how to print barcode in vb.net 2008 Building connections in Interface Builder in Objective-C

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Building connections in Interface Builder
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As we ve already discussed, an IBOutlet gives you the ability to access an Interface Builder created object from within Xcode. This is critical when you want to reset properties in Xcode or when you want to set a property that s not available from within Interface Builder, as is the case with the web view s URL. Creating this connection is a three-step process, as outlined in table 4.1. We ll now look at each of these steps in more depth.
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Using Interface Builder
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Table 4.1 You can link together an Interface Builder object with an instance variable in Xcode through a few simple steps. Step 1. Declare your variable. Description In Xcode, add an IBOutlet variable to the header file of the appropriate object. Save your Xcode files. In Interface Builder, drag a connection from your Interface Builder object to the appropriate Xcode top-level object, which should highlight. Select the appropriate variable name from the pop-up listing. You can now access your Interface Builder object from Xcode, as if it were created there.
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2. Connect your object.
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3. Code!
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Declaring an IBOutlet
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You met IBOutlets in the previous chapter. They re declared like normal instance variables in your header file, but you precede them with the IBOutlet statement to show that the object was created in Interface Builder. For the example web-view object, that means you need to update the header file of your app delegate class as shown here:
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@interface webimageAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; IBOutlet UIWebView *myWebView; } @property (nonatomic, retain) IBOutlet UIWindow *window; - (void) refreshQuote; @end
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You ve now finished the first step of connection building.
Connecting an object
At this point, you can build the physical connection from your object in Interface Builder to the IBOutlet in your Xcode. You start this process by bringing up the Connections tab for the object you want to connect: in this case, a web view. To access the Connections tab, choose Tools > Connections Inspector or click the second tab in the inspector window. Each web view built in Interface Builder comes with five potential connections built in. You can automatically define your web view s delegate in Interface Builder by creating a connection. You can also connect up a few actions a topic we ll return to shortly. For now, you want to connect the object to Xcode. You do that by clicking the New Referencing Outlet circle in the object and then dragging a line to the top-level object that holds your new IBOutlet statement. In this case, you drag a connection from the web view to the app-delegate proxy. If the toplevel object has IBOutlets that are waiting to accept connections, it s highlighted as shown in figure 4.8.
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Building connections in Interface Builder
You need to drag and release to build a connection in Interface Builder.
When you mouse over to the correct top-level object, release the mouse button. A menu pops up that lists all the available IBOutlets in that file. When you do this, you see the myWebView IBOutlet that you just built. Select the outlet, click the mouse, and your object and your IBOutlet are connected. At this point, you ve finished building a bridge between Interface Builder and Xcode. If you look at the Connections tab of the app delegate proxy, you ll see that it acts as a referencing outlet for the web view. If you want to look at both Connections tabs at the same time, you can do so by Ctrlclicking each of the two objects to bring up standalone Connections panels, as shown in figure 4.9. Through these Connections panels, you can see not only the reciprocal web view connection that you just built but also the app delegate s existing connections: it acts as a delegate for the application (which is the .xib file s owner), and it acts as an outlet (which you already used) for a window. Now, all you need to do is fall back on your existing Xcoding skills to make the web Figure 4.9 You can Ctrl-click to access Connections panels if you want to see multiple view do what you want. connections at the same time.
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