ios - Calling method declared in ViewController1.m from another ViewController2.m file -

i have declared method 'callwebservice()' in viewcontroller1.m , want call in viewcontroller2.m . have created object of viewcontroller1.m in viewcontroller2.m as:

 viewcontroller1* mainvc = [[viewcontroller1 alloc] init];  

now trying call method unable do. please on new ios , have searched saying use delegates.

first of all, don't use view controllers purpose, create new class handle methods of same kind, use 1 across view controllers. if want same class shared across program, create singleton.

how call method 1 class in (ios)

however, if still want view controller view controller thing, reason not working because instantiating new view controller, not 1 using.

you have pass reference of first vc second vc. depends on how presenting second vc. if using interface builder, need use:

how pass prepareforsegue: object

if manually creating , presenting vc, before presenting let know first vc.

you can use delegates this:

how set simple delegate communicate between 2 view controllers?

still consider redesigning usage of view controllers.

edit:

2 options,

1) singleton:

follow guide http://www.galloway.me.uk/tutorials/singleton-classes/

2) appdelegate:

instantiate object of class in .m of app delegate , assign property in .h of app delegate. then, retrieve object.

this example of doing motion manager ios:

appdelegate.h:

@property (strong,nonatomic) cmmotionmanager *motionmanager; 

appdelegate.m

_motionmanager = [[cmmotionmanager alloc] init]; 

viewcontroller1-2-etc

cmmotionmanager *motionmanager; motionmanager = ((appdelegate*)[uiapplication sharedapplication].delegate).motionmanager;