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The code to update the UITextField s text is straightforward. You append the text string. In the case of these methods, you insert a corresponding emoticon face based on which button the user pressed. Although this example is trivial, there are many uses for having a view on top of the keyboard. A more interesting example might display a list of words that autocomplete what the user is currently typing. You could write a system that tries to predict what the user is typing and creates buttons on the toolbar from the top five results. When the user tapped the button, it would complete the word with the word the user tapped. This would greatly improve the speed of text input on the device.

Now that you ve created the UITextField subclass with a custom accessory view, you need to use it in the code. Just as with any other view, you can use two approaches for implementation. You can either initialize the custom text field programmatically, adding it as a subview, or you can implement it using Interface Builder. We ll discuss the latter.

This method starts by checking the deleting flag. If the deleting flag is not true, then, first, the selectedMessage variable is updated with the Message corresponding to the row selected. Second, the showSeletedMessage( ) method is called to display the message that has just been selected. Finally, updateButtons( ) is called to update the state of the buttons.

Start by opening a .xib file that you wish to contain your custom UITextField. In this case, you ll use CustomAccessoryViewViewController.xib. This will open Interface Builder. Because the view is just a subclass of a UITextField, you can drag a standard UITextField onto the view. To set it as a MyCustomAccessoryTextField, you must select it and open the Identity Inspector from the Tools menu. When the inspector is open, select MyCustomAccessoryTextField from the Class drop-down menu, as shown in figure 19.3. When you have completed this step, run the project. Tap inside your UITextField, and the keyboard will animate up along with your custom UIToolbar of emoticons. Next, you ll see how to modify this code slightly so that the keyboard is completely replaced by the UIToolbar of emoticons.

http://developer.apple.com/documentation/Cocoa/Conceptual/ CocoaFundamentals/CocoaObjects/CocoaObjects.html#//apple_ref/doc/uid /TP40002974-CH4-SW32

Each of the actionNew( ), actionForward( ), and actionReply( ) methods serves to invoke the sendMessage( ) method when its respective button is clicked. The sendMessage( ) method is passed an identifier specifying the type of message being sent and the selectedMessage if applicable.

Replacing the default keyboard on the device is something developers have requested for quite some time. Many hacky solutions existed, but as of iPhone OS 3.2, it couldn t be easier. You ve already seen how to implement a custom input accessory by returning a UIView from UITextView s inputAccessoryView method. Creating a custom keyboard isn t much different. Instead of overwriting inputAccessoryView, you must overwrite

the inputView method of UITextField. Listing 19.2 shows how you can replace the iPhone s default keyboard within the application with the UIToolbar of emoticons.

As E-mail Client is currently written, it does not automatically remove messages from the server. Instead, you must explicitly request that they be deleted. This is a safety feature built into the program that allows you to experiment freely without worrying about losing an important message. If you don t explicitly delete a message, it will remain on the server where it can be retrieved by another e-mail application. The actionDelete( ) method shown in this section deletes an e-mail message from the server. It works by flagging the selected message as being deleted and then instructing the selected message s folder to expunge any deleted messages it contains. In general, messages can be removed from JavaMail folders by calling the expunge( ) method of the Folder object or by closing the folder with the expunge flag set to true. JavaMail defines several message flags which are supported by the javax.mail.Flags class and specified by its inner class, javax.mail.Flags.Flag. Of these flags, DELETED is the one that marks a message as deleted. Because JavaMail s built-in POP3 code does not support the Folder object s expunge( ) method, the actionDelete( ) method removes the deleted message by closing the folder with the expunge flag set to true.