How to figure out the font size of a UILabel when -adjustsFontSizeToFitWidth is set to YES?

Question

When myLabel.adjustsFontSizeToFitWidth = YES, UILabel will adjust the font size automatically in case the text is too long for the label. For example, if my lab

Answer 1

UILabel *txtLabel = [[UILabel alloc] initWithFrame:rectMax];
txtLabel.numberOfLines = 1;
txtLabel.font = self.fontMax;
txtLabel.adjustsFontSizeToFitWidth = YES;
txtLabel.minimumScaleFactor = 0.1;
[txtLabel setText:strMax];

UILabel *fullSizeLabel = [UILabel new];
fullSizeLabel.font = txtLabel.font;
fullSizeLabel.text = txtLabel.text;
fullSizeLabel.numberOfLines = 1;
[fullSizeLabel sizeToFit];

CGFloat actualFontSize = txtLabel.font.pointSize * (txtLabel.bounds.size.width / fullSizeLabel.bounds.size.width);
actualFontSize = actualFontSize < txtLabel.font.pointSize ? actualFontSize : txtLabel.font.pointSize;
// the actual font
self.fontMax = [UIFont fontWithName:self.fontMax.fontName size:actualFontSize];

my code works great, part from @Igor