title: Adding glow effect to UIButton - iOS
body: <p>I have an UIButton which is a logo. This logo button will glow on forever but will stop glowing on touch.It is like a glowing animation. </p>
  
  <p>Is there any suggestions?</p>
  
  <pre><code>  Undefined symbols for architecture i386:
   "_OBJC_CLASS_$_CABasicAnimation", referenced from:
   objc-class-ref in UIView+Glow.o
   "_OBJC_CLASS_$_CAMediaTimingFunction", referenced from:
    objc-class-ref in UIView+Glow.o
    "_kCAMediaTimingFunctionEaseInEaseOut", referenced from:
    -[UIView(Glow) startGlowing] in UIView+Glow.o
     ld: symbol(s) not found for architecture i386
     clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>