不工作swift 4的浮动[副本]

Question

let value:Float = 5.678434
let roundedValue = round(value * 100) / 100

roundedValue浮动5.6784339

如何得到5.67或5.68？

Answer 1

extension Float {
    func rounded(toPlaces places:Int) -> Float {
        let divisor = pow(10.0, Float(places))
        return (self * divisor).rounded() / divisor
    }
}

let floatNumber:Float = 3.67565676

print(floatNumber.rounded(toPlaces: 2)) 

//打印3.68