Prior to, and since posting this question almost 2 weeks ago I have searched high and low for a method to make the keyboard click sound work in my app. I have attempted to implement and understand Apple's documentation on custom input views. I butchered my app in many ways attempting to make it work and created several test projects. I tried to interpret how to do this from various other sources on the web. All to no avail. I have finished my app all but for this last function.
I finally hit on a simple answer towards the end of this IPhone Dev SDK form question/post. The ultimate answer is easy and can be done in a few seconds with these easy steps.
Link the 'AudioToolbox.framework' to your project (Click on your project's Target, select 'Build Phases' and under the 'Link Binary with Libraries' item click the + button and add the framework.
Add the following to the header file of the class where you want to implement the click:
#import <AudioToolbox/AudioToolbox.h>
Add the following line of code in the implementation file of your class wherever you want the keyboard click sound to appear:
AudioServicesPlaySystemSound(0x450);
THAT'S IT! AND IT WORKED!!! HALLELUJAH!
According to Paul in the other forum this has the following downside:
"keyboard keys won't be affected by the iOS user preference for keyboard sound on/off."
But when I turn the volume up or down on my iPhone or if I mute the iPhone, the keyboard click sounds do go up and down or are muted as would be expected. Given that I found it impossible to implement keyboard clicks "UIInputViewAudioFeedback" as documented, I'm happy to have anything work.
P.S. If anyone has a link to an actual project that I can download, build and run on my iPhone to see EXACTLY how to properly implement: "UIInputViewAudioFeedback" I'd be happy to give it a look. But so far I've found none, nor any step-by-step newbie style instructions on how to make it work.
[Sept 30, 2012 UPDATE:] I'm happy to say that my app was accepted into the app store using this method. Here it is: https://itunes.apple.com/app/fine-tip-tip-calculator/id563429225
...Dale
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