Beginning iOS Cloud and Database Development by Nathan Ooley

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By Nathan Ooley

Beginning iOS Cloud and Database Development will get you began with construction apps that use Apple's iCloud. you will examine the strategies with the intention to allow you to devise and create iOS apps which may have interaction with iCloud servers. From the fundamentals up, you are going to steadily how you can configure your app for iCloud, add and obtain records, enforce revisions, upload clash solution guidelines, and paintings with customized files.

There's extra! you will find out how to combine iCloud with middle facts established functions. in addition to technical recommendation, you will discover feedback and most sensible practices to layout the interplay of iCloud-driven functions.

According to many resources, analysts, and exhibits, Apple will depend progressively more on iCloud or internet apps within the cloud to shop and flow data-intensive media and other forms of apps. because the majority of apps use a few kind of data—and that purely will develop as apps turn into extra advanced with wealthy and streaming media—this booklet indicates builders tips on how to create apps for iCloud, Apple's new cloud computing garage and knowledge service.

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The third parameter provided is the name of the message we are listening for. And the final parameter is the object sender that we provide our iCloud Key-Value Store object. Now we need to add the method storeDidChange:, which will really be the meat of our logic. This is where you can test for conflicts and do any other logic to keep your user defaults and the iCloud Key-Value Store in sync. Let’s add that method now. CHAPTER 4: Basic Setup of iCloud and Key-Value Storage 53 - (void)storeDidChange:(NSNotification *)notification { // Get the list of keys that did change NSDictionary *userInfo = [notification userInfo]; NSNumber *reasongForChange = [userInfo objectForKey:NSUbiquitousKeyValueStoreChangeReasonKey]; NSInteger reason = -1; If a reason could not be determined, we shouldn’t update anything.

We are almost done, but we haven’t handled the Bar Button Item that we will use to leave the view. To handle the Close button press, we will add two methods. The first method simply calls our updateDefaultTextField: method on each of our text fields to handle our saving of the data. We call this method updateAllTextFields. -(void)updateAllDefaults { [self updateDefaultForTextField:_txtDisplayName]; [self updateDefaultForTextField:_txtFavoriteNumber]; } Now we add a method called btnClose: that calls our updateAllDefaults method and also dismisses our view controller, which returns us to our MainViewController.

This means that if you need to ensure that all the values you want to save are actually saved, you can package them in a dictionary. If any of the values inside the dictionary fail to save, none of the values will be saved. iCloud automatically handles conflicts by delivering you the most up-to-date value for any keys based on timestamp. For this reason, it is recommended that you use NSUserDefaults in concert with iCloud Key-Value Store. This allows you to resolve any conflicts that could arise from situations where one device may update a value before it receives the previously updated value.

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