How do I convert an NSString to an integer using Swift?

Question

I need to convert an NSString to an integer in Swift: Here's the current code I'm using; it doesn't work:

 var variable = (NSString(data:data, encoding:NSUTF8StringEncoding))
 exampeStruct.otherVariable = (variable).intValue

Variable is a normal varable, and exampleStruct is a struct elsewhere in the code with a subvariable otherVariable.

I expect it to set exampleStruct.otherVariable to an int value of the NSString, but I get the following error:

"Cannot convert the expression's type () to type Float"

How do I convert an NSString to int in Swift?

Answer 1

You have to unwrap 2 optionals there, notice that I have also declared variable as String adding ":String" there. Example:

if let variable:String = NSString(CString:"1", encoding: NSUTF8StringEncoding) {
    if let otherVariable = variable.toInt() {
        println(otherVariable) // "1"
    }
} 

In your case you should do like this:

if let variable:String = NSString(data: data, encoding: NSUTF8StringEncoding) {
    if let exampeStruct.otherVariable = variable.toInt() {
        println(exampeStruct.otherVariable) // "1"
    }
}