Design Patterns
A design pattern solves a common software engineering problem. Design patterns are not actual snippets of code, but instead are abstract ideas or approaches that you can use in your applications. Good design patterns are valuable and powerful tools for any developer.
The consistent use of design patterns throughout the development process reduces the mental overhead in solving a problem so you can create complex applications more easily and rapidly. Here are some of the design patterns that you have already used:
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Delegation: One object delegates certain responsibilities to another object. You used delegation with the UITextField to be informed when the contents of the text field change.
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Data source: A data ...
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