The mobile application development landscape is filled with many ways to build a mobile app. Among the most popular are: native iOS, native Android, PhoneGap, Appcelerator Titanium. This article marks the start of a series of four articles covering the technologies above. The series will provide an overview of how to build a simple mobile application using each of these four approaches. Because few developers have had the opportunity to develop for mobile using a variety of tools, this series is intended to broaden your scope. 0) { _tipPercentage = tipPercentage; } else { _tipPercentage = 15.0; } self.tipAmountLabel.text = [NSString stringWithFormat:@"%0.2f%%", _tipPercentage]; } In this application, we want to use whatever tip percentage value was stored in the past. To do this, we can use NSUserDefaults , which is a persistent data store to hold settings and preferences for an application
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