Question

我正在尝试将带有图像的新托管对象发布到Web数据库，如下所示，除了小怪异的bug之外，一切正常。成功上载托管对象后，将向UITableView添加2行而不是1行。当我刷新UITableView时，之前添加的UITableViewCell之一正在填充上传的图像。当我重建应用程序时，一切正常。以前添加的托管对象正确显示，无需重复。有没有人可以看看我的代码并告诉我该错误的原因是什么，我该如何解决？如果您需要更多代码，请与我们联系。

 -(void)postRequest{
NSEntityDescription *watchEntityDesc = [NSEntityDescription entityForName:@"Watches" inManagedObjectContext:[[RKObjectManager sharedManager]managedObjectStore].mainQueueManagedObjectContext];

Watches *watch = [[Watches alloc]initWithEntity:watchEntityDesc insertIntoManagedObjectContext:[[RKObjectManager sharedManager]managedObjectStore].mainQueueManagedObjectContext];
watch.phonewatchno = @"124512";
watch.latitude = [NSNumber numberWithDouble:-33.856870];
watch.longitude  = [NSNumber numberWithDouble:151.215279];


NSEntityDescription *wearersEntityDesc = [NSEntityDescription entityForName:@"Wearers" inManagedObjectContext:[[RKObjectManager sharedManager]managedObjectStore].mainQueueManagedObjectContext];

Wearers *wearer = [[Wearers alloc]initWithEntity:wearersEntityDesc insertIntoManagedObjectContext:[[RKObjectManager sharedManager]managedObjectStore].mainQueueManagedObjectContext];
wearer.name =_nameTextField.text,
wearer.watches =[NSSet setWithObject:watch];

RKEntityMapping *watchesMapping = [RKEntityMapping mappingForEntityForName:@"Watches" inManagedObjectStore:[[EFDateModel sharedDataModel]objectStore]];
[watchesMapping addAttributeMappingsFromDictionary:@{

                                                     @"id": @"watch_id",
                                                     @"latitude":@"latitude",
                                                     @"longitude":@"longitude",
                                                     @"phonewatchno":@"phonewatchno",

                                                     }
 ];

[watchesMapping addConnectionForRelationship:@"wearer" connectedBy:@{
                                                                     @"wearer_id":@"wearer_id"
                                                                     }];
[watchesMapping setIdentificationAttributes:@[@"watch_id"]];

RKResponseDescriptor *responseDescr = [RKResponseDescriptor responseDescriptorWithMapping:watchesMapping method:RKRequestMethodPOST pathPattern:@"/watches.json" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];


[[RKObjectManager sharedManager]addResponseDescriptor:responseDescr];

RKEntityMapping *wearersMapping = [RKEntityMapping mappingForEntityForName:@"Wearers" inManagedObjectStore:[[EFDateModel sharedDataModel] objectStore]];

[wearersMapping addAttributeMappingsFromDictionary:@{
                                                     @"id":@"wearer_id",
                                                     @"name":@"name",

                                                     }
 ];
wearersMapping.identificationAttributes = @[@"wearer_id"];

[wearersMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"watch" toKeyPath:@"watches" withMapping:watchesMapping]];


RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:wearersMapping method:RKRequestMethodPOST pathPattern:@"/wearers.json" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];


RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:[wearersMapping inverseMapping]  objectClass:[Wearers class] rootKeyPath:nil method:RKRequestMethodPOST ];

[[RKObjectManager sharedManager]addResponseDescriptor:responseDescriptor];
[[RKObjectManager sharedManager]addRequestDescriptor:requestDescriptor];

[[RKObjectManager sharedManager]setRequestSerializationMIMEType:RKMIMETypeJSON];
[[RKObjectManager sharedManager]setAcceptHeaderWithMIMEType:@"application/json"];




UIImage *image =[UIImage imageWithCGImage:_wearerImage.CGImage scale:0.4 orientation:UIImageOrientationUp];
NSMutableURLRequest *request = [[RKObjectManager sharedManager] multipartFormRequestWithObject:wearer method:RKRequestMethodPOST path:@"/wearers.json" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [formData appendPartWithFileData:UIImagePNGRepresentation(image)
                                name:@"wearer_photo"
                            fileName:@"photo.png"
                            mimeType:@"image/png"];
}];

NSManagedObjectContext *moc =[[[RKObjectManager sharedManager]managedObjectStore]mainQueueManagedObjectContext];
RKManagedObjectRequestOperation *managedObjectOperation = [[RKObjectManager sharedManager]managedObjectRequestOperationWithRequest:request managedObjectContext:moc success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSLog(@"Mapping result  = %@",mappingResult.array);
    [[RKObjectManager sharedManager]removeResponseDescriptor:responseDescriptor];
    [[RKObjectManager sharedManager]removeRequestDescriptor:requestDescriptor];
    [[NSNotificationCenter defaultCenter]
     postNotificationName:@"ReloadTable"
     object:self];
    [self dismissViewControllerAnimated:YES completion:nil];
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
    NSLog(@"Error : \n %@",error.description);
}];
[[RKObjectManager sharedManager] enqueueObjectRequestOperation:managedObjectOperation];
}

干杯

Answer 1

每次调用此方法时，您都会调用alloc]initWithEntity:... insertIntoManagedObjectContext:两次并创建两个新的实体实例。您可能应该将实体实例传递给它使用的此方法，而不是创建任何新实例。

此外，继续创建新描述符并添加和删除它们是低效的。如果您尝试同时发出2个请求，则会出现错误。首次使用之前配置对象管理器一次，然后重复使用它而不重新配置。

使用Restkit上传图像 - 向UITableView添加两行而不是一行

1 个答案: