swift – 最接近五的圆形货币

5.31 -> 5.30
5.35 -> 5.35
5.33 -> 5.35
5.38 -> 5.40

目前我是通过使用以下方式获取小数值来实现的：

let numbers = 5.33
let decimal = (numbers - rint(numbers)) * 100
let rounded = rint(numbers) + (5 * round(decimal / 5)) / 100

// This results in 5.35

我想知道是否有一个更好的方法,步骤更少,因为有时数字 – rint(数字)给我一个奇怪的结果,如：

let numbers = 12.12
let decimal = (numbers - rint(numbers)) * 100

// This results in 11.9999999999999

let x: Float = 1.03 //or whatever value, you can also use the Double type
let y = round(x * 20) / 20