Skipping Code in Swift 2.2

        if one != "a" {
        lOne.text = "G"
    }
    if one != "b" {
        lOne.text = "H"
    }
    if one != "c" {
        lOne.text = "I"
    }
    if one != "d" {
        lOne.text = "J"
    }
    if one != "e" {
        lOne.text = "K"
    }
    if one != "f" {
        lOne.text = "L"
    }
    if one != "g" {
        lOne.text = "M"
    }
    if one != "h" {
        lOne.text = "N"
    }
    if one != "i" {
        lOne.text = "O"
    }
    if one != "j" {
        lOne.text = "P"
    }
    if one != "k" {
        lOne.text = "Q"
    }
    if one != "l" {
        lOne.text = "R"
    }
    if one != "m" {
        lOne.text = "S"
    }
    if one != "n" {
        lOne.text = "T"
    }
    if one != "o" {
        lOne.text = "U"
    }
    if one != "p" {
        lOne.text = "V"
    }
    if one != "q" {
        lOne.text = "W"
    }
    if one != "r" {
        lOne.text = "X"
    }
    if one != "s" {
        lOne.text = "Y"
    }
    if one != "t" {
        lOne.text = "Z"
    }
    if one != "u" {
        lOne.text = "A"
    }
    if one != "v" {
        lOne.text = "B"
    }
    if one != "w" {
        lOne.text = "C"
    }
    if one != "x" {
        lOne.text = "D"
    }
    if one != "y" {
        lOne.text = "E"
    }
    if one != "z" {
        lOne.text = "F"
    } else {
        lOne.text = ""
    }

I have two questions about my code. First I would like a more efficient way to write this but, the biggest question I have is when I run it on an iPhone it skips all the way to the last line and outputs that. When it should look at every line any output the correct answer. By the way if you are wondering this is to make a app that takes words and makes them into code so that without the key you cannot read them.