I'm new to Objective-C.
If I wrote this method declaration in .h
-(void)myMethod;
and this implementation in .m
-(void)myMethod{
    NSLog(@"This is myMethod");
}
How can I call it in my class' viewDidLoad method?
Thank you.
Simply just use object "self"
[self myMethod];
Assuming that -viewDidLoad is in the same class, use 
[self myMethod];
self here is an automatic reference to the current object instance.  If you want to call a method on another object stored in a pointer otherObj, it would be
[otherObj myMethod];
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