ios - 如何在 Objective c 的 Core Data 中添加数组作为字符串

Question

我是 iOS 的新手，我面临着将 NSArray 作为 NSString 添加到 Core Data 中的问题。

我正在使用这样的代码:

NSManagedObjectContext *context = [self managedObjectContext];
//Converting array as an string...
AuditIDCoreData=[NSString stringWithFormat:@"%@",idAuditarray];
AuditnameCoreData=[NSString stringWithFormat:@"%@",nameAuditarray];

NSError *error;

NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:[NSEntityDescription entityForName:@"Get_Auditnames_User" inManagedObjectContext:context]];

//  NSError *error = nil;
NSArray *results = [context executeFetchRequest:request error:&error];
NSLog(@"Result =%@",results);

NSString *Stringaudit =[NSString stringWithFormat:@"%@",idAuditarray];

ComplareArray=[devices valueForKey:@"auditname"];
ComplareArray2=[devices valueForKey:@"auditid"];

BOOL contains = [ComplareArray2 containsObject:Stringaudit];

if(contains == YES)
{
}
else
{
    if (self.device) {
        // Update existing device
        [self.device setValue:AuditIDCoreData forKey:@"auditid"];
        [self.device setValue:AuditnameCoreData forKey:@"auditname"];
    } else {
        // Create a new device
        NSManagedObject *newDevice = [NSEntityDescription insertNewObjectForEntityForName:@"Get_Auditnames_User" inManagedObjectContext:context];
        //  NSLog(@"context",newDevice);
        [newDevice setValue:AuditIDCoreData forKey:@"auditid"];
        [newDevice setValue:AuditnameCoreData forKey:@"auditname"];
    }

    //NSError *error = nil;
    // Save the object to persistent store
    if (![context save:&error]) {
        NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]);
    }
}

我更新的代码:

NSString *FailString =@"";
NSString *WarningString =@"";

NSManagedObjectContext *context = [self managedObjectContext];

for (int i = 0; i < idarray.count; i++){
    if (self.device) {
        // Update existing device
        [device setValue:Audit forKey:@"auditnameId"];
        [device setValue:Passarray[i] forKey:@"checklistid"];
        [device setValue:CheckpointNameIDArray[i] forKey:@"checkpointid"];
        [device setValue:FailString forKey:@"failreason"];
        [device setValue:WarningString forKey:@"warningreason"];
        [device setValue:AuditStartDate forKey:@"starttimedate"];
        [device setValue:userid forKey:@"userid"];
        [device setValue:imageArray[i] forKey:@"auditimage"];

        NSError *error = nil;
        // Save the object to persistent store
        if (![context save:&error]) {
            NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]);
        } 
    } else {
        // Create a new device
        NSManagedObject *newDevice = [NSEntityDescription insertNewObjectForEntityForName:@"AuditPost" inManagedObjectContext:context];
        [newDevice setValue:Audit forKey:@"auditnameId"];
        [newDevice setValue:Passarray[i] forKey:@"checklistid"];
        [newDevice setValue:CheckpointNameIDArray[i] forKey:@"checkpointid"];
        [newDevice setValue:FailString forKey:@"failreason"];
        [newDevice setValue:WarningString forKey:@"warningreason"];
        [newDevice setValue:AuditStartDate forKey:@"starttimedate"];
        [newDevice setValue:userid forKey:@"userid"];
        [newDevice setValue:imageArray[i] forKey:@"auditimage"];

        NSError *error = nil;
        // Save the object to persistent store
        if (![context save:&error]) {
            NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]);
        }           
    }
}

但它将整个数组保存在一个字符串中。我需要将数组元素作为字符串一个一个地存储在核心数据中。

这怎么可能？

Answer 1

可以通过简单的步骤完成。

AppDelegate *appDelegate =
[[UIApplication sharedApplication] delegate];

NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSManagedObject *newData;
for (int i = 0; i < array1.count; i++){
    newData = [NSEntityDescription insertNewObjectForEntityForName:@"yourEntityName" inManagedObjectContext:context];
    [newData setValue:array1[i] forKey:@"sub-entities"];    
    [newData setValue:array2[i] forKey:@"sub-entities"];        
}

NSError *error = nil;
// Save the object to persistent store
if (![context save:&error]) {
    NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]);
}else {
    NSLog(@"Data saved successfully ..");
}

保存多个数组 array1 & array2 到一个实体的子实体。