title: What is the alternative method for "- (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size" in ios 7
body: <p>Can anybody tell me What is the alternative method for <code>- (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size</code> in ios 7?</p>
  
  <p>This method is deprecated in ios 7. What method should I use that can return the size of string?</p>