Circular #import Reference

Question

I have a Xcode project where I have to transfer Data from my SettingsViewController to my ViewController, the Problem is that I have to implement my SettingsViewController.h in my ViewController, because it gets pushed out of that - but to send data from the SettingsViewController to ViewController I have to implement the ViewController in SettingsViewcontroller too thats when the Program gets stuck - it's not possible having a circular #import reference, isn´t it?

score 4 · Accepted Answer · edited May 23 '17 at 12:12

4

Use forward declaration in all the .h files then and import the files in .m files

Check this question Objective-C: Forward Class Declaration

A forward declaration looks like this:

@class SettingsViewController;

edited May 23 '17 at 12:12

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answered Oct 21 '12 at 02:07

Mahmoud Fayez

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Could you give me a code example for forward declaration please? – Maurice Oct 21 '12 at 02:23
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Also make sure that both object don't have strong (retain) pointers to each other, creating what is called a "retain cycle". – Kaan Dedeoglu Nov 08 '12 at 22:22

Circular #import Reference

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