Use unresolved identifier

问题

My app was working fine and now suddenly Xcode is giving me this error:

use unresolved identifier cardWasRemoved

func addNewCards() {
    countOfCards = countOfCards-1
    if(countOfCards >= 0){
        self.arrayAuthorization.remove(at: dm.objectIndexToRemove)
        cardWasRemoved(removeIndex: dm.objectIndexToRemove)

    }
}

And my method implementation is this:

open func cardWasRemoved(removeIndex:Int) {
    if layout.newCardShouldAppearOnTheBottom {
        layout.cardDidRemoved(removeIndex)
    } else {
        layout.cardDidRemoved(removeIndex)
    }
}

回答1:

It might be that there are some artifacts for the Debug build configuration (when you try running on a Simulator), and you don't have these artifacts for the Release configuration. Try removing your DerivedData directory: How to delete derived data in Xcode 8?

来源：https://stackoverflow.com/questions/45771696/use-unresolved-identifier