Key elements in iPhone Application
Key elements in iPhone Application are window and views, event handling cycle, memory management, security and the Info.plist file.
Window and Views – Window provides the background platform for displaying content. Views do work of drawing content and responding to user interactions.
Event handling cycle – infrastructure of the UIApplication object that takes event off the top of queue and delivers it to the responder object, typically to the UIWindow object that represents the application’s main window.
Memory management – each application has its own virtual address space, the same system could be found in Mac OS X.
Application security – sandbox restricts an application (including its preferences and data). It starts during the installation process, the system creates the application’s home directory and several key subdirectories, and configures the application sandbox. Then application and its data reside in a this location that no other application can access.
Info.plist – defines the contents and behavior of application.