Question

I know how to make global variables in the iphone programing. I want to know can we make a global function in iphone application (like a global veriables).

Answer 1

There are many ways to do so, global functions are not a good idea when programming in Objective C , you should read later the basic ideas of MVC

Nevertheless, there is a good and easy way to achieve what you are trying to do, without doing a major programming sin.

in your ApplicationDelegate file declare your function
for example:

// In the Delegate M
-(void)GlobalFunction
{
    NSLog(@"A global function was called);
}

from another viewController / Class or such do this:

yourApplicationNameDelegate *appDelegate = (DPRAppDelegate *)[[UIApplication sharedApplication] delegate];

[appDelegate GlobalFunction];