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Coding with IBOutlets
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Heading back into Xcode, you only need to input a few lines of new code to get the web view working, as follows:
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- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [self refreshQuote]; [NSTimer scheduledTimerWithTimeInterval:5 target:self
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Using Interface Builder
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selector:@selector(refreshQuote) userInfo:nil repeats:YES]; [window makeKeyAndVisible]; return YES; } - (void) refreshQuote { NSURL *requestURL = [NSURL URLWithString:@"http://quoteweb.aol.com/ syms=AAPL&e=NAS&action=hq&dur=1&type=mountain&hgl=1&v gl=1&vol=1&splits=1&div=0&w=280&h=391&gran=d"]; [myWebView loadRequest:[NSURLRequest requestWithURL:requestURL]]; }
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Note how you call the refreshQuote method. It s called using an NSTimer. This allows you to automatically call the refreshQuote method every so often in this case, every 5 seconds. Note that you don t have to allocate the web view, nor do you have to initialize it, nor do you have to add it as a subview of your window; all those details are taken care of by Interface Builder. But after you link to the object via an outlet, you can access it like any object you created yourself. As we promised earlier, we ll take a more complete look at how web views work in chapter 14. But we wanted to include them here to demonstrate (again) how easy it is to incorporate an unfamiliar object into your code using Interface Builder. In addition, a web view provides a nice example of client-server integration between web design and the SDK a topic that we first touched on in chapter 2 and that turns out to be pretty simple to attain using the iPhone OS. By linking to a URL that sends dynamic content to your device, you can make a sophisticated, always-up-to-date program despite only designing the display engine on the SDK side of things. Figure 4.10 shows what the final product looks like. That brings us to the end of the Apple stock example. It presented some fundamental uses of Interface Builder that you ll encounter again and again. In particular, creating objects in Interface Builder and then hooking them up to Xcode will likely become a regular part of your SDK coding Figure 4.9 An image, a label, and a dynamic web view are put experience, so you should make sure you re entirely together in Interface Builder with familiar with that process. only a single line of Xcode Now that you ve seen some examples of how to required (plus a couple of work with Interface Builder, we ll touch on some addi- declarations). This shows how simple it is to build a tional functionality that will become more important sophisticated interface with little work by using Interface Builder. in the chapters to come.
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When we finished our look at Xcode in chapter 3, we had a few slightly more advanced topics that we wanted to talk about: foundational stuff that nonetheless lay beyond the bounds of our first simple program. The same is true with Interface Builder. Now, we ll explore other types of connections beyond IBOutlets, how to create external objects, how to initialize Interface Builder objects, and how to work with .xib files.
Building other connections
As we ve noted, IBOutlets are only one of a few major types of connections that you can build into Interface Builder. You ve also seen delegate connections, which allow you to tie one object to another for purposes of delegation. You do this without ever setting the delegate property in Xcode: you link one object to the other in Interface Builder. The third major type of connection is the IBAction, which creates a connection that causes a method in your class file to be run whenever an action is sent to a UIControl. Building IBAction connections is almost exactly like building IBOutlet connections: you create a method declaration in the appropriate header file that uses IBAction as its return, and then you connect it to an appropriate action in Interface Builder; each object comes with all of the potential actions built in. Finally, in Xcode, you write the method that specifies what happens when the control is modified. We ll get into this in more depth in chapter 6.
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