Facebook API - How to cancel Graph Request

Question

I occasionally need to cancel a FaceBook graph request, but there seems to be no cancel or similar method in their API to do so. At the moment, crashes sometimes occur as th

Answer 1

For those of us who build the static library and are unable to access the implementation files, a category would be the best way to go.

For those of us who did not build the static library, using a category would be optimal as well because you don't need to modify the existing files.

Here is said category.

// Facebook+Cancel.h
#import "Facebook.h"

@interface Facebook (Facebook_cancel)

- (void)cancelPendingRequest:(FBRequest *)releasingRequest;

- (void)cancelAllRequests;

@end

And then the .m file

// Facebook+Cancel.m
#import "Facebook+Facebook_cancel.h"

@implementation Facebook (Facebook_cancel)

- (void)cancelPendingRequest:(FBRequest *)releasingRequest{
    [releasingRequest.connection cancel];
    if ([_requests containsObject:releasingRequest]) {
        [_requests removeObject:releasingRequest];
        [releasingRequest removeObserver:self forKeyPath:@"state"];

    }
}

- (void)cancelAllRequests {
    for (FBRequest *req in [_requests mutableCopy]) {
        [_requests removeObject:req];
        [req.connection cancel];
        [req removeObserver:self forKeyPath:@"state"];
    }
}

@end

For those using any other answer, you are causing a memory leak. The Facebook SDK will warn you through NSLog that you have not removed an observer. The fourth line in the cancelAllRequests method fixes this problem.