iOS Question Extend DecimalNumber

Emme Developer · Jul 5, 2017

Hi everybody, i tried different times to extend the DecimalNumber class by @Erel, but without success. Anyone can help me to port this code? I'm not able to use very well Object c

B4X:

import Foundation

extension NSDecimalNumber {
    public func round(_ decimals:Int) -> NSDecimalNumber {
        return self.rounding(accordingToBehavior:
            NSDecimalNumberHandler(roundingMode: .plain,
                                   scale: Int16(decimals),
                                   raiseOnExactness: false,
                                   raiseOnOverflow: false,
                                   raiseOnUnderflow: false,
                                   raiseOnDivideByZero: false))
    }
}

let amount = NSDecimalNumber(string: "123.456")

Based on this answer

Erel · Jul 6, 2017

Which functionality are you trying to add?

DecimalNumber class: https://www.b4x.com/android/forum/threads/class-decimalnumber-similar-to-b4a-bignumber.79332/

Emme Developer · Jul 6, 2017

Erel said:
Which functionality are you trying to add?

DecimalNumber class: https://www.b4x.com/android/forum/threads/class-decimalnumber-similar-to-b4a-bignumber.79332/

Hi @Erel, i'm trying to add Round function, but without success

Erel · Jul 6, 2017

Add this sub to DecimalNumber class:

B4X:

Public Sub DecimalRound(NumberOfDigits As Int) As DecimalNumber
   Dim handler As NativeObject
   handler.Initialize("NSDecimalNumberHandler")
   handler = handler.RunMethod("decimalNumberHandlerWithRoundingMode:scale:raiseOnExactness:raiseOnOverflow:raiseOnUnderflow:raiseOnDivideByZero:", _
     Array(3, NumberOfDigits, False, False, False, False)) '3 = bankers rounding
   Dim dm As DecimalNumber
   dm.Initialize("")
   Return dm.InitWithDecimal(num.RunMethod("decimalNumberByRoundingAccordingToBehavior:", Array(handler)))
End Sub

Emme Developer · Jul 6, 2017

Erel said:

Add this sub to DecimalNumber class:

B4X:

Public Sub DecimalRound(NumberOfDigits As Int) As DecimalNumber
   Dim handler As NativeObject
   handler.Initialize("NSDecimalNumberHandler")
   handler = handler.RunMethod("decimalNumberHandlerWithRoundingMode:scale:raiseOnExactness:raiseOnOverflow:raiseOnUnderflow:raiseOnDivideByZero:", _
     Array(3, NumberOfDigits, False, False, False, False)) '3 = bankers rounding
   Dim dm As DecimalNumber
   dm.Initialize("")
   Return dm.InitWithDecimal(num.RunMethod("decimalNumberByRoundingAccordingToBehavior:", Array(handler)))
End Sub

Damn @Erel, that's nice. I tried it 30times

iOS Question Extend DecimalNumber

Emme Developer

Well-Known Member

Erel

B4X founder

Emme Developer

Well-Known Member

Erel

B4X founder

Emme Developer

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