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iosobjective-cpointersnon-nullable

How to assign non-null property to button?

I am declaring an action for UIButton in myviewcontroller.h file like this

- (IBAction)loginClicked:(id)sender;

but I can see warning like Pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified). How can I resolve this issue?

thanks

Solution

  • Replace

    - (IBAction)loginClicked:(id)sender

    With 

    -(IBAction) loginClicked:(nonnull id)sender

    Read more at: https://developer.apple.com/swift/blog/?id=25