Dispatch For Mac
I’ve been working on a Mac app lately, and while some things are similar to iOS, something are definitely different. One thing that is different are modal windows and run loops. When you display a modal view on iOS you don’t get a new run loop for the view, but when you display a modal window on OS X a new run loop is created for the window. This is not necessarily a big deal unless you have a habit of using to dispatch work between background and main queues. Let me give a more specific example.
I display a modal view, or in the cause of OS X, a modal window. The current view is managed by a view controller. User input is captured, then a URL request is sent off to a server on the Internet. The view controller is then notified when the URL request completes.
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The typical pattern I follow for sending the request to the server and getting notified when done is to call a method that will dispatch the URL request to a background queue then dispatch to the main queue to call a block when complete. It looks something like this. From the for +NSApp runModalForWindow:: “This method runs a modal event loop for the specified window synchronously. It displays the specified window, makes it key, starts the run loop, and processes events for that window. (You do not need to show the window yourself.) While the app is in that loop, it does not respond to any other events (including mouse, keyboard, or window-close events) unless they are associated with the window. It also does not perform any tasks (such as firing timers) that are not associated with the modal run loop. In other words, this method consumes only enough CPU time to process events and dispatch them to the action methods associated with the modal window.” Posted in.
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