Decoding the iOS6 SDK

Decoding the iOS6 SDK

Mark Harmonds

Language: English

Pages: 360

ISBN: 2:00151179

Format: PDF / Kindle (mobi) / ePub

Decoding the iOS 6 SDK is written for intermediate iOS developers who want to quickly get up to speed with the iOS 6 SDK and all the fundamental changes that occurred to Xcode and the iOS device landscape in 2012.

Beginning iOS developers who understand the fundamentals of the SDK and Xcode will also benefit from reading this work.

The book follows a non-linear format that allows the reader to decide how much time to spend on any given topic. This is accomplished by dividing each chapter into a “Theoretical Overview” section and a “Tutorial Project” section.

While it’s certainly possible to read the entire book from cover-to-cover (we think you’ll enjoy doing so!), it’s also possible to simply read the “Theoretical Overview” of each chapter to get a high- level understanding of the iOS 6 SDK changes, and then go back and focus in on the most relevant or interesting tutorial projects on a more selective basis.

Regardless of how you approach the book, expect to learn about the most essential aspects of developing with the iOS 6 SDK, Xcode, and all the iOS devices released from Cupertino in 2012.

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BirdSightingDataController (which controls our data—don't mistake it for a view controller!) where we implemented saving the model data (our array of BirdSighting objects) and loading it, and also the code in AppDelegate where the saving and loading is triggered. This also explains why if we delete the preserved data of the app (by killing it from the task bar) the data in the table won't be impacted. It's stored in the Documents folder of the app and is under the developer's control, not the OS.

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constraint on the actual button size. The previous set of constraints could be satisfied by buttons of sizes, say, 50 × 40 pixels or of sizes 70 × 50 pixels, giving two different layouts. Observe also that the same UI might be specified by a totally different set of constraints. For example, instead of explicitly specifying the width of a button, we might specify a fixed amount of spacing between the buttons or between the buttons and the superview, effectively forcing Auto Layout to compute the

the media item and pass it the key that corresponds with the information we need. Take a look at the implementation below to see how this works in practice. RPMusicLibraryViewController.m - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell Identifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (!cell) { cell = [[UITableViewCell alloc]

view), the layout needs to be invalidated and updated. This is done by overriding shouldInvalidateLayoutForBoundsChange: like so. RPFlowLayout.m - (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds { return YES; } Build and run the application once more to see the final result. Wrap Up Even though we covered a lot of interesting aspects of UICollectionView, there is much more to explore. The chapters about UICollectionView should give you a good understanding of how

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