Swift, Convert String To Double Error

Question

i wrote a code to convert string to double but gives error :

Cannot convert the expression's type 'Double' to type 'NSString'

and my code is :

var first = previewLable.text
var second = label1.text

var number1: Double = (first as NSString).doubleValue
var number2: Double = (second as NSString).doubleValue

what i have to do to fix this error ???

Thanks

Answer 1

Also if you're in Swift 2 you can use

Double("3.141592")

which gives an Optional Double, depending on whether it could be parsed

Double("hi")

would give nil