Implicit declaration of function 'funcName' ; Previous implicit declaration of 'funcName' was here?

I get 2 warnings:

• Implicit declaration of function 'funcName'
• Previous implicit decl开发者_StackOverflowaration of 'funcName' was here

Not sure why.

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Just what the warning says. An "implicit" declaration of a function is usually one that isn't defined yet. Could you also include the line of code that is giving you that warning?

My first thought is that you are not #import ing some code you need so the compiler knows where to find that function.