用归档保存的对象，其子对象必须也支持归档包括自定义的对象。及实现initWithCoder和encodeWithCoder方法

对于保存对象数据到NSMutableArray 里 先要进行序列化 代码如下：
#import <Foundation/Foundation.h>


@interface ReviewUserInfo : NSObject<NSCoding> {
 

      NSString    *userName;
        NSString    *userReview;
        NSString    *userTime;
        float        userStarNum;
}
@property(nonatomic,copy)NSString    *userName;
@property(nonatomic,copy)NSString    *userReview;
@property(nonatomic,copy)NSString    *userTime;
@property(nonatomic,assign)float    userStarNum;
- (void)encodeWithCoder:(NSCoder *)aCoder;
- (id)initWithCoder:(NSCoder *)aDecoder;
@end

#import "ReviewUserInfo.h"


@implementation ReviewUserInfo
@synthesize userName;
@synthesize userTime;
@synthesize userReview;
@synthesize userStarNum;

- (void) encodeWithCoder: (NSCoder *)coder
{
        [coder encodeObject:self.userName forKey:@"userName"];
        [coder encodeObject:self.userReview forKey:@"userReview"];
        [coder encodeObject:self.userTime forKey:@"userTime"];
        [coder encodeFloat:self.userStarNum forKey:@"userStarNum"];
}

- (id) initWithCoder: (NSCoder *) coder
{       
        userName = [[coder decodeObjectForKey:@"userName"]copy];
        userReview = [[coder decodeObjectForKey:@"userReview"]copy];
        userTime = [[coder decodeObjectForKey:@"userTime"]copy];
        userStarNum = [coder decodeFloatForKey:@"userStarNum"];
        return self;
}
@end
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NSMutableArray＊userNameArray = [[NSMutableArray alloc] init];
保存
                ReviewUserInfo        *userInfo =[[ReviewUserInfo alloc] init];
                                userInfo.userName =@"评论成功" ;
                        userInfo.userReview = @"评论成功" ;
                        userInfo.userTime = @"评论成功" ;
                        userInfo.userStarNum = 123;
                        [userNameArray addObject:userInfo];
                        [[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver                        archivedDataWithRootObje ct:userNameArray] forKey:@"UserReviewName"];
读取
                NSData *dataRepresentingSavedArr ay = [[NSUserDefaults standardUserDefaults] objectForKey:@"UserReviewName"];
                if (dataRepresentingSavedArr ay != nil)
                {
                        NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:dataRepresentingSavedArr ay];
                        [userNameArray setArray:oldSavedArray];
                }

用归档保存的对象，其子对象必须也支持归档包括自定义的对象。及实现initWithCoder和encodeWithCoder方