NSOperation and UIKit problem

Posted by Infinity on Stack Overflow See other posts from Stack Overflow or by Infinity
Published on 2010-04-15T11:21:38Z Indexed on 2010/04/15 11:23 UTC
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Filed under:

objective-c

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nsoperation

|

iphone-sdk

Hello guys!

I am doing my download with an object which was inherited from NSOperation. I have read the documentation and when my operation finished I must call the

[self.delegate performSelectorOnMainThread:@selector(operationDidFinish:) withObject:self waitUntilDone:YES];

method. It needs to be called on the main thread, because the UIKit is not thread safe and the documentation says this in these non thread safe frameworks cases. In the delegate method I am drawing a pdf or an image, but because it is drawn on the main thread the User Interface is very laggy until the drawing is finished. Maybe can you suggest me a good way to avoid this problem?

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