How to Develop an Application on a MacBook
Apple Mac computers run on an advanced operating system, called Mac OS X. This operating system differs from some operating systems (such as Windows) but shares similarities with others (Linux). However, since Mac OS X represents its own unique platform with its own foundation of code libraries and user interfaces developing applications for it generally requires use of a Mac computer. The most reliable way to create Mac Applications is on a Mac computer using Mac software development tools such as Xcode.
Instructions
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Download and install Xcode. You can do this by navigating to developer.apple.com/xcode/, which will take you to the app store to download the latest version. You can also register for the Apple developer program at developer.apple.com/devcenter/ios/index.action to access older versions of Xcode for older systems.
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After Xcode installs, begin a new application project by starting Xcode and selecting the "File" menu from the Mac task bar. In the File menu, click "New...," then click "New Project."
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In the project template window select "Application" under the "Mac OS X" menu on the left-hand side of the window. You can choose to build a command-line tool (for use with the Terminal app), or build an application that utilizes the Mac Cocoa libraries and the Objective-C programming language, both developed for Mac OS.
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Learn Objective-C and how to use the Cocoa libraries. Apple has tutorials on both at developer.apple.com/library/mac/navigation. While other programs can be written for Macs in other programming languages, native applications that run with support of Apple code libraries will use Objective-C and Cocoa.
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