Displaying String based on 3 int values - ios

Question

I'm trying to display a string in this format
x day, y hr, z min
where x, y, z are Int values from user and user is required to send in at least 5 min if day and hr are 0.
This is my function where I handle displaying user input
func pickerTimeShow(day: Int, hour: Int, minutes: Int) -> String {
if day > 0 {
return "\(day) day, \(hour) hr, \(minutes) min"
}
if hour > 0 {
return "\(hour) hr, \(minutes) min"
}
return "\(minutes) min"
}
However, if user sends pickerTimeShow(day: 0, hour: 2, minutes: 0), my string will show
2 hr, 0 min
which is not idea because it supposes to just show
2 hr
In addition, if user sends pickerTimeShow(day: 5, hour: 0, minutes: 5), my string will show
5 day, 0 hr, 5 min
but I just want
5 day, 5 min
Do you have a simple solution to handle this case? I really can't think of anything else besides adding more if statement to check which makes my function really long. Thank you so much.

Answer 1

Here is one way to do it. Put the pieces into an array and then join them at the end:
func pickerTimeShow(day: Int, hour: Int, minutes: Int) -> String {
var result = [String]()
if day > 0 {
result.append("\(day) day")
}
if hour > 0 {
result.append("\(hour) hr")
}
if minutes > 0 {
result.append("\(minutes) min")
}
if result.isEmpty {
// decide what to return in the case that all are zero
return "0 min"
} else {
return result.joined(separator: ", ")
}
}
Tests:
pickerTimeShow(day: 0, hour: 0, minutes: 0) // "0 min"
pickerTimeShow(day: 5, hour: 0, minutes: 0) // "5 day"
pickerTimeShow(day: 0, hour: 6, minutes: 0) // "6 hr"
pickerTimeShow(day: 0, hour: 0, minutes: 7) // "7 min"
pickerTimeShow(day: 5, hour: 6, minutes: 0) // "5 day, 6 hr"
pickerTimeShow(day: 0, hour: 6, minutes: 7) // "6 hr, 7 min"
pickerTimeShow(day: 5, hour: 0, minutes: 7) // "5 day, 7 min"
pickerTimeShow(day: 5, hour: 6, minutes: 7) // "5 day, 6 hr, 7 min"

Answer 2

Alternatively – if you can live with 5 days rather than 5 day – this is a solution using DateComponentsFormatter
func pickerTimeShow(day: Int, hour: Int, minutes: Int) -> String? {
let dateComponents = DateComponents(day: day, hour: hour, minute: minutes)
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .short
formatter.allowedUnits = [.day, .hour, .minute]
return formatter.string(from: dateComponents)
}
The function returns nil if the input is out-of-order.