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The second tab in the inspector window is the Connections tab. It shows an object s IBOutlets and IBActions. The example label doesn t have any IBOutlets, which means it can t be accessed from Xcode. But this is fine; we re happy with how the label is set up in Interface Builder, and you won t need to adjust it during runtime for this example. We ll look at the Connections tab in depth in the next section.

// Update crawling stats. updateStats(url, crawledList.size(), toCrawlList.size(), maxUrls); }

This chapter will cover the main principles of threading. We will develop a neat little iPhone application that demonstrates all these principles. Additionally, we will consider common pitfalls associated with threading and how to avoid them.

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You can use the Size tab to adjust the size and position of an object. Figure 4.5 shows the options you can change here. This tab leads off with values for size and position. Not only can you change an object s starting point, but you can also define where that starting point is, relative to the object, using the grid at the upper left. Width and height are available here too. The Autosizing box controls how your object resizes its subviews when it resizes. For now, leave it be; it ll be of more importance when we talk about basic view controllers in chapter 5. The Alignment section allows you to make multiple objects line up along an edge. Although you won t use them for the label, this is a frequent desire in layout. To make this work, you select all the objects you want to align (by Shiftclicking) and then choose the appropriate box in the Alignment section. Finally, the Placement section lets you align your current object relative to its parent. This works like the crosshairs you saw when you initially created your objects. If you click both placement buttons, your label will move to the center Figure 4.5 You can change an object s of the screen. position and size from the Size tab.

The first call to updateStats( ), earlier in this method, updates the label that indicates which URL is being crawled. This second call updates all the other values because they will have changed since the first call.

The final panel in the inspector window is the Identity tab. Like the Connections tab, it s of little use for this label, but we cover its functionality for the sake of completeness. Figure 4.6 shows what it looks like. For simple Interface Builder objects (like this example label), you use only the Interface Builder Identity section at the bottom of the Identity tab. This lets you name your object, which makes it easier to see what you re accessing in Interface Builder. It s strictly for your own use. In this case, you named the label Hello Label. The other three sections of the Identity tab are for more advanced purposes, and we ll give them more attention later in this chapter. You use Class Identity if you want to link in an external object. You ll do this, for example, when you subclass a view controller and then want to make a link to that new controller in Interface Builder. The Class Actions and Class Outlets sections show IBAction and IBOutlet declarations that you ve made in your object s header file. For example, the app delegate object has a window IBOutlet Figure 4.2 The Identity tab contains (which you ve seen several times), and your web- some deeper stuff that s mostly view object has a few system-defined actions. These beyond the needs of this simple example program. are the things to which you can build connections. For now, leave them be. They re not required for the label. But you have two more objects to work with in Interface Builder: the image view and the web view.

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