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Pass button title to function - nil while unwrapping optionals

Forums > iOS

Hello everybody,

I am using a button trigger in Playgrounds to pass the button title to a function in another class.

@objc func letterButtonPressed(_ sender: UIButton) {  

        sender.isHidden = true  
        hiddenButtons.append(sender)  

        letter = sender.currentTitle?.uppercased()  

        if letter != nil {  
            game.checkLetterInWord(letter: letter!)  
        }  
}  

In this function above I check if the letter is nil first, so I don't undertstand why the function finds nil...

public func checkLetterInWord(letter: String!) -> Bool {  
        print(letter!)  
        let wordCharacters = Array(word)  
        print(wordCharacters)  

        return true  
}  

What am I doing wrong? Thank you for you help!

3      

Instead of

if letter != nil {  
            game.checkLetterInWord(letter: letter!)  
        }  

try:

guard let letter = sender.currentTitle?.uppercased() else { return }
game.checkLetterInWord(letter: letter)

The guard unwraps the optional and gets rid of the bangs.

3      

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