如何在点后用两位数打印Double并隐藏它们（如果为零）？

Question

如何在点后用两位数字打印Double并隐藏是否为零？

• 5.12345-> 5.12

• 5.00000-> 5

• 5.10000-> 5.10

Answer 1

您可以尝试

func format(_ x: Double) -> String {
    if Double(Int(x)) == x {
        return String(Int(x))
    } else {
        let numberFormatter = NumberFormatter()
        numberFormatter.maximumFractionDigits = 2
        numberFormatter.minimumFractionDigits = 2
        guard let s = numberFormatter.string(for: x) else {
            fatalError("Couldn't format number")
        }
        return s
    }
}

format(5.12)  //"5.12"
format(5.0)   //"5"
format(5.10)  //"5.10"