Convert String to CGFloat in Swift

Question

I\'m new to Swift, how can I convert a String to CGFloat?

I tried:

var fl: CGFloat = str as CGFloat
var fl: CGFloat = (CGFloat)str
var fl: CGFloat = CGFl         


        

Answer 1

If you want a safe way to do this, here is a possibility:

let str = "32.4"
if let n = NSNumberFormatter().numberFromString(str) {
    let f = CGFloat(n)
}

If you change str to "bob", it won't get converted to a float, while most of the other answers will get turned into 0.0.

For Swift 3.0, I'd do something like this:

let str = "32.4"
guard let n = NSNumberFormatter().number(from: str) else { return }
// Use `n` here

In Swift 4, NSNumberFormatter has been renamed to NumberFormatter:

let str = "32.4"
guard let n = NumberFormatter().number(from: str) else { return }