Challenge: Busy Board
A busy board is a toddler’s toy that is a collection of knobs, switches, and sliders to manipulate. Every action provides a visible response. To get practice working with controls, create a busy board using some common Cocoa controls.
Create a new Cocoa application like you did in this chapter. Name it BusyApp. Add the following controls:
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a vertical slider and an adjacent text field that reports whether the slider is going up, going down, or staying the same
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two radio buttons that turn the slider’s tick marks on and off
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a checkbox whose label reads “Uncheck me” when it is checked and “Check me” when it is unchecked.
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a secure text field and a button that “reveals” the contents of the secure text ...
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