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iOS Build a Simple iPhone App (iOS7) Refactoring into a Model Understanding @property

Christopher Dyer
Christopher Dyer
3,634 Points
Posted by Christopher Dyer
Christopher Dyer
3,634 Points

In xcode6 beta, "_predictions" is an undeclared identifier, while self.predictions is ok. Could you please consider why?

I am still programming objective-c, and everything else works essentially the same. Of course, I may be making a mistake somewhere. Hopefully you can illuminate what is going on. THanks.

1 Answer

David Anton
PLUS
David Anton
Courses Plus Student 30,936 Points
David Anton
David Anton
Courses Plus Student 30,936 Points

Hey Christopher Dyer,

Try to write this code in the .m file. If you declared a property in the .h file, you should synthesize with the .m file.

Example .h file: @interface FVTabSettingsViewController : UIViewController @property (strong, nonatomic) IBOutlet UIButton *DBButton;

Example .m file: @interface FVTabSettingsViewController () @end @implementation FVTabSettingsViewController{} @synthesize DBButton =_ DBButton;

Christopher Dyer
Christopher Dyer
3,634 Points
Christopher Dyer
Christopher Dyer
3,634 Points

Thanks David. You are right, this works, but I'm not sure why @synthesize also resolves the errors. If I might clarify my original questions - I'd like to know when to use _ self. or synthesize or does it just not matter?