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stringswiftnsstringdouble
Ali Sheikhi
Ali Sheikhi

Reputation: 49

Swift, Convert String To Double Error

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

Upvotes: 2

Views: 6133

Answers (2)

Kametrixom
Kametrixom

Reputation: 14993

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

Upvotes: 13

Dharmesh Kheni
Dharmesh Kheni

Reputation: 71862

You just need to unwrap it like this:

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

Or you can use this way which is safe:

if let first = previewLable.text, second = lable1.text{
    var number1: Double = (first as NSString).doubleValue
    var number2: Double = (second as NSString).doubleValue
}

And for info about ? and ! read this.

Upvotes: 2

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