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Alexander Certosimo
1,774 Pointsconfused with optional property in lesson compared to my xcode
hey all,
So i just did the optional properties lesson and in the lesson when assigning
toy.batteries = true toy.batteries
it shows Some True..but writing the same thing in my xcode it just shows true and not some true. Any reason for this?
Also in the if let statement..why is there a second "if batteries" statement nested in the if let statement? i wrote it without the second if statement and it worked exactly the same?
Just looking to get some clarity. Thank you
Alexander Certosimo
1,774 PointsSteve!
Thanks so much for the response! I did end up kind of figuring out what was going on, but you taking the time out is much appreciated. I have a similar question maybe you would know better than me. The reason i say it is similar is because i never had this problem before, it just recently popped up. I am getting a warning saying "Initialization of variable 'input' was never used, consider replacing with '_' or removing it". Here is the code.
class ViewController: UIViewController {
@IBOutlet weak var textInput: UITextView!
@IBAction func submitText(sender: AnyObject) {
var input = textInput.text
}
All i want to do is assign the user inputted text from the UITextView to the variable so i can do some further work with it.. but i am confused as to why i am getting this warning. Been stuck the past couple days
Thanks again!
1 Answer
Stepan Ulyanin
11,318 PointsHey, this is going to be there until you are going to use the variable. If you use the variable further in your code then you need a name and that's where the warning will just go away:
class ViewController: UIViewController {
@IBOutlet weak var textInput: UITextView!
@IBAction func submitText(sender: AnyObject) {
var input = textInput.text
print(input) //using the variable will take the warning off the previous line
}
}
If you are not going to use it then replace the name with _ so you and other programmers would see that this piece of code is not used anywhere further in the code but you might have intentions to
Alexander Certosimo
1,774 PointsThanks so much Stepan, this had me confused for days now!
Unsubscribed User
15,508 PointsUnsubscribed User
15,508 PointsHey, Alexander!
This is an awesome question and I hope I'm able to share any clarity on this from my understanding. :) If you're using Xcode 7+, this might indeed be updates made to Playgrounds in themselves as well as with Swift 2.0. For example, using the same code, the compiler tells me to replace
printlnwith justprint.Regarding the
ifstatement there, I think this use of it is super-helpful for when we need to a) have that first line of checking and b) be super-clear on what we want to return. For example:We're basically saying, if
toy.batterieshas a value, store whatever that value is inbatteriesand then......if this new
batteriesproperty does have a value, then print this line.You more than likely already made this distinction between the two so I'm sorry if I'm going over known ground on your part here. :D