Swift DateComponentsFormatter drop leading zeroes but keep at least one digit in Minutes place

I am using the following DateComponentsFormatter in Swift:

let formatter = DateComponentsFormatter()
formatter.unitsStyle   = .positional
formatter.allowedUnits = [.hour, .minute, .second]
formatter.zeroFormattingBehavior = [.default]

This produces results like 2:41 (for 2 minutes and 41 seconds) and 08 (for 8 seconds). I would, however, like to keep at least one digit in the Minutes place, returning 0:08 instead of 08. Is this possible with the DateComponentsFormatter? I would prefer a solution that returns a localized result.

With iOS 16 or later you can use the new Duration.TimeFormatStyle.Pattern.

Xcode 14.1 • Swift 5.7.1 • iOS 16 or later

extension TimeInterval {
    var duration: Duration { .seconds(self) }
    var positionalTime: String {
        duration.formatted(
            .time(pattern: self >= 3600 ? .hourMinuteSecond : .minuteSecond)
        )
    }
}

8.0.positionalTime     //    "0:08"
161.0.positionalTime   //    "2:41"
3600.0.positionalTime  // "1:00:00"

For older Xcode/Swift versions

Yes. This can be easily accomplished adding a ternary conditional based on the time interval when setting the date components formatter allowed units:

Xcode 11 • Swift 5.1

extension Formatter {
    static let positional: DateComponentsFormatter = {
        let positional = DateComponentsFormatter()
        positional.unitsStyle = .positional
        positional.zeroFormattingBehavior = .pad
        return positional
    }()
}

extension TimeInterval {
    var positionalTime: String {
        Formatter.positional.allowedUnits = self >= 3600 ?
                                            [.hour, .minute, .second] :
                                            [.minute, .second]
        let string = Formatter.positional.string(from: self)!
        return string.hasPrefix("0") && string.count > 4 ?
            .init(string.dropFirst()) : string
    }
}

Usage

8.0.positionalTime     //    "0:08"
161.0.positionalTime   //    "2:41"
3600.0.positionalTime  // "1:00:00"