用归档保存的对象，其子对象…

来源：互联网发布：b站好看的视频知乎编辑：程序博客网时间：2024/05/22 02:14

收藏一下，总结的不错。

原文地址：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方作者：Bill

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.userNameforKey:@"userName"];
   [coder encodeObject:self.userReviewforKey:@"userReview"];
   [coder encodeObject:self.userTimeforKey:@"userTime"];
   [coder encodeFloat:self.userStarNumforKey:@"userStarNum"];
}

- (id) initWithCoder: (NSCoder *) coder
{
   userName = [[coderdecodeObjectForKey:@"userName"]copy];
   userReview = [[coderdecodeObjectForKey:@"userReview"]copy];
   userTime = [[coderdecodeObjectForKey:@"userTime"]copy];
   userStarNum = [coderdecodeFloatForKey:@"userStarNum"];
   return self;
}
@end
－－－－－－－－－－－－－－－－－－－－－－－－
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            archivedDataWithRootObject:userNameArray]forKey:@"UserReviewName"];
读取
       NSData*dataRepresentingSavedArray = [[NSUserDefaultsstandardUserDefaults] objectForKey:@"UserReviewName"];
      if(dataRepresentingSavedArray != nil)
      {
         NSArray*oldSavedArray = [NSKeyedUnarchiverunarchiveObjectWithData:dataRepresentingSavedArray];
         [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方法

0 0