than 1 then show the number in km and if the value is greater than 10.0 then i am not able to remove the decimal point

let resultDelivery = String(format: "%.1f", Obj.distance)// Here getting value from api either i get 0.5 or 6.5 or 11.5
            if (resultDelivery.starts(with: "0")){
                let resultDelivery2 = String(format: "%.f", Obj.distance/1 * 1000)
                cell.lblDeliverykm?.text = resultDelivery2.description + " " + "m".Localized() + "  " + "" // result is 900 m
            }
            else if (resultDelivery.starts(with: "10.0")){
                let resultDelivery2 = String(format: "%.0f", Obj.distance)
                cell.lblDeliverykm?.text = resultDelivery2.description + " " + "km".Localized() + "  " + "" // couldn’t able to remove decimal point 
            }
            else {
                cell.lblDeliverykm?.text = resultDelivery.description + " " + "km".Localized() + "  " + "" // result is 8.6 km
            }

Answer 1

Ah the joys of C-style formatting strings.

I present this as an alternative approach:

extension String.StringInterpolation
{
    public mutating func appendInterpolation<F: BinaryFloatingPoint>(distance: F)
    {
        if distance < 1 {
            appendLiteral("\(Int(distance * 1000))m")
        }
        else if distance >= 10 {
            appendLiteral("\(Int(distance))km")
        }
        else
        {
            let d = (distance * 10).rounded(.toNearestOrEven) / 10
            appendLiteral("\(d)km")
        }
    }
}


print("\(distance: 0.1)")
print("\(distance: 1)")
print("\(distance: 10)")
print("\(distance: 100)")

The output is

100m
1.0km
10km
100km

This will accept Double , Float , Float80 , Float16 and any other type conforming to BinaryFloatingPoint .

If you want localizable formats, look into NumberFormatter .

[EDIT] as noted by @flanker in comments, LengthFormatter with its method, string(from: String, unit: LengthFormatter.Unit) -> String would be the way to go rather than NumberFormatter