CODEWITHSUNDEEP
iphoneiosobjective-c
Satish Azad
Satish Azad

Reputation: 2312

How to Cancel all NSURLConnections in Background in iOS

I am downloading some Images (approx 200-300 thumb images) on Using NSURLCOnnections. I have array of urls of these images. The connection starts to download these images. But in certain case i want to cancel all these downloading. How it is possible. Can i cancel all these NSURLConnections.

Upvotes: 2

Views: 1165

Answers (3)

Ivan Lisovyi
Ivan Lisovyi

Reputation: 538

Will be better to create NSOperationQueue and work with NSURLConnection through this queue.

For example: 

NSOperationQueue *queue = [NSOperationQueue new];
NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(sendRequest)];


- (void) sendRequest {
    NSURL *url = [NSURL URLWithString:@"http://www.google.com"];
    NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
    NSURLConnection *theConnection = [[[NSURLConnection alloc] initWithRequest:theRequest delegate:self] autorelease];
    ...
}

NSOperationQueue has method cancelAllOperations

Upvotes: 4

zoul
zoul

Reputation: 104065

I would use a synchronous NSURLConnection in combination with an NSOperationQueue to download the data:

[queue addOperationWithBlock:^{
    NSData *data = [NSURLConnection
        sendSynchronousRequest:…
        returningResponse:… error:…];
}];

This way you can easily control the number of concurrent downloads and cancel the unfinished ones using [queue cancelAllOperations]. Note that cancelling the queue won’t stop the downloads that have already started, but that won’t be a problem if you’re downloading just small thumbnails and have a decent concurrent download limit.

Synchronous NSURLConnection mode has the advantage of being much easier to use than the asynchronous delegation API.

Upvotes: 0

DivineDesert
DivineDesert

Reputation: 6954

[connection cancel] is used to cancel an NSURLConnection.

Upvotes: 2

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