将 NSobject 数据存储到 Nsuserdefaults

Posted 2023-02-27

【中文标题】将 NSobject 数据存储到 Nsuserdefaults

【英文标题】：store NSobject data into Nsuserdefaults

【发布时间】：2016-09-19 14:37:34

【问题描述】：

在我的模态对象中有两个值 我正在尝试存储在 NSUserDefaults 中。这是我的代码

接口文件：

@interface collectionModel : NSObject <NSCoding> 



@property(nonatomic,retain) NSString *name;
@property(nonatomic,retain) NSString *author;

实施文件：

@implementation collectionModel
@synthesize name = _name;
@synthesize author = _author;


- (id)initWithCoder:(NSCoder *)aDecoder 

    if (self = [super init]) 
        self.name = [aDecoder decodeObjectForKey:@"name"];
        self.author = [aDecoder decodeObjectForKey:@"author"];
    
    return self;


- (void)encodeWithCoder:(NSCoder *)aCoder 
    [aCoder encodeObject:_name forKey:@"name"];
    [aCoder encodeObject:_author forKey:@"author"];

ViewController.M

#import "collectionModel.h"

 parsedCollectionArr = [[NSMutableArray alloc] init];

 for (NSDictionary *obj in collectionBalk) 

          NSString * Name = [obj objectForKey:@"Name"];
          NSString * author = [obj objectForKey:@"author"];

          collectionModel *dataObj = [[collectionModel alloc] init];
          dataObj.name = Name;
          dataObj.author = author;
          [parsedCollectionArr addObject:dataObj];
     
 NSLog(@"parsedCollectionArr count ---->>>> %d",23);

在这里，我想将这个 parsedCollectionArr 存储在 NSUserDefaults 中并从中检索。任何人都可以帮助我。

【问题讨论】：

How to save NSMutablearray in NSUserDefaults的可能重复

也请参考***.com/questions/2315948/…

关注@Teja Nandamuri 建议的链接

@KuntalGajjar。你可以，使用 NSCoding。

【参考方案1】：

试试这个.. 创建一个类似“CollectionModelManager.h and .m”的类

//用于保存CollectionModel

+ (void)saveCollectionModel:(CollectionModel *) collectionModel 
  
 NSData *encodedData = [NSKeyedArchiver archivedDataWithRootObject:collectionModel];
    NSUserDefaults *userDef = [NSUserDefaults standardUserDefaults];
    [userDef setObject:encodedData forKey:kCollectionModelKey]; //here kCollectionModelKey is a static string
    [userDef synchronize];

//获取CollectionModel

+ (CollectionModel *)getCollectionModel 

    NSUserDefaults *userDef = [NSUserDefaults standardUserDefaults];
    CollectionModel *collectionModel = nil;
    NSData *encodedData = [userDef objectForKey:kCollectionModelKey]; //Same static string use here kCollectionModelKey
    if (encodedData != nil) 
        collectionModel = [NSKeyedUnarchiver unarchiveObjectWithData:encodedData];
    
    return collectionModel;