iOS NSUserDefaults缓存自定义实体类

NSUserDefaults支持的数据类型：NSString，NSNumber（NSInteger、float、double）,NSArray，NSDictionary，NSDate，BOOL。

如果需要缓存自定义的数据类型，需要遵循NSCoding协议，然后实现NSCoding的两个协议方法，归档与反归档。

例如我们要保存一个新闻列表的数据 .h文件

@interface newsList : NSObject

@property (nonatomic,copy)NSString *newsId;

@property (nonatomic,copy)NSString *title;

@property (nonatomic,copy)NSString *contentUrl;

@end

@interface newsListModelData : NSObject

@property (nonatomic, strong)NSArray *newsList;

@end

@interface newsListModel : BaseModel

@property (nonatomic, strong)newsListModelData *data;

@end

.m 文件，实现NSCoding的协议方法

@implementation newsList

- (id)initWithCoder:(NSCoder *)aDecoder {

    if (self = [super init]) {

        self.newsId = [aDecoder decodeObjectForKey:@"newsId"];

        self.title = [aDecoder decodeObjectForKey:@"title"];

        self.contentUrl = [aDecoder decodeObjectForKey:@"contentUrl"];

    }

    return self;

}

- (void)encodeWithCoder:(NSCoder *)aCoder{

    [aCoder encodeObject:self.newsId forKey:@"newsId"];

    [aCoder encodeObject:self.title forKey:@"title"];

    [aCoder encodeObject:self.contentUrl forKey:@"contentUrl"];

}

@end

@implementation  newsListModelData

+(NSDictionary *)mj_objectClassInArray {

    return @{@"newsList" : @"newsList"};

}

- (id)initWithCoder:(NSCoder *)aDecoder {

    if (self = [super init]) {

        self.newsList = [aDecoder decodeObjectForKey:@"newsList"];

    }

    return self;

}

- (void)encodeWithCoder:(NSCoder *)aCoder{

    [aCoder encodeObject:self.processUrl forKey:@"processUrl"];

    [aCoder encodeObject:self.statementUrl forKey:@"statementUrl"];

    [aCoder encodeObject:self.newsList forKey:@"newsList"];

}

@end

@implementation newsListModel

- (id)initWithCoder:(NSCoder *)aDecoder {

    if (self = [super init]) {

        self.data = [aDecoder decodeObjectForKey:@"data"];

    }

    return self;

}

- (void)encodeWithCoder:(NSCoder *)aCoder{

    [aCoder encodeObject:self.data forKey:@"data"];

}

@end

创建一个类存储数据和读取数据的方法 .h文件

+(void)setNewListModel:(newsListModel *)value;

+(newsListModel *)getNewListModel;

.m文件实现方法

定义一个唯一的宏变量

#define kUserDefaultsNewsListModel @"newsList"

+(void)setNewListModel:(newsListModel *)value {

    NSData *myEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:value];

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    [defaults setObject:myEncodedObject forKey:kUserDefaultsNewsListModel];

    [[NSUserDefaults standardUserDefaults] synchronize];

}

+(newsListModel *)getNewListModel {

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    NSData *myEncodedObject = [defaults objectForKey:kUserDefaultsNewsListModel];

    return (newsListModel *)[NSKeyedUnarchiver unarchiveObjectWithData:myEncodedObject];

}

获取到model数据之后进行保存

[NSUserDefaultsTools setNewListModel:companyModel];

读取model数据

newsListModel*model = [EdlNSUserDefaultsTools getNewListModel];