More iPhone cool projects : cool developers reveal the by Danton Chin

By Danton Chin

Offers info on growing functions for the iPhone.

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Even so, if you carry either of these alternatives to their logical conclusion, the following questions emerge: How many threads do you spawn? What is the optimal number of threads to spawn? It would be easy to see that you could end up in a situation where the application spawns enough threads to bring your application to a grinding halt. But wait, isn’t there a solution for that? Concurrency with Operation Objects Need work done on a background thread? Think operation objects! Why use operation objects?

The delegate at a minimum needs to implement the methods connection:didReceiveResponse:, connection:didReceiveData:, connection:didFailWithError:, and connectionDidFinishLoading:. Sometimes these asynchronous methods may be all your application needs. At the next level up support for concurrency solutions starts right from the root object— NSObject. NSObject provides support for spawning a thread with the method performSelectorInBackground:withObject: that creates a detached thread using the named method as the entry routine for the new thread.

Finally, change the viewWillAppear: method to kick off the fetchInterestingnessList method on a background thread. - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; [self loadInterestingnessList]; [self performSelectorInBackground:@selector(fetchInterestingnessList) withObject:nil]; } CHAPTER 1: Using Concurrency to Improve the Responsiveness of iPhone and iPad Applications NOTE: This version of the project is in the folder Interestingness-Version3. Build and run it on a device.

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