if let statement with multiple returns from function in swift

say i have a function

func function1() -> (result:Bool, data:String){

    return(false, "false")

}

and i want to use the return value of the Bool in an if let statement so,

if let value = function1 {
    //code
} else {
    //code
}

How would I get this to work? I can't seem to see it in the swift docs, as it just aludes to it being a returned tuple, which you can access with dot notation, but only if you set the return to be a tuple first - so for example this would work

var value = function1()

if value.result {
    ////code
} else {
    //code
}

works, but i'd like to fit it all into the actual if else if possible. Any ideas?