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Additional resources for iOS 7 Development Recipes: A Problem-Solution Approach

Example text

Like all things boring, you’re better off dealing with them straight away. One thing you can do to make the effort easier is to create a default error handler—a single piece of code that can handle most of your errors. This recipe shows you how to set up a simple error handler that, based on the error object you provide, alerts the user and even provides recovery options for the user when available. Setting Up a Framework for Error Handling By convention in iOS, fatal, non-recoverable errors are implemented using exceptions.

M and implement the initWithError: method, as shown in Listing 1-19. Listing 1-19. fatalError = fatalError; } return self; } Finally, implement the clickedButtonAtIndex: delegate method so as to abort in case of a fatal error. As you can see from the code that follows, you also release the delegate by removing it from the retainedDelegates array, as shown in Listing 1-20. CHAPTER 1: Application Recipes 37 Listing 1-20. fatalError) { // In case of a fatal error, abort execution abort(); } // Job is finished, release this delegate [retainedDelegates removeObject:self]; } If you rerun the app now and tap the “Fake a Fatal Error” button, the app will abort execution right after you’ve dismissed the error message if you tap the “Shut Down” button (see Figure 1-36).

These have been edited out, as have the elements in the status bar. Even though there is support for language-specific versions of the launch images, it’s suggested you don’t use it due to the increased amount of space the additional launch images will require. Launch Image Files Depending on the nature of your app and which devices it supports, you’ll need to create one or more launch images. Including a launch image in your app is just a matter of adding it to the project. In the past, simple naming conventions told iOS how to categorize images and their appropriate sizes depending on which device is used.

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