iOS 7 sizeWithAttributes: replacement for sizeWithFont:constrainedToSize

Question

How do you return a multiline text CGSize from the new iOS 7 method sizeWithAttributes?

I would like this to produce the same results as sizeWithFont:constrainedToSi

Answer 1

[As a new user, I cannot post a comment to @testing's answer, but to make his answer (for xamarin.ios) more useful]

We can return a CGRect and only use the height parameter for the gui item we are targeting UIButton etc.Passing in any parameters we need as below

    public CGRect GetRectForString(String strMeasure, int fontSize, nfloat guiItemWidth)
    {
        UIFont descriptionLabelFont =  UIFont.SystemFontOfSize (fontSize);
        NSString textToMeasure = (NSString)strMeasure;

        CGRect labelRect = textToMeasure.GetBoundingRect (
            new CGSize(guiItemWidth, nfloat.MaxValue), 
            NSStringDrawingOptions.UsesLineFragmentOrigin, 
            new UIStringAttributes () { Font = descriptionLabelFont }, 
            new NSStringDrawingContext ()
        );

        return labelRect;
    }

---

        header_Revision.Frame = new CGRect (5
                                            , verticalAdjust
                                            , View.Frame.Width-10
                                            , GetRectForString( header_Revision.Title(UIControlState.Normal)
                                                              , 18
                                                              , View.Frame.Width-10 ).Height
                                            );