barcode in vb.net 2008 6: Switch View with Multiple Graphics in Objective-C

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CHAPTER 6: Switch View with Multiple Graphics
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// Initialization code - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) { } return self; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation) interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview // Release anything that's not essential, such as cached data if (self.ein1Controller.view.superview == nil) self.ein1Controller = nil; else self.ein1Controller = nil; } - (void)dealloc { [ein2Controller release]; [ein1Controller release]; [super dealloc]; } @end
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This brief overview is sufficient given your level of understanding. Meanwhile it s worth mentioning that, at a recent conference, I heard a husband and wife team, who are making about $50K/month, admit to hundreds of iPhone developers that they barely understand Apple s boilerplate implementation code. The key, as you may be gathering, is that they are clever enough to know where to paste the names of their views! For instance, do you see where I inserted Einstein1View and so forth in the (void)viewDidLoad method Very good! Let s go to Interface Builder and connect everything up. We re almost done!
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Working on the .xib Files
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As indicated by Figure 6 32, go to the Resources folder and open the MainWindow.xib file. As always, this will open Interface Builder.
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CHAPTER 6: Switch View with Multiple Graphics
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Figure 6 32. Go to the Resources folder and open the MainWindow.xib file.
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Once Interface Builder is open, go to your Library window by entering L. Navigate to the Controllers folder in Cocoa Touch and drag a View Controller into your Document window, as shown in Figure 6 33. NOTE: The Document window is the window that holds your documents. It is not the open window of your desktop.
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Figure 6 33. Drag a View Controller (top left icon) into your Document window.
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CHAPTER 6: Switch View with Multiple Graphics
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Select the File s Owner
With the View Controller still activated (if it isn t, click on it once), have a look in the Inspector window and note that, by default, it is associated with a generic UIViewController. We really don t want that, though. We want our View Controller interacting with the code that we programmed for our own creation a character that we have named SwitchViewController. So, click on the drop-down menu and select SwitchViewController, which will be associated with this View Controller in the Document window. Refer to Figure 6 34.
Figure 6 34. Select SwitchViewController to associate it with the View Controller in the Document window.
Drag a View onto the Screen
Scroll down to the Windows, Views & Bars folder in your Library and drag a view onto your screen as shown in Figure 6 35. We are doing this because we need views for the SwitchViews that we are generating. We could make our own buttons to switch between the different views, but we ve already done this. You know how to do that. So, I thought it would be nice to use one of the pre-coded buttons that is in the Windows, Views & Bars folder. Go ahead then and drag a Toolbar onto your screen, and place it at the bottom of the workspace. Refer to Figure 6 36. We now want to give the button on the toolbar a name. Click on it, and call it Switch Views, as demonstrated in Figure 6 37.
CHAPTER 6: Switch View with Multiple Graphics
Figure 6 35. Drag a view onto your screen.
Figure 6 36. Drag a toolbar onto your screen and place it at the bottom of the workspace.
Figure 6 37. Name the button Switch Views.
CHAPTER 6: Switch View with Multiple Graphics
We need to connect the mechanism inside the Switch Views button to the code we have now associated with the SwitchViewController. Control-drag from the Switch Views button downward to the Switch View Controller icon. At this point, your screen should look similar to Figure 6 38.
Figure 6 38. Control-drag from the Switch Views button downwards to the Switch View Controller icon.
Now we want to connect the Switch Views button to the appropriate option. As you drag over the Switch View Controller icon, the Sent Actions black drop-down menu opens, and you can select the switchViews option, as shown in Figure 6 39.
Figure 6 39. Connect the Switch Views button to the switchViews option.
CHAPTER 6: Switch View with Multiple Graphics
What is going on here Remember, back in Step 14, when we created an action that would advertise that we have a switch view It looked like this:
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