1. Add the CometChat SDK to your app:

Drag the MessageSDKFramework.framework into your Xcode project folder target. Make sure the “Copy items to destination’s group folder” checkbox is checked.

2. Add Dependencies:

Click on Targets → Your app name → and then the ‘Build Phases’ tab.
Expand ‘Link Binary With Libraries’ as given below. And add the following frameworks.

SystemConfigurarion.framework

MobileCoreServices.framework

CoreGraphics.framework

CFNetwork.framework

libxml2.dylib

libz.dylib

libsqlite3.dylib

3. Add Linker Flag:

Click on Targets → Your app name → and then the ‘Build Settings’ tab.
Scroll down to the ‘Linking’ section, and double-click to the right of where it says ‘Other Linker Flags’. Click on the “+” button to add the following:

-ObjC

-all_load

CometChat allows users to converse through One-on-One Chat as well as Chatrooms