Objective-C (Computer program language) Programming 19 Object-oriented programming (Computer science) 18 iOS (Electronic resource) 16 Development 14 Macintosh (Computer) 12 Application software 10 Computer Science 9 Engineering & Applied Sciences 9 iPhone (Smartphone) 9 Computer software 5 Mac OS 5 Java (Computer program language) 4 Cocoa (Software framework) 3 Mobile apps 3 Mobile computing 3 Security measures 3 Application program interfaces (Computer software) 2 Cocoa (Application development environment) 2 Computer security 2 Design 2 Object-oriented programming languages 2 Software protection 2 Swift (Computer program language) 2 iPad (Computer) 2 C (Computer program language) 1 Computer games 1 Computer networks 1 Core Data framework 1 Database design 1