Objective-C: How to call an instance method

Question

I need to call a method that I defined as:

-(IBAction)next:(id)sender{ 
...

}

I want to call him -[UIViewController viewDidload]

How can I call this method programmatically?

Answer 1

[self next:nil];

• selfis an object receiving a message, assuming it -next:is defined in the same class as -viewDidLoad.
• next: is the name of the message (method).
• Since you are not using sender, pass an argument nilthat means "nothing."

If -next:defined in the application delegate, but -viewDidLoadin a controller of some kind, use

[UIApplication sharedApplication].delegate

to contact the application delegate. Thus, the statement becomes

[[UIApplication sharedApplication].delegate next:nil];