NSUserDefaults存储自定义对象

  由于NSUserDefaults存储类型有限（NSNumber（NSInteger、float、double），NSString，NSDate，NSArray，NSDictionary，BOOL.），不支持直接存储对象，如果想要存储自定义对象，需要先转成NSData再存储。

    首先在自定义的实体对象里继承NSCoding协议，再实现encodeWithCoder、initWithCoder方法即可

例如用户user表：user.h

#import <Foundation/Foundation.h>

@interface User : NSObject <NSCoding>

@property (strong, nonatomic) NSString *userId;
@property (strong, nonatomic) NSString *headimg;
@property (strong, nonatomic) NSString *createtime;
@property (strong, nonatomic) NSString *integral;
@property (strong, nonatomic) NSString *isadmin;
@property (strong, nonatomic) NSString *mail;
@property (strong, nonatomic) NSString *mobile;
@property (strong, nonatomic) NSString *name;
@property (strong, nonatomic) NSString *qrcodeimg;
@property (strong, nonatomic) NSString *sex;
@property (strong, nonatomic) NSString *status;
@property (strong, nonatomic) NSString *token;
@property (strong, nonatomic) NSString *uuid;
@property (strong, nonatomic) MyEstate *myEstateList;


- (id)initWithCoder:(NSCoder *)aDecoder;
- (void)encodeWithCoder:(NSCoder *)aCoder;

+ (User *)parser:(id)responseObject;

user.m

#import "User.h"
#import <DCKeyValueObjectMapping.h>
#import <DCParserConfiguration.h>
#import <DCObjectMapping.h>

@implementation User

- (id)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super init]) {
        self.userId = [aDecoder decodeObjectForKey:@"userId"];
        self.headimg = [aDecoder decodeObjectForKey:@"headimg"];
        self.createtime = [aDecoder decodeObjectForKey:@"createtime"];
        self.integral = [aDecoder decodeObjectForKey:@"integral"];
        self.isadmin = [aDecoder decodeObjectForKey:@"isadmin"];
        self.mail = [aDecoder decodeObjectForKey:@"mail"];
        self.mobile = [aDecoder decodeObjectForKey:@"mobile"];
        self.name = [aDecoder decodeObjectForKey:@"name"];
        self.qrcodeimg = [aDecoder decodeObjectForKey:@"qrcodeimg"];
        self.sex = [aDecoder decodeObjectForKey:@"sex"];
        self.status = [aDecoder decodeObjectForKey:@"status"];
        self.token = [aDecoder decodeObjectForKey:@"token"];
        self.uuid = [aDecoder decodeObjectForKey:@"uuid"];
    }
    return self;
}

- (void)encodeWithCoder:(NSCoder *)aCoder {
    [aCoder encodeObject:self.userId forKey:@"userId"];
    [aCoder encodeObject:self.headimg forKey:@"headimg"];
    [aCoder encodeObject:self.createtime forKey:@"createtime"];
    [aCoder encodeObject:self.isadmin forKey:@"isadmin"];
    [aCoder encodeObject:self.mail forKey:@"mail"];
    [aCoder encodeObject:self.mobile forKey:@"mobile"];
    [aCoder encodeObject:self.name forKey:@"name"];
    [aCoder encodeObject:self.qrcodeimg forKey:@"qrcodeimg"];
    [aCoder encodeObject:self.sex forKey:@"sex"];
    [aCoder encodeObject:self.status forKey:@"status"];
    [aCoder encodeObject:self.token  forKey:@"token"];
    [aCoder encodeObject:self.uuid forKey:@"uuid"];
}

+ (User *)parser:(id)responseObject {
    DCKeyValueObjectMapping *parser = [DCKeyValueObjectMapping mapperForClass: [User class]];
    return [parser parseDictionary:[responseObject objectForKey:@"data"]];
}

NSUserDefaults存储user

- (void)saveUser:(User *)user {
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:[NSKeyedArchiver archivedDataWithRootObject:user] forKey:DefaultUser];
}

NSUserDefaults查询user

- (User *)fetchUser {
    NSData *userData = [[NSUserDefaults standardUserDefaults] objectForKey:DefaultUser];
    if (userData) {
        User *user = [NSKeyedUnarchiver unarchiveObjectWithData:userData];
        return user;
    }
    return nil;
}