zebra barcode printer in vb.net Figure 4 9. Code completion options in Objective-C

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Figure 4 9. Code completion options
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Scroll through the options in this list and you will see that sure enough there is no setStringValue. However, there is a setText. This looks right, so double-click on it. This updates the code to look like Figure 4 10.
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Figure 4 10. Using Xcode s method signature cues in the editor
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Xcode also puts in the next part of the method signature for you as a cue, so just press the Tab key and you can continue typing. The NSString that needs to go here is the string value of the UITextField, so it will be something like [sourceTextField getText]. (Long-time Java programmers will probably try this first.) However, if you start typing
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CHAPTER 4: Core iPhone Tools
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sourceTextField get and then hit the Escape key, you will see that it pops up the message No completions found. That s obviously not what we need. Delete back over the get and hit Escape again; this time there s a long list to track, but you will see that the most likely candidate for completion is simply text . That must be it (and of course it is, in fact, Objective-C s syntax for handling accessors and mutators). This gives us the right syntax, so all that remains is to close the line correctly and delete the code debris from the next line; the method should now look like Listing 4 6.
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Listing 4 6. The Method with the (Hopefully) Correct Syntax - (IBAction)sayHello:(id)sender { [destinationTextField setText:[sourceTextField text]]; }
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USING DOT NOTATION
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There is an alternative to the standard notation for methods like this. In place of
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[destinationTextField setText:[sourceTextField text]];
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you could equally correctly use dot notation:
destinationTextField.text = sourceTextField.text;
Programmers who are used to Java or C# may find this more familiar, though die-hard Objective-C developers apparently don t like this approach so much. I will be using dot notation more during the remainder of the book. The application is complete. Let s give it a spin. Save everything and then Build and Run. Up comes the iPhone emulator and the program will start. Try typing some text in the box. Notice that the emulator will do predictive text just like a real iPhone. Also, as shown in Figure 4 11, the keyboard and edit controls work in the expected way. Well, not quite, actually. It s just as well you left room for the onscreen keyboard, because there doesn t seem to be a way to get rid of it! The behavior an iPhone user would expect to see here is that tapping Return should dismiss the keyboard. Let s fix that now. If you are in the emulator, quit and go back to Xcode. Open MainViewController.h. You are going to create a new method. Within the user interface whatever control is currently receiving messages is called First Responder. When you are typing in text using the keyboard the First Responder is the Text Field where the text appears. What we want to do here is to detect the Did End On Exit event that is triggered by the Return key. When that event is detected we want the Text Field to stop being First Responder (called resigning). That, in turn, causes the keyboard to be dismissed. Declare a new method called textFieldFinishedWithKeyboard (add the bold code in Listing 4 7).
CHAPTER 4: Core iPhone Tools
Figure 4 11. The Show Message application running and editing text Listing 4 7. Declaring the New Method in MainViewController.h #import "FlipsideViewController.h" @interface MainViewController : UIViewController <FlipsideViewControllerDelegate> { IBOutlet UILabel *destinationTextField; IBOutlet UITextField *sourceTextField; } - (IBAction)showInfo; - (IBAction)sayHello:(id)sender; - (IBAction)textFieldFinishedWithKeyboard:(id)sender; @end
The implementation is simple. In MainViewController.m put the method implementation immediately after the sayHello method (see the bold code in Listing 4 8).
Listing 4 8. Implementing the New Method - (IBAction)sayHello:(id)sender { [destinationTextField setText:[sourceTextField text]]; } - (IBAction)textFieldFinishedWithKeyboard:(id)sender { [sender resignFirstResponder]; } [...]
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