Question

I am using forward declaration in the calling Class.

.h file in ClassTwo

@class ClassOne

@property(nonatomic,retain) ClassOne *class_One;

.m file

@synthesize class_One;

Then i am trying to call this method in ClassOne

[self.class_One callingThisMethodFromClassTwo];

On the other hand if i create a shared instance in ClassOne and use it as a class method it works

[[ClassOne Shared] nowItWorks];

Sorry if this is a silly question i am very new

Answer 1

try to allocate class_One instance and add #import "ClassOne.h" to headers on top of your classtwo.m

self.class_One= [[ClassOne alloc]init]; 
[self.class_One callingThisMethodFromClassTwo];