NSDictionary *attribute = @{NSFontAttributeName: [UIFont systemFontOfSize:15]};
CGSize size = [label.text boundingRectWithSize:CGSizeMake(200, MAXFLOAT) options: NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:attribute context:nil].size;