如何保存自定义对象数组并将其存储在NSUserDefaults的 - iPhone [英] How to save custom objects in array and store it in NSUserDefaults - iPhone

问题描述

我之后按钮的操作方法让我的自定义类对象。现在我需要多个自定义对象存储在的NSMutableArray ，然后存储在该数组中 NSUserDefaults的。

I am getting my custom class object after button action method. Now I need to store multiple custom objects in NSMutableArray and then store this array in NSUserDefaults.

下面是我的code：

-(IBAction)onClickSubmitLater:(id)sender
{
    //Saving store in user defaults for later upload data.

    NSMutableArray *arrayStoreList = [[NSMutableArray alloc] init];
    arrayStoreList = [Util getArrayPreference:@"Store"];//arrayStoreList is the list of all stores.

    Store *store = [[Store alloc] init];
    store = [arrayStoreList objectAtIndex:self.selectedStoreIndex];//here i am getting particular store that i need to save in array.

    //archive
    NSData *dataStore = [NSKeyedArchiver archivedDataWithRootObject:store];
    [[NSUserDefaults standardUserDefaults] setObject:dataStore forKey:@"resultStore"];

    //unarchive
    NSData *dataResultStore = [[NSUserDefaults standardUserDefaults] objectForKey:@"resultStore"];

    Store *resultStore = (Store *)[NSKeyedUnarchiver unarchiveObjectWithData:dataResultStore];
    NSLog(@"%@", resultStore);
}

以上$ C $下使用时，它是在 NSUserDefaults的保存单定制类商店对象。所以我想在其中保存的NSMutableArray 所有商店对象提交后IBAction为后。后来，我将通过一个在服务器都有一个上传存储读取存储阵列。

Using above code, it is saving single Custom class Store object in NSUserDefaults. So I would like to save all Store object in NSMutableArray after submit later ibaction. Later, I will fetch array of stores for uploading store on server one by one.

感谢。

推荐答案

要存储和检索与用户的默认值自定义对象的数组，你可以使用下面的方法：

To store and retrieve array with custom object on user defaults you can use following methods:

-(void)writeArrayWithCustomObjToUserDefaults:(NSString *)keyName withArray:(NSMutableArray *)myArray
{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSData *data = [NSKeyedArchiver archivedDataWithRootObject:myArray];
    [defaults setObject:data forKey:keyName];
    [defaults synchronize];
}

-(NSArray *)readArrayWithCustomObjFromUserDefaults:(NSString*)keyName
{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSData *data = [defaults objectForKey:keyName];
    NSArray *myArray = [NSKeyedUnarchiver unarchiveObjectWithData:data];
    [defaults synchronize];
    return myArray; 
}

但要确保你已经实施

But make sure you have implemented

- (void) encodeWithCoder : (NSCoder *)encode ;
- (id) initWithCoder : (NSCoder *)decode;

在数据模型类方法来避免碰撞为以下几个方面：

method in data model class to avoid crash as followings:

- (void)encodeWithCoder:(NSCoder *)coder;
{
    [coder encodeObject:label forKey:@"label"];
    [coder encodeInteger:numberID forKey:@"numberID"];
}

- (id)initWithCoder:(NSCoder *)coder;
{
    self = [super init];
    if (self != nil)
    {
        label = [[coder decodeObjectForKey:@"label"] retain];
        numberID = [[coder decodeIntegerForKey:@"numberID"] retain];
    }   
    return self;
}

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