If you have an integer hiding inside a string, you can convert between the two just by using the integer's constructor, like this:
let myString1 = "556" let myInt1 = Int(myString1)
As with other data types (
Double) you can also convert by using
let myString2 = "556" let myInt2 = (myString2 as NSString).integerValue
Available from iOS 7.0
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