how to print barcode in vb.net 2008 D Updating current applications for the iPad in Objective-C

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appendix D Updating current applications for the iPad
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Developing for the iPad is nearly identical as developing for the iPhone, so you should almost always release a version of your application for both. iPad users can always run your iPhone application in 2x mode (which stretches your iPhone application to fit the dimensions of the iPad screen), but this makes for an overall poor experience. In a development document titled iPad Programming Guide, Apple provides a clear and concise method for porting your application from the iPhone to the iPad. Rather than restating that document, we felt it would be more beneficial to walk you through each step in converting an actual application. You ll follow a few standard steps to convert iPhone applications into iPad applications: Configure Xcode. Create two separate build targets: one for iPhone and one for iPad. 2 Update the Info.plist, which is needed to support multiple interface orientations. 3 Add iPad-specific interface components. 4 Update the views. Because the device is larger, you need to update the frames of all your views. 5 Add multiple-orientation support. In this appendix, you ll convert the collage application that you created in chapter 11 to an iPad application.
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Configuring Xcode
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The process for updating your build target to include iPad support is simple. This is because the latest version of Xcode includes a tool that performs the migration for you. Apple strongly recommends against manually updating your files to support the iPad. Follow these steps:
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Open the collage project in Xcode. Right-click your collage target, and select Upgrade Current Target for iPad (see figure D.1).
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Updating Info.plist to support multiple orientations
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Select Two Device-Specific Applications from the next screen. You may choose to have one universal binary build, but it s usually a little more challenging to maintain and has a few more gotchas. For this tutorial, you ll build two separate applications.
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As soon as you perform the upgrade, you ll notice that a Resource-iPad folder is added to your project. It contains a new MainWindow-iPad.xib file for the main window of your application. If you attempt to build and run the application for the iPad now, it will fail because you haven t updated your Info.plist.
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Figure D.1 Upgrading your build target for the iPad
Updating Info.plist to support multiple orientations
As we mentioned in chapter 7, all iPad applications are required to support all interface orientations. In order to do this, you must add the UISupportedInterfaceOrientations key to your project s Info.plist. The steps to do this are as follows.
Open the Info.plist file, right-click in the plist window, and select Add Row. In the Key column, type UISupportedInterfaceOrientations~ipad. The ~ipad after the field denotes that this field applies to the iPad only. You can just as easily add ~iphone or ~ipod to apply the field to the other devices. Right-click the field and set the value type to Array. Right-click again, add a row, and add each of the three interface types. Figure D.2 shows what the plist should look like when you re finished.
You can now build the application and run it in the iPad Simulator. Because you have multiple targets, you must specify which target to run. Set the active build target to collage-iPad by clicking the Overview drop-down menu on the Xcode toolbar and selecting it as shown in figure D.3. You should also set the Active SDK to iPhone Simulator 3.2. Your application should now run in the iPad Simulator (see figure D.4). Notice that most of the interface is resized for you. This is because you have a simple
Figure D.2 Info.plist to support multiple interface orientations
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APPENDIX D
Updating current applications for the iPad
interface composed of native UI elements. More complicated interfaces require more updates, similar to those in figures D.3 and D.4. If you tap the arrow in the lowerleft corner of the screen to add images, the application crashes. An error displays on the console, reading UIImagePickerController must be presented via UIPopoverController ; this is because the iPad displays the UIImagePickerController differently than the iPhone. You ll now make the necessary change to correctly display the picker.
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