To resize the UILabel height to take into account font size, use:

sizeWithFont constrainedToSize:lineBreakMode: 

e.g. 

CGSize expectedLabelSize = [yourString sizeWithFont:yourLabel.font constrainedToSize:maximumLabelSize lineBreakMode:yourLabel.lineBreakMode];   

http://stackoverflow.com/questions/446405/adjust-uilabel-height-depending-on-the-text