Swift struct is nil when referenced from a function -

i set struct this:

struct person {     var name: string     var age: int      init(name:string, age:int) {         self.name = name         self.age = age     } }

if in viewdidload, happens expected.

override func viewdidload() {     super.viewdidload()     let person = person(name: "sally", age: 20)     self.titlelabel.text = person.name }

however, if put same code in function, , call function elsewhere

func setup() {     let person = person(name: "wally", age: 12)     self.titlelabel.text = person.name }

the app crashes on line label set, message:

"fatal error: unexpectedly found nil while unwrapping optional value"

what missing here?

UV code