Hi, how to cancel operation which is performing?
I think it is not safe: - (void) beginOperation { [_operation cancel]; _operation = [[Operation alloc] initWithURL: [NSURL URLWithString: @" http://rss.cnn.com/rss/cnn_topstories.xml"]]; _queue = [NSOperationQueue new]; [_operation addObserver: self forKeyPath: @"isFinished" options: NSKeyValueObservingOptionNew context: NULL]; [_operation addObserver: self forKeyPath: @"isCancelled" options: NSKeyValueObservingOptionNew context: NULL]; [_queue addOperation: _operation]; } - (void) observeValueForKeyPath: (NSString *) keyPath ofObject: (id) object change: (NSDictionary *) change context: (void *) context { if ([keyPath isEqualToString: @"isFinished"]) { if ([[change valueForKey: NSKeyValueChangeNewKey] boolValue]) { [rootViewController performSelectorOnMainThread: @selector(setItemList:) withObject: [_operation itemList] waitUntilDone: NO]; static BOOL firstTime = YES; if (firstTime) { [self performSelectorOnMainThread: @selector(setRootView:) withObject: nil waitUntilDone: NO]; firstTime = NO; } } } else if ([keyPath isEqualToString: @"isCancelled"]) { if ([[change valueForKey: NSKeyValueChangeNewKey] boolValue]) { if ([_operation error]) { [self performSelectorOnMainThread: @selector(errorOccurs:) withObject: [_operation error] waitUntilDone: NO]; } } } [_operation removeObserver: self forKeyPath: @"isFinished"]; [_operation removeObserver: self forKeyPath: @"isCancelled"]; [_operation release]; _operation = nil; [_queue release]; _queue = nil; } -- best regards Ariel _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com