I have 4 viewcontroller like, home , sign in, sign up, Forgot password Viewcontroller's. And I set the storyboard identity for all view controller.In my each screen I have 1 or 2 button and I need to connect the other view controller programmatically with replace seague Here is my full details about screen , buttonname( action ), destination VC Screens
 Home screen =  sign in button  = signinvc ( storyboard identity Vc's)
                    sign Up button  = SignUpvc( storyboard identity Vc's)
    SignIn VC =  NotRegisterBtn          = SignUpvc( storyboard identity Vc's)
                    forgot password Button  =  forgotvc( storyboard identity Vc's)
    SignUp VC = AlreadyReg_Button = Sign In VC( storyboard identity Vc's)
    Forgot VC = CancelBtn  = SignIn vc( storyboard identity Vc's)
How to do that in full programmatically?
Updated:
-(void) methodone {
}
-(void) methodtwo {
}
Now how can i show the presentedviewmodal vc for this two button method action..First method should go to signVc, second method should go to signInVC