[Solved] How To get and convert last character of string into Int in Swift 3?

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Simply convert that last character to String and then String to Int.

if let last = str.characters.last, let value = Int(String(last)) {
     print(value)
}

Edit: If you are having a number like cart10,cart11,…cart100… then to get the number after cart try this way.

let str = "cart15"
let cartNumber = str.characters.flatMap({Int(String($0))}).reduce(0, {10 * $0 + $1})
print(cartNumber) //15

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solved How To get and convert last character of string into Int in Swift 3?