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

well you can try this :

NSDictionary *attributes = @{NSFontAttributeName: [UIFont fontWithName:@"HelveticaNeue" size:14]};
// NSString class method: boundingRectWithSize:options:attributes:context is
// available only on ios7.0 sdk.
CGRect rect = [textToMeasure boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX)
                                          options:NSStringDrawingUsesLineFragmentOrigin
                                       attributes:attributes
                                          context:nil];

Answer 2

Here's my method to deal with both situations, goes in an NSString category.

- (CGSize) sizeWithFontOrAttributes:(UIFont *) font {
    if (IS_IOS7) {
        NSDictionary *fontWithAttributes = @{NSFontAttributeName:font};
        return [self sizeWithAttributes:fontWithAttributes];
    } else {
        return [self sizeWithFont:font];
    }
}

Answer 3

As an alternative, if you're looking at UITextView, you can always use the NSLayoutManager method:

CGSize textSize = [textView.layoutManager usedRectForTextContainer:textView.textContainer].size;

You can also find the line height for a given font by:

UIFont *font;
CGFloat lineHeight = font.lineHeight;