Entity *userEntity = [[Entity alloc]init];
userEntity.entityId=self.currentUser.entityId;
Invite *invite = [[Invite alloc]init];
invite.sourceEntityId=userEntity.entityId;
invite.destinationEntityId=thePersonYouWantToInvite.entityId;
invite.message=@"Please add me as a contact!";

[self createUnityObject:invite withCompletionBlock:^(id object, bool succcess, NSString *errorMessage)
{
	if(success)
	{
		// show success message                  
	}
	else
	{
		NSLog("%@",errorMessage);
	}
}];

Entity *userEntity = [[Entity alloc]init];
userEntity.entityId=self.currentUser.entityId;
Invite *invite = [[Invite alloc]init];
invite.sourceEntityId=userEntity.entityId;
invite.destinationEntityId=thePersonYouWantToInvite.entityId;
invite.message=@"Please add me as a contact!";

[self createUnityObject:invite withCompletionBlock:^(id object, bool succcess, NSString *errorMessage)
{
	if(success)
	{
		// show success message                  
	}
	else
	{
		NSLog(%@",errorMessage);
	}
}];

This shows the basic process for sending an invite to a contact found through search or otherwise.

Sending an Invite in Unity

Objective C