Adding Input Clicks
Use the UIDevice class to add input clicks to your custom input accessory views. The playInputClick method plays the standard system keyboard click and can be called when you respond to user input taps.
Adopt the UIInputViewAudioFeedback protocol in the accessory input class and add an enableInputClicksWhenVisible delegate method that always returns YES. This defers audio playback to the user’s preferences, which are set in Settings > Sounds. To hear these clicks, the user must have enabled keyboard click feedback. If the user has not done so, your calls to playInputClick are simply ignored.
Recipe 6-6 Creating a Custom Input Controller for a Nontext View
@interface ColorView : UIView @property ...
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