Optional Delegate Methods

So you created a delegate class and you defined some delegate methods in it. Now when you run your code.You may get following warning as a result of not implementing all the delegate methods in your implementation file. This article can help.  

 WARNING: iPhone class * does not fully implement the * protocol.

 The solution is to use @optional as shown below.

Ok one more thing when you call optional delegate method in your code ,make sure it has been implemented by user.

  if([delegate respondsToSelector:@selector(colorsForPie)])
  {

        colorsArray_=[delegate colorsForPie];

  }