How to get a Double value up to 2 Decimal places [duplicate]

问题

This question already has answers here:

Rounding a double value to x number of decimal places in swift (27 answers)

Closed 3 years ago.

In my app I am dealing with currency which is need to upto two decimal digit , I have used number formatter for this to display up to two decimal place but When I want this double value up like 0.7 to 0.70 , I am unable to to do that , type double is always giving me 0.7 but i want 0.7 to 0.70

回答1:

You can simply do this:

let pi = 3.14159

let text = String(format: "%.2f", arguments: [pi])

print(text) // output = 3.14

回答2:

You should use NSNumberFormatter:

let numberFormatter = NSNumberFormatter()
numberFormatter.minimumFractionDigits = 2
numberFormatter.maximumFractionDigits = 2

let pi = 3.14159
let str = numberFormatter.stringFromNumber(pi)!

print(str)

来源：https://stackoverflow.com/questions/37630269/how-to-get-a-double-value-up-to-2-decimal-places