Question

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How does an underscore in front of a variable in a cocoa objective-c class work?
Why rename synthesized properties in iOS with leading underscores?

I am a green hand in iOS programming.

I always see such a statement in other’s code

@synthesize textNoteOrLink = _textNoteOrLink;

What is the meaning of the underline anyway? Can we just ‘textNoteOrLink’ in that case.

Answer 1

Yes you can just write textNoteOrLink.

Many developers put an underscore at the start of instance variable names (@synthesizing a property actually adds an ivar for that property) to avoid accidentally using the ivars instead of the property, bypassing setters and getters.

IMHO it’s a good thing to do, but if you don’t like it, just don’t use it, but be cautions not to confuse properties and ivars.