title: How to add another parameter to an existing method
body: <p>I have a category <code>NSObject+Utilities</code> which contains all kinds of tool methods I use in my projects. Unfortunately I have to add one more parameter to a method that returns <code>NSColor</code>. </p>
  
  <p>Here an Example:</p>
  
  <pre><code>- (NSColor*) ccBlueLight   { 
     return  [self libMakeAColor    :0.000f :0.535f :1.0f :1.000f];
  }
  </code></pre>
  
  <p>The last parameter (<code>1.000f</code>) is responsible is for transparency. When I created this method I didn´t think of transparency and I fixed it to <code>1.000f</code>. Since I´m using these <code>cc</code> Colors in different projects I cannot simply add another parameter without getting errors in the other projects when using them.</p>
  
  <p>Is there a way to add the transparency parameter without problems?</p>