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You might want to assign a default value or wrap it in if-let to ensure the presence of value.

Since the initializer is failable initialzier, all of the above would produce nil as a result. Int ( " 100" ) // Includes whitespace Int ( "21-50" ) // Invalid format Int ( "ff6600" ) // Characters out of bounds Int ( "10000000000000000000000000" ) // Out of range Int ( "untitled123" ) // Characters out of bounds Int ( "123untitled" ) // Characters out of bounds Int ( "1,234" ) // Characters out of bounds It is everything that is not valid, but I will give you some cases that you might encounter. It only supports strings that begin with a plus or minus sign character ( + or -), followed by one or more numeric digits ( 0-9).

let x = Int ( "123" ) // 123īefore you go with these methods, you should know which kind of strings that Int can convert to integer. To convert a string to integer, we initialize an Int with desired string. Int has an initializer that creates a new integer value from the given string. There are many ways to convert a string of integers in Swift. It happens most of the time when you try to consume data from an external source like a website or API where you have no control over them. There will be a time when you need to convert a string of integers ( "123") back to an integer ( 123).