Summary
This chapter introduced several techniques to process long-running tasks without interfering with the UI, including performSelectorInBackground:withObject:, operation queues, and Grand Central Dispatch queues.
Using the performSelectorInBackground:withObject: method on NSObject to execute a task in the background is the simplest approach, but provides the least support and management.
Operation queues can process tasks concurrently or serially, using a method call, a block, or a custom operation class. Operation queues can be managed by specifying a maximum number of concurrent operations, they can be suspended and resumed, and all the outstanding operations can be canceled. Operation queues can handle custom operation classes. Operation ...
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