More iPhone Cool Projects: Cool Developers Reveal the by Danton Chin

By Danton Chin

Everyone is constructing iPhone purposes, and it truly is transparent why. The iPhone is the good cellular machine on hand, and the App shop makes it basic to get an program out into the unstoppable iPhone app marketplace. With millions of app builders getting into the sport, it really is an important to benefit from those that have truly succeeded. This publication exhibits you the way one of the most cutting edge and artistic iPhone program builders have constructed cool, best-selling apps.

Not merely does each winning program have a narrative, yet at the back of each nice app is superb code. during this publication, you will see the code and easy methods to use it to make your individual cool functions. you will study every little thing from uploading 3D paintings resources into your iPhone online game to utilizing Cocos2d for iPhone and iPad. This publication stocks the secrets and techniques of the best iPhone apps being equipped this present day via the easiest iPhone developers—invaluable wisdom for someone who desires to create the app that everybody is speaking about.

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Extra resources for More iPhone Cool Projects: Cool Developers Reveal the Details of Their Cooler Apps and Discuss Their iPad Development Experiences

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To start, you’ll create a nonconcurrent subclass of NSOperation to perform the loading of the images in the background. Click on the Classes folder and control-click to add a new file choosing the Objective-C template and name the class FetchImageOperation. Be sure that the checkbox to create the header file is selected. h> @interface FetchImageOperation : NSOperation { NSURL *imageURL; id targetObject; SEL targetMethod; } -(id)initWithImageURL:(NSURL *)url target:(id)targClass targetMethod:(SEL)targClassMethod; @end On the implementation side for FetchImageOperation the initialization method will retain and keep a reference to the url of the image to download.

Creating circular dependencies can lead to a situation in which the operations are deadlocked since an operation object will not run until all of its dependent operation objects have finished executing. As was noted earlier, a cancelled operation is considered to have finished executing. It is a recommended practice that an operation object’s dependencies be set before it is added to a queue since a dependency added after may not prevent the operation object from running. Operation objects can have priorities that range from the following: NSOperationQueuePriorityVeryHigh 8 NSOperationQueuePriorityHigh 4 NSOperationQueuePriorityNormal 0 NSOperationQueuePriorityLow –4 NSOperationQueuePriorityVeryLow –8 CHAPTER 1: Using Concurrency to Improve the Responsiveness of iPhone and iPad Applications and are set using the setQueuePriority: method.

Note that it is up to the operation object to check to see that it has been cancelled and stop executing (this will be discussed in greater detail in the following section). NSOperation and NSInvocationOperation Operation objects encapsulate the data and the methods that belong to a task. If an application has a time-consuming task that would benefit from being executed in a background thread then there are two approaches to modeling that task, either subclass NSOperation to define a custom operation object or use an instance of NSInvocationOperation.

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