NSAttributedString ignores Autoshrink and numberOfLines for UILabel (iOS 6)

Question

I have UILabel with number of lines = 2 system font size = 15 minimum font size = 8 Line break mode - Truncate tail

When I set long text which have type NSString for UI

Answer 1

NSMutableAttributedString *muAtrStr = [[NSMutableAttributedString alloc]initWithString:@"2"];
NSAttributedString *atrStr = [[NSAttributedString alloc]initWithString:@"\ndays" attributes:@{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Bold" size:8]}];
[muAtrStr appendAttributedString:atrStr];
self.lbl.numberOfLines = 0;
[self.lbl setAttributedText:muAtrStr];