Remove first character from string [duplicate]

Question

I have this code:

func barcodeData(_ barcode: String!, type: Int32) {
    referenceField.text = barcode!
}

When I scan a barcode the textfield is replaced by it. It's always an "R" in the beginning of the barcode followed by some digits.

I want the textfield to display only the numbers. So if the barcode scanned is "R454512" I want the textfield to show only "454512"

Could someone explain this to me? I'm pretty new in this barcode-world. I don't have any values yet so how am I supposed to use this?

Thanks

What do you mean by I don't have any values yet don't you get R454512 value in barcode argument. — Nirav D
– Nirav D, Commented Jun 9, 2017 at 11:11
I have the function that uses a external device to scan a barcode. But I don't know the barcode until it's scanned? So how am I supposed to type let text = "R454512"? If there are other values too? — moseby
– moseby, Commented Jun 9, 2017 at 11:14
@moseby Write like this referenceField.text = String(barcode.characters.dropFirst()) — Nirav D
– Nirav D, Commented Jun 9, 2017 at 11:18

totiDev · Accepted Answer · 2017-06-09 10:18:06Z

1

Another way to do this is with a characterSet. This way if there are more letters or spaces at the start or end of the string, you will get the correct result:

barcode.trimmingCharacters(in: CharacterSet.decimalDigits.inverted)

answered Jun 9, 2017 at 10:18

totiDev

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