How to calculate actual font point size in iOS 7 (not the bounding rectangle)?

Question

Edit: The linked \"duplicate\" question only deals with calculating text rectangle. I need to calculate actual font size after label scaled it, NOT the string size.<

Answer 1

Distilled from Julius Bahr's answer on this page, this method works perfectly for getting the actual font size after it has been automatically adjusted:

- (CGFloat)getActualFontSizeForLabel:(UILabel *)label
{
    NSStringDrawingContext *labelContext = [NSStringDrawingContext new];
    labelContext.minimumScaleFactor = label.minimumScaleFactor;

    NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:label.text attributes:@{ NSFontAttributeName: label.font }];
    [attributedString boundingRectWithSize:label.frame.size
                                   options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
                                   context:labelContext];

    CGFloat actualFontSize = label.font.pointSize * labelContext.actualScaleFactor;
    return actualFontSize;
}

I am using this in my application to get the font sizes for three different labels for which I need to keep the sizes in synch while still allowing them to auto-shrink for localized translations that can be quite a bit longer than their original English counterparts.

I call that method once for each label, and then if they are not all the same value, I set the label's font sizes to the minimum of the three.