Chapter 26. Creating NSFormatters

A formatter takes a string and makes another object, typically so that the user can type something that is more than simply a string. For example, when passed the string “3/17/1975”, the NSDateFormatter converts it into an NSDate object that represents the seventeenth day of March in the year 1975 (Figure 26.1).


Figure 26.1. NSDateFormatter

Also, a formatter can take an object and create a string for the user to see. For example, imagine a text field that has an NSDateFormatter. When the text field is sent setObjectValue: with an NSCalendarDate object, the date formatter will create a string that represents that date. ...

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