IOS---UITableViewCell自适应行高（非AutoLayout）

如题所示，本程序是使用非AutoLayout写的UITableView自适应行高,之后笔者将会写一个基于AutoLayout的自适应行高的小demo。
PS：此小程序只适用于刚接触IOS的小朋友，只用做参考，毫无技术性，大神勿喷。

上代码：

//UITableViewCell#import <UIKit/UIKit.h>@interface commentaryCell : UITableViewCell@property (retain, nonatomic)  UILabel *userID;@property (retain, nonatomic) UILabel *date;@property (retain, nonatomic) UILabel *commentary;-(void)setContent:(NSString *)userid_dic :(NSString *)date_dic :(NSString *)comment_dic;@end#import "commentaryCell.h"float width;float height;NSString *commentaryStr;@implementation commentaryCell@synthesize userID;@synthesize date;@synthesize commentary;- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];    if (self) {        self.contentView.backgroundColor = [UIColor whiteColor];        [self createView];    }    return self;}-(void)createView{    width = self.contentView.frame.size.width;    height = self.contentView.frame.size.height;    //用户ID    userID = [[UILabel alloc] initWithFrame:CGRectMake(width*0.05, height*0.3, width*0.3, height*0.3)];    userID.font = [UIFont systemFontOfSize:14];    [userID setTextColor:[UIColor colorWithRed:85.0/255.0 green:85.0/255.0 blue:85.0/255.0 alpha:0.6]];    [self.contentView addSubview:userID];    //时间图标    //时间    date = [[UILabel alloc] initWithFrame:CGRectMake(width*0.4, height*0.3, width*0.5, height*0.3)];    date.font = [UIFont systemFontOfSize:14];    [date setTextColor:[UIColor colorWithRed:85.0/255.0 green:85.0/255.0 blue:85.0/255.0 alpha:0.6]];    [self.contentView addSubview:date];    //评论    commentary = [[UILabel alloc] init];    [commentary setNumberOfLines:0];    commentary.font = [UIFont systemFontOfSize:16];    [commentary setTextColor:[UIColor colorWithRed:85.0/255.0 green:85.0/255.0 blue:85.0/255.0 alpha:1]];    [self.contentView addSubview:commentary];}-(void)setContent:(NSString *)userid_dic :(NSString *)date_dic :(NSString *)comment_dic{    userID.text = userid_dic;    date.text = date_dic;    [commentary setNumberOfLines:0];    commentary.text = comment_dic;    commentary.font = [UIFont systemFontOfSize:16];    CGSize commentSize = [self returnSize:commentary.text font:commentary.font];    [commentary setFrame:CGRectMake(width*0.05, 41, commentSize.width, commentSize.height)];}//返回Label的Size-(CGSize)returnSize:(NSString *)text font:(UIFont *)font{    float width = [UIScreen mainScreen].bounds.size.width;    float height = [UIScreen mainScreen].bounds.size.height;    CGSize _Size = CGSizeMake(width*0.9, height);    CGSize Size = [text sizeWithFont:font constrainedToSize:_Size lineBreakMode:NSLineBreakByWordWrapping];    return Size;}