String to NSNumber in Swift

Question

I found a method to convert String to NSNumber, but the code is in Objective-C. I have tried converting it to Swift but it is not working.

The code I am using:

NSNumberFormatter *f = [[NSNumberFormatter alloc] init]; f.numberStyle = NSNumberFormatterDecimalStyle; NSNumber *myNumber = [f numberFromString:@"42222222222"]; 

and in Swift I am using it in this way:

var i = NSNumberFormatter.numberFromString("42") 

But this code is not working. What am I doing wrong?

Answer 1

Swift 3.0

NSNumber(integer:myInteger) has changed to NSNumber(value:myInteger)

let someString = "42222222222" if let myInteger = Int(someString) {     let myNumber = NSNumber(value:myInteger) } 

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Swift 2.0

Use the Int() initialiser like this.

let someString = "42222222222" if let myInteger = Int(someString) {     let myNumber = NSNumber(integer:myInteger)     print(myNumber) } else {     print("'\(someString)' did not convert to an Int") } 

This can be done in one line if you already know the string will convert perfectly or you just don't care.

let myNumber = Int("42222222222")! 

---

Swift 1.0

Use the toInt() method.

let someString = "42222222222" if let myInteger = someString.toInt() {     let myNumber = NSNumber(integer:myInteger)     println(myNumber) } else {     println("'\(someString)' did not convert to an Int") } 

Answer 2

Or do it just in one line:

NSNumberFormatter().numberFromString("55")!.decimalValue