&& in if statement (swift)

Question

Created Jul ’17

Replies 2

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Participants 3

    @IBAction func cycanButtonAction(_ sender: Any) {
        if ((anzeigeZahl.backgroundColor == UIColor.cyan) && FarbeOderZahl = false) {
        score += 1
            routine()
           
        }

        else {
           youLostButton.isHidden = false
           routine()
        }
    }

in line 2 it says: "cannot assign to value && returns immutable value"

how can I fix it?

thanks!

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Answer 1

OOPer OP

Jul ’17

Single equal sign `=` is an assignment operator and I guess you misplaced it with `==` in line 2.

And generally, when expression is a `Bool` (not `Bool?`), better use `!expression` than `expression == false`.

0

Answer 2

DTS Engineer OP

Apple

Jul ’17

And generally, when expression is a
Bool
(not
Bool?
), better use
!expression
than
expression == false
.

Indeed. In Swift it reads badly but will typically work. In C-based languages it’s not guaranteed to work, that is, there are Boolean expressions where

!expression

and

expression == false

yield different results!

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