title: Drawing Hollow circle in iPhone
body: <p>i need to draw the following image <img src="https://i.stack.imgur.com/yaEXV.png" alt="enter image description here"></p>
  
  <p>The Gray part is what i want to draw over another image what is the Code i need to use using CGContext methods, i tried using the CGContextAddArc but failed because when i fill the stroke the center hollow is also filled with the grey texture.</p>
  
  <p>Any help appreciated.</p>
  
  <p>Info : I have the Complete Blue Image , i need to add the Semi Circle above the blue image</p>
  
  <p>Thanks</p>