自动调整文字高度With what should I replace the deprecated sizeWithFont:contrainedToSize:lineBreakMode method?

自动调整文字的高度：

ios 2.0 ~ 7.0以下：

UILabel *orgnizationLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, self.cellImageView.frame.size.height + 5, self.cellImageView.frame.size.width, 0)];
        self.nameLabel = orgnizationLabel;
        self.nameLabel.text = @"富力桃园幼儿园管理员";
        self.nameLabel.textAlignment = NSTextAlignmentLeft;
        self.nameLabel.font = [UIFont systemFontOfSize:16.0];
        self.nameLabel.numberOfLines = 0;
        self.nameLabel.lineBreakMode = NSLineBreakByWordWrapping;
        self.nameLabel.textColor = [UIColor colorWithRed:68/255.0f green:153/255.0f blue:181/255.0f alpha:1.0];
        
        CGRect labelFrameN = self.nameLabel.frame;
       labelFrameN.size = [self.nameLabel.text sizeWithFont:self.nameLabel.font
                                           constrainedToSize:CGSizeMake(self.nameLabel.frame.size.width, CGFLOAT_MAX)
                                               lineBreakMode:self.nameLabel.lineBreakMode];
        self.nameLabel.frame = labelFrameN;

7.0以及以后：

CGRect labelFrameN = self.nameLabel.frame;

NSDictionary *stringAttributes = [NSDictionary dictionaryWithObject:self.nameLabel.font forKey: NSFontAttributeName];
        
        labelFrameN.size = [self.nameLabel.text boundingRectWithSize:CGSizeMake(self.nameLabel.frame.size.width, CGFLOAT_MAX)
                                                         options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesLineFragmentOrigin
                                                      attributes:stringAttributes context:nil].size;
        
        self.nameLabel.frame = labelFrameN;