Handle a few operations per one view controller

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Dear Mugunth, I'm using MKNetworkKit and would like to do all network stuff in my
app as nice as possible =)

The question is what to do when our view controller needs information from several
requests (i.e. in first request we got json data with text and links to images and
also we will have a couple of requests for all images). When we leave this
viewController we would like to cancel all network operations. What is an
appropriate way to do this?

My variant you could see below. What do you think about this solution?

Thanks in advance!

OperationsController.h

@interface OperationsController : NSObject

- (void)addOperation:(MKNetworkOperation *)operation;
- (void)cancelAllOperations;

@end

OperationsController.m

#import "OperationsController.h"

@interface OperationsController () {
    NSMutableDictionary *operations;
}
@end

@implementation OperationsController

- (id)init {
    self = [super init];
    if (self) {
        operations = [NSMutableDictionary dictionary];
    }
    return self;
}

- (void)dealloc {
    [self cancelAllOperations];
}

#pragma mark - Operation

- (void)addOperation:(MKNetworkOperation *)operation {
    NSString *key = [operation uniqueIdentifier];
    NSOperation *oldOperation = [operations objectForKey:key];
    if (oldOperation) {
        [oldOperation.dependencies makeObjectsPerformSelector:@selector(cancel)];
        [oldOperation cancel];
        [operations removeObjectForKey:key];
    }
    if (operation) {
        [operations setObject:operation forKey:key];
    }
}

- (void)cancelAllOperations {
    for (id key in operations) {
        MKNetworkOperation *operation = [operations objectForKey:key];
        [operation.dependencies makeObjectsPerformSelector:@selector(cancel)];
        [operation cancel];
    }
    [operations removeAllObjects];
}

@end

SampleViewController.h

@interface SampleViewController : UIViewController

@end

SampleViewController.m

#import "SampleViewController.h"
#import "OperationsController.h"

@interface SampleViewController ()
@property (nonatomic, retain) OperationsController *operationsController;
@end

@implementation SampleViewController

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        self.operationsController = [[OperationsController alloc] init];
    }
    return self;
}

- (void)dealloc {
    [self.operationsController cancelAllOperations];
}

#pragma mark -

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    MKNetworkOperation *firstOperation = ...
    [self.operationsController addOperation:firstOperation]
    MKNetworkOperation *secondOperation = ...
    [self.operationsController addOperation:secondOperation]
    ...
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [self.operationsController cancelAllOperations];
}

@end

great, thank a lot! =)