More iPhone Cool Projects (Books for Professionals by by Ben Smith

By Ben Smith

This publication stocks the secrets and techniques of the good iPhone apps being equipped at the present time through the easiest iPhone developers—invaluable wisdom for somebody who desires to create the app that everybody is speaking about.
What you’ll learn
-Game improvement with cohesion and iPhone OpenGL
-Unit checking out and iPhone-specific checking out tools
-How to process and remedy advanced app improvement roadblocks
-The top code absolutely defined and provided with screenshots

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Extra info for More iPhone Cool Projects (Books for Professionals by Professionals)

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Alternatively, a new NSThread object (see Figure 1–8) could be initialized and started: NSThread *fetchThread = [[NSThread alloc] initWithTarget:self selector:@selector(fetchImage:) object:url]; [fetchThread start]; Figure 1–8. A possible solution would be to spawn off a thread for each RESTful request to fetch an image. 23 24 CHAPTER 1: Using Concurrency to Improve the Responsiveness of iPhone and iPad Applications You could create an NSDictionary object to track and cache each image object using the image url as a key and determine whether you need to spawn a new thread to fetch the image.

The addition of each operation to the operation queue is enclosed in a @try—@catch block. If there is an error, an alert is presented with the reason. Don’t forget to release the operations and the queue in the dealloc method as follows: -(IBAction)buttonPressed:(id)sender { switch ([sender tag]) { case 0: /* * get operation count button pressed */ { NSArray *opArray = [workQueue operations]; [operationCountOutput setText:[NSString stringWithFormat:@"%d", [opArray count]]]; } break; case 1: /* * Add JobA button pressed */ [self addOp:jobA]; break; case 2: /* * Add JobB button pressed */ [self addOp:jobB]; break; case 3: /* * Add JobC button pressed */ [self addOp:jobC]; break; 35 36 CHAPTER 1: Using Concurrency to Improve the Responsiveness of iPhone and iPad Applications default: break; } } -(void)addOp:(JobUnit *)job { UIAlertView *alert; @try { [workQueue addOperation:job]; } @catch (NSException * exception) { alert = [[UIAlertView alloc] initWithTitle:@"NSOperationQueue Error:" message:[exception reason] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; } } - (void)dealloc { [jobA release]; [jobB release]; [jobC release]; [workQueue release]; [super dealloc]; } Build and run it.

Responding to cancellation is entirely voluntary. To determine whether the operation has been cancelled, use the isCancelled method and if it returns YES free up memory and exit immediately. The isCancelled method should be called:  Before any work is performed  At the beginning of an iteration loop and within the body of a long iteration  Anywhere you can The implementation of the selector that performs the work in an NSInvocationOperation should also respond to cancellations. Building HelloOperationQueues—a Toy Application To make some of these ideas more concrete we’ll develop a toy application to add and remove operations from a queue as pictured in Figure 1–11.

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