存储自定义类iOS 8核心数据

Question

我使用的是API，它们的类似乎不符合Core数据。

我试图存储AftershipCheckpoint和AftershipTracking的类

用于.h的AftershipTracking文件如下

@interface AftershipTracking : NSObject

@property (nonatomic, strong) NSString* createTime;
@property (nonatomic, strong) NSString* updateTime;
@property (nonatomic, strong) NSString* identifier;
@property (nonatomic, strong) NSString* trackingNumber;
@property (nonatomic, strong) NSString* trackingPostalCode;
@property (nonatomic, strong) NSString* trackingShipDate;
@property (nonatomic, strong) NSString* trackingAccountNumber;
@property (nonatomic, strong) NSString* slug;
@property (nonatomic) bool isActive;
@property (nonatomic, strong) NSDictionary* customFields;
@property (nonatomic, strong) NSString* customName;
@property (nonatomic, strong) NSNumber* deliveryTime;
@property (nonatomic, strong) NSString* destionationCountryCode;
@property (nonatomic, strong) NSArray* emails;
@property (nonatomic, strong) NSString* expectedDeliveryDate;
@property (nonatomic, strong) NSString* orderId;
@property (nonatomic, strong) NSString* orderIdPath;
@property (nonatomic, strong) NSString* originCountryCode;
@property (nonatomic, strong) NSString* uniqueToken;
@property (nonatomic, strong) NSNumber* shipmentPackageCount;
@property (nonatomic, strong) NSString* shipmentType;
@property (nonatomic, strong) NSNumber* shipmentWeight;
@property (nonatomic, strong) NSString* shipmentWeightUnit;
@property (nonatomic, strong) NSString* signedBy;
@property (nonatomic, strong) NSArray* smses;
@property (nonatomic, strong) NSString* source;
@property (nonatomic, strong) NSString* tag;
@property (nonatomic, strong) NSString* title;
@property (nonatomic, strong) NSNumber* trackedCount;
@property (nonatomic, strong) NSArray* checkpoints;


- (NSString *)description;

它包含一个AftershipCheckpoint数组，所以我想我也需要配置这个类。

@interface AftershipCheckpoint : NSObject

@property (nonatomic, strong) NSDate* createTime;
@property (nonatomic, strong) NSString* slug;
@property (nonatomic, strong) NSString* checkpointTime;
@property (nonatomic, strong) NSString* city;
@property (nonatomic, strong) NSString* state;
@property (nonatomic, strong) NSString* countryCode;
@property (nonatomic, strong) NSString* countryName;
@property (nonatomic, strong) NSString* message;
@property (nonatomic, strong) NSString* tag;
@property (nonatomic, strong) NSString* zip;

- (NSString *)description;

我的应用程序有一个AftershipTracking数组，如何使用数据存储持久数据数组，或者是否有更好的选择？

Answer 1

为了从您的模型中删除一个跟踪，它将如下所示。

- (void)remove:(AftershipTracking *)package
{
    [_packages removeObject:package];
    [_delivered removeObject:package];
    [_inProgress removeObject:package];

    AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
    NSManagedObjectContext *context = [appDelegate managedObjectContext];
    NSEntityDescription *entityDesc = [NSEntityDescription entityForName:@"Tracking" inManagedObjectContext:context];
    NSFetchRequest *request = [[NSFetchRequest alloc] init];
    [request setEntity:entityDesc];
    NSPredicate *pred =[NSPredicate predicateWithFormat:@"(trackingNumber = %@)", package.trackingNumber];
    [request setPredicate:pred];

    NSManagedObject *match = nil;

    NSError *error;
    NSArray *objects = [context executeFetchRequest:request error:&error];
    match = objects.firstObject;
    [context deleteObject:match];

    [self sort];
    [context save:&error];
}

Answer 2

那里的所有东西似乎都准备好了使用NSCoding来实现持久性。首先，根据可以将这些数组保存到NSUserDefaults中的大小而定，或者您可以启动一个Core并尝试使用plist进行持久化处理。通常，首先要确保您的逻辑是正确的，方法是使用人类可读的formate (在iOS的情况下是plist)，然后一旦得到了，就将存储切换到使用SQLite，但是只有在有数千个对象要持久化的情况下才真正需要这样做。

使用NSUserDefaults，只要AftershipTracking符合NSCoding，数组就会保存在AftershipCheckpoint的列表中。

Answer 3

在AftershipTracking中，

• 将isActive更改为NSNumber。作为一个NSNumber，它可以保存在CoreData中。
• 我猜checkpoints是AftershipCheckpoint对象的数组。这可以设置为模型中的多个关系，这将将类型更改为NSSet。当您从NSSet中检索出CoreData时，可以将其转换为带有[checkpoints allObjects]的数组。
• 其他NSArray和NSDictionary的对象需要是可转换对象。

在AftershipCheckpoint中，

• 这个类很好，因为它是一堆NSString和NSDate。

这两个类都需要是NSManagedObjectModel的子类。通过常规的核心数据建模选项(一定要导入核心数据框架)创建它们可能是个好主意。查看核心数据上的这是Ray Wenderlich教程。