Understanding split view
Video: Understanding split viewWhen the iPad was first introduced, a number of people made comparisons to a giant iPhone that couldn't make telephone calls. The reality turned out to be something quite a bit more brilliant. And as a result, well, the iPad has become very popular, selling many millions of units in these first few years. The beauty of the iPad interface is in its large screen area. The SplitViewController is an excellent example of this. It combines two views, the master view, often a table view and the display view, in this case a webView.
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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.
- 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
Understanding split view
When the iPad was first introduced, a number of people made comparisons to a giant iPhone that couldn't make telephone calls. The reality turned out to be something quite a bit more brilliant. And as a result, well, the iPad has become very popular, selling many millions of units in these first few years. The beauty of the iPad interface is in its large screen area. The SplitViewController is an excellent example of this. It combines two views, the master view, often a table view and the display view, in this case a webView.
In landscape mode the master view is usually on the left side occupying roughly a third of the screen, and the display view is on the right using the remainder of the screen. In Portrait mode the display view may command the entire screen and the master view is accessed with a pop-up controller. This is all accomplished with a programming interface that's consistent with the rest of the Cocoa Framework, making it very easy to implement, especially if you have experience writing iPhone or Cocoa Applications or even another event driven architecture.
Find answers to the most frequently asked questions about iOS SDK and SQLite: Building Data-Driven Apps (2013) .
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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.
- Q: I'm using Xcode 6. Why am I getting error messages with the exercise files?
- A: A lot has changed in iOS since this course was released. The author is in the process of rewriting the code and updating the course for iOS 8. In the meantime he has prepared a version of the app that works in iOS 8 and Xcode 6. Download it here:http://ios.bw.org/
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