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Application Development in iOS 7
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While developing applications using Xcode and the iOS SDK, you may have noticed that it has never been a requirement to import commonly used header files, such as UIViewController.h or UIView.h.
Open any file in any project, and navigate to any view-controller based .h file in the project. The very first line of code will read as follows:
#import <UIKit/UIKit.h>
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As an iOS developer, you have probably written hundreds of #import statements in any one project. When the compiler reaches an import statement, it literally inserts every line of code found in the imported header file. In the previous example of the first line of code, UIKit.h imports all header files available in the UIKit Framework...
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