How to calculate height of html string before loading into webview in ios 7?

Question

I want to find the height of html string that is coming from webservice. Kindly suggest me with the best solution.

Thanks in Advance

Answer 1

A bit of a workaround to this would be to load the HTML into an NSAttributedString and get it's height.

NSAttributedString *text = [[NSAttributedString alloc] initWithData:[html dataUsingEncoding:NSUTF8StringEncoding]
                                                            options:@{NSDocumentTypeDocumentAttribute : NSHTMLTextDocumentType,
                                                                      NSCharacterEncodingDocumentAttribute : @(NSUTF8StringEncoding)}
                                                 documentAttributes:nil
                                                              error:nil]; // make sure to check for error in a real app

// Then get the bounding rect based on a known width
CGRect textFrame = [text boundingRectWithSize:CGSizeMake(someKnownWidth, CGFLOAT_MAX)
                                      options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
                                      context:nil];

CGFloat height = textFrame.size.height;

I haven't tried this with varied HTML so YMMV.