if !checkFirstName(firstName: firstNameField.text!)  {
        firstNameField.text = "foo"
        return false
    }

    firstNameField.text = "bar"


    if !checkLastName(lastName: lastNameField.text!)  {
        lastNameField.text = "foo"
        return false
    }

    lastNameField.text = "bar"

    ...

let functionNames = ["FirstName", "LastName", ...]
let fields = ["FirstName": firstNameField, "LastName": lastNameField, ...]

...

for name in functionNames {
    let sel = Selector("check" + name + ":")

    if !view.perform(sel) {
       fields[name].text = "foo"
       return false
    }

    fields[name].text = "bar"
    return true
}