Objective-C: call a method you just created

Question

Hi guys,

Simple question, as I am coming from another programming language. In Objective-C, lets say in a controller class I want to separate certain code into its own method, how do I call that method let's say, from viewLoad. As an example, let's say I create a method:

• (void)checkIfInputCorrect { NSLog(@"text"); }

Now, i wanted to have in a delegate method, call this method. I tried [self checkIfInputCorrect] and get a warning saying Controller may not respond to -CheckIf...

I thought something like checkIfInputCorrect() would work that gives an error as well.

Basically how do you call a method?

Answer 1

You need to list the method in the interface (ideal) or list the method implementation before the calling method (less ideal) so that the compiler can know that the class responds to the selector before it compiles the calling line.

Answer 2

Add this to your .h file

- (void)checkIfInputCorrect;

Call it with:

[self checkIfInputCorrect];

Answer 3

To paraphrase Martin,

In your .m file, make sure your method -checkIfInputCorrect is placed so that it's physically above the method that has the line: [self checkIfInputCorrect];