Du kanske gillar. Applied Cryptography Bruce Schneier Inbunden. Earth Stephen Marshak Mixed media product. Tim Roadley introduces new patterns and best practices designed to overcome the frustrations of Core Data development. One step at a time, youll build and extend your skills--even mastering advanced techniques such as complex model migration, deep copy, background processing, and integration with Dropbox, StackMob, and iCloud.
I have read a number of books on Core Data and frankly found most of them to be of not much substance. The fact that it covers covers Core Data with Swift is exceptional in my mind. Despite the book being centered on iOS, I was not disappointed by it as a very large portion of the book can be directly applied to OS X applications. The Core Data Helper routines used in the book and available for download can be real time savers for developers using Core Data.
I intend to use them in an OS X application that I am working on now. Just bought this book and I tried to go through the exercises.
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With all due respect to the author, I do believe these exercises worked amazingly at one time. Looks like Apple has upgraded and moved on from some of the mechanisms Mr. Roadley uses. It is a shame because looks like a lot of good work was put into making the book. But due to the fact that it looks like text is showing its age I can only give it 3 stars. This book was what finally got me from just using Core Data and not really knowing what was going on to actually understanding Core Data. The stuff on NSFetchedResultsController in particular is great and there's a lot of good code to subclass off of in here.
Learning Core Data for IOS: A Hands-On Guide to Building Core Data Applications
Highly recommended. Ir a Amazon. Volver arriba. Finally, select the bar button item and change its system item to Add. Every time you tap the Add button, an alert controller containing a text field will appear. In the canvas, Ctrl-drag from the table view to the yellow view controller icon above the navigation bar, as shown below, and click on dataSource :. Open the assistant editor by pressing Command-Option-Enter or by selecting the middle button on the Editor toolset on the Xcode bar. Ctrl-drag from the table view onto ViewController. Next, name the new IBOutlet property tableView , resulting in the following line:.
Next, Ctrl-drag from the Add button into ViewController.
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Add the following property to ViewController. Next, replace the implementation of viewDidLoad with the following:. This will set a title on the navigation bar and register the UITableViewCell class with the table view. Next, still in ViewController. First you return the number of rows in the table as the number of items in your names array.
Next, you need a way to add new names so the table view can display them. Save inserts the text fields current text into the names array then reloads the table view. Since the names array is the model backing the table view, whatever you type into the text field will appear in the table view. Finally, build and run your app for the first time. Next, tap the Add button.
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The alert controller will look like this:. Your table view will display the data and your array will store the names, but the big thing missing here is persistence. The array is in memory but if you force quit the app or reboot your device, your hit list will be wiped out. Core Data provides persistence, meaning it can store data in a more durable state so it can outlive an app re-launch or a device reboot.
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This will take you back to the familiar app grid on the home screen:. From the home screen, tap the HitList icon to bring the app back to the foreground.
The names are still on the screen. What happened? When you tap the Home button, the app currently in the foreground goes to the background. When this happens, the operating system flash-freezes everything currently in memory, including the strings in the names array.
Learning Core Data for IOS: A Hands-On Guide to Building Core Data Applications by Tim Roadley
Apple introduced these advances in multitasking back in iOS 4. They create a seamless experience for iOS users but add a wrinkle to the definition of persistence for iOS developers. Are the names really persisted?
No, not really. If you had completely killed the app in the fast app switcher or turned off your phone, those names would be gone.
You can verify this as well. With the app in the foreground, enter the fast app switcher. From here, flick the HitList app snapshot upwards to terminate the app. After you remove the app from the app switcher, there should be no trace of HitList in living memory no pun intended. Verify the names are gone by returning to the home screen and tapping on the HitList icon to trigger a fresh launch.
All that matters is the names are still there when the app comes back!