On 14 Jun '08, at 7:19 PM, David wrote:
I am using NSMutableArrays to hold the nodes in the tree. One thread is adding child nodes while the main thread maybe accessing the arrays through the data source. I find it hard to imagine that NSMutableArray could becausing the problem.
I don't think that's safe. I have seen no assurances that NSOutlineView is thread-safe, and in general most AppKit control classes should _not_ be accessed from background threads.
The best thing to do is have your background thread use - performSelectorOnMainThread:, calling a method on itself that will take the child nodes as a parameter and add them to the outline.
—Jens
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