iOS SDK and SQLite: Building Data-Driven Apps
Illustration by Don Barnett

iOS SDK and SQLite: Building Data-Driven Apps

with Bill Weinman

Video: Viewing pages in Safari

Now, we have a working webView and we'd like to be able to pass pages off to Safari as a full-featured mobile web browser. Let's see how we do that. We'll navigate here to Chapter 6 of our exercise files, and we're going to make a working copy of our webView-02. I'm using the -done version. You can use the version that you created if you've been following along with the exercises. I'm going to rename that to -03 and open it up in Xcode by double-clicking on the Xcode project file here in the project folder.
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  1. 8m 29s
    1. Welcome
      57s
    2. Exercise files
      2m 17s
    3. Course overview
      3m 4s
    4. Application overview
      2m 11s
  2. 14m 49s
    1. Prototyping in a testbed
      1m 27s
    2. Building the view controller
      3m 45s
    3. Coding the testbed
      7m 56s
    4. Using the testbed
      1m 41s
  3. 37m 49s
    1. Understanding SQLite in iOS
      1m 41s
    2. Creating an Objective-C interface for SQLite
      9m 57s
    3. Testing the BWDB interface in the sandbox
      7m 1s
    4. Designing a database schema
      8m 7s
    5. Supporting the application with a specific interface
      7m 7s
    6. Using C pointers with automatic reference counting (ARC)
      3m 56s
  4. 21m 18s
    1. Understanding the table view
      1m 33s
    2. Creating the view controller
      6m 39s
    3. Reading from the database
      13m 6s
  5. 33m 50s
    1. Understanding the parsing process
      1m 57s
    2. Creating the item view controller
      12m 25s
    3. Reading data from the internet
      5m 30s
    4. Parsing the feed with NSXMLParser
      8m 2s
    5. Updating the item view with the feed items
      5m 56s
  6. 40m 14s
    1. Understanding the modal view
      1m 47s
    2. Constructing the view controller
      15m 5s
    3. Finding a feed link in a web page
      8m 55s
    4. Parsing the feed with NSXMLParser
      5m 4s
    5. Delegating back to the parent view
      6m 11s
    6. Deleting feeds
      3m 12s
  7. 21m 5s
    1. Creating the web view class
      12m 33s
    2. Coding the web view
      5m 25s
    3. Viewing pages in Safari
      3m 7s
  8. 14m 3s
    1. Understanding the iOS preferences system
      1m 23s
    2. Creating the preferences plist in Xcode
      7m 20s
    3. Reading preferences in your application
      5m 20s
  9. 6m 15s
    1. Adding pull-to-refresh functionality
      2m 34s
    2. Implementing the pull-to-refresh gesture for iOS 6
      3m 41s
  10. 27m 1s
    1. Understanding split view
      1m 4s
    2. Coding the table views
      11m 24s
    3. Implementing the iPad detail view
      6m 35s
    4. Implementing the iPad modal view
      7m 58s
  11. 35s
    1. Goodbye
      35s

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Watch the Online Video Course iOS SDK and SQLite: Building Data-Driven Apps
3h 45m Intermediate Jan 16, 2013

Viewers: in countries Watching now:

The iOS software development kit (SDK) includes the popular SQLite library, a lightweight yet powerful relational database engine that is easily embedded into an application. In this course, Bill Weinman teaches you how to build an RSS reader for iOS devices, integrating XML data and a streamlined interface. He explains how to use the SQLite database, display information in a table view, code view controllers, and create a preferences pane for your app. The resulting application is optimized for all iPhone and iPad displays.

Topics include:
  • Prototyping the app
  • Coding and working with a testbed
  • Creating an Objective-C interface for SQLite
  • Designing a database schema
  • Creating the view controllers
  • Reading and writing to the database
  • Parsing the RSS feed with NSXMLParser
  • Updating the item view with feed items
  • Implementing the pull to refresh gesture for iOS 6
  • Creating a universal application with multiple views
Subject:
Developer
Software:
iOS
Author:
Bill Weinman

Viewing pages in Safari

Now, we have a working webView and we'd like to be able to pass pages off to Safari as a full-featured mobile web browser. Let's see how we do that. We'll navigate here to Chapter 6 of our exercise files, and we're going to make a working copy of our webView-02. I'm using the -done version. You can use the version that you created if you've been following along with the exercises. I'm going to rename that to -03 and open it up in Xcode by double-clicking on the Xcode project file here in the project folder.

So, I'm going to minimize that and come back up here to our actionButton method. And this our actionButton that gets called whenever we press that button. It has an NSLog right now. So, if I run this in the iPhone Simulator, and I'll bring up a page here, and you'll notice when I press this button, instead of launching Safari, it just displays this log message that says the URL that's been called.

And so I'll come back here in Xcode. I'm going to press Command+. to stop the simulator. I'm going to minimize that down there, and we're just going to replace this line with the line of code that will actually call Safari. And that looks like this. It's a method call on an object. So, I'm going to type in UIApplication.sharedApplication and openURL. And for the URL itself, I'm going to call self.webView.request.URL.

And so the webView itself keeps a copy of the URL for the current request that is being displayed. And so that gives us the URL. This openURL method is called on UIApplication.sharedApplication. So, UIApplication is a centralized point of control for all iOS applications. It provides access to system resources. sharedApplication is a property that gives the application instance, the individual application that you are using. So, you call methods on the sharedApplication property within UIApplication.

openURL is the system entry point for opening a URL resource with the associated application. Our HTTP or HTTPS applications will open in Safari. So, let's go ahead and run this in the Simulator, pressing Command+S to save and clicking on the run button here. And now, when I bring this web page up and I press this button here, it will load up Safari with that URL.

So now, we have a complete working webView. It's really a very simple task. Cocoa Touch provides a simple delegate-based webView that's powerful, flexible, and easy to implement, and it works very well.

Find answers to the most frequently asked questions about iOS SDK and SQLite: Building Data-Driven Apps .


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Q: Why is the RSSDB library in the exercise files different than the one in the videos?

A: The RSSDB library had to be updated to work around a bug in the iOS 7 SDK.

There is a bug in the iOS 7 SDK that prevents the BWDB fast enumeration implementation from working on a device. The symptom is code that runs fine on the emulator, but not on a device. iOS devices use an ARM processor, while the emulator runs on your Mac's Intel processor. This points to the LLVM ARM code generator as the source of the bug. Because the bug appears to be in the LLVM compiler, it may be some time before it is fixed.

As a workaround we have changed the getFeedIDs and getItemIDs methods in the RSSDB library so they don't use Objective C fast enumeration. 

Please note that this same bug also affects some of the BWDB testbed code in Chapter 2. The result is that it will run on the emulator but not on a device.

Q: After upgrading to Xcode 5.1 I get an error that says:

"Used type va_list (aka_builtin_va_list) where arithmetic or pointer type is required"

A: Please download the exercise files again to get the latest version of the BWDB library.
 
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