How to call a method every x seconds in Objective-C using NSTimer?

Question

I am using Objective-C, Xcode 4.5.1 and working on an app for the iPhone.

I have a method A in which I want to call another method B to do a series of calculations e

Answer 1

If you look at your code and compared to the one below

[NSTimer scheduledTimerWithTimeInterval:0.1 target:self
select:@selector(targetMethod:myVolumeMonitor()) userInfo:nil repeats:YES];

self means that you are invoking a method in same instance of your class, in your example the method is myVolumeMonitor

[NSTimer scheduledTimerWithTimeInterval:0.1 target:self
selector:@selector(MethodB) userInfo:nil repeats:YES];

and you are good to go though

method be should look like this

- (void)MethodB:(NSTimer*)timer { 
// do something
}