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CHAPTER 4: Core iPhone Tools
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Figure 4 5. Adding the UI controls to the Main View window
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Make each control 280 pixels wide and center the text. For the UITextField, make the Placeholder attribute Write message here (the placeholder is text that is shown in a grayedout form in a Text Field as a hint to the user). Make the window background pale gray (set the Brightness value in the Gray Scale Colors panel to 90%). You may be wondering why all of the controls are in the top half of the window. Run the emulator ( R) to see why (Figure 4 6): click in the Text Field and you will see the virtual keyboard come up. Your user interface design should take account of the fact that the keyboard may need to be accommodated on the screen. We ll be looking further at this keyboard shortly. Quit from the emulator ( Q).
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CHAPTER 4: Core iPhone Tools
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Figure 4 6. Testing the user interface in the emulator
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Next you need to wire up the application. Remember in 3 when you connected the button to the controller, and the controller to the source and destination Text Fields That s what needs to happen now. But where is the controller There is no obvious dedicated controller in the Document window. The answer in this case is File s Owner. File s Owner is a special object that represents the object (in this case MainViewController) that owns or loads the user interface. You can confirm this by selecting File s Owner and looking at the Identity panel in the Inspector window. You will see that it is an instance of a MainViewController. So this is the controller we want to make our connections to. This may seem odd, since in a conventional Mac OS X application File s Owner is an instance of NSApplication, but in this simple type of iPhone application File s Owner is an instance of MainViewController (you can confirm this by selecting File s Owner and looking at the Identity panel in the Inspector window you will see that it is an instance of a MainViewController). That s where we want to make our connections. Control-drag from the UIButton to File s Owner. When you drop the line on File s Owner, choose the sayHello: action (see Figure 4 7).
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CHAPTER 4: Core iPhone Tools
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Figure 4 7. Wiring up the user interface
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Similarly, Control-drag from File s Owner to the UITextField and choose sourceTextField as the outlet, then from File s Owner to the UILabel choosing destinationTextField as the outlet. Save and close Interface Builder. Excellent. It looks as though the application is ready to roll. Build and Run. Hmm. The application compiles and runs; however, when you click the text, type, and click the button, nothing happens. What has gone wrong here Quit from the emulator and let s start checking. In Xcode choose the Build Results tab. Ah, there are two warnings (see Figure 4 8):
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Figure 4 8. Warnings from the Show Message application run
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CHAPTER 4: Core iPhone Tools
The two warning messages are about getting and setting the stringValue property. That s where we need to start looking perhaps there are syntax differences between the AppKit and UIKit class methods. A good tip here is to use Xcode s code completion features. If setStringValue is not correct, what should we be using here To use this here, position the cursor immediately before setStringValue and hit Return to put the rest of the text on the next line (we ll get rid of the text that we just shunted out of the way shortly). Now type set (it s a fair bet that the command we re looking for begins with set ) and then hit the Escape key. This pops up a code completion list. Xcode shows all relevant commands for the class (you will see that it is clever enough to know that the method is for a UILabel class). See Figure 4 9.
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