Develop for iOS (Apple) 4

All of the utilities, such as voice memos, clock, calculator, and compass are in one folder called "Utilities" in 4.0.[20][21] Many of the included applications are designed to share data (e.g., a phone number can be selected from an email and saved as a contact or dialed for a phone call).

The iPod Touch retains the same applications that are present by default on the iPhone, with the exception of the Phone, Messages, Compass and Camera apps. The "iPod" App present on the iPhone is split into two apps on the iPod Touch: Music, and Videos. The bottom row of applications is also used to delineate the iPod Touch's main purposes: Music, Videos, Safari, and App Store (Dock Layout was changed in 3.1 Update). For the 4th Generation iPod touch, it includes FaceTime and Camera, and the dock layout had changed to Music, Mail, Safari, Video.


The iPad comes with the same applications as the iPod Touch excluding Stocks, Weather, Clock, Calculator, and the Nike + iPod app. Separate music and video apps are provided, as on the iPod Touch, although (as on the iPhone) the music app is named "iPod". Most of the default applications are completely rewritten to take advantage of the iPad's larger display. The default dock layout includes Safari, Mail, Photos and iPod.

Multitasking

Before iOS 4, multitasking was limited to a selection of the applications Apple included on the devices.[22] Apple worried that running multiple third-party applications simultaneously would drain batteries too quickly. Starting with iOS 4, on 3rd-generation and newer iOS devices, multitasking is supported through seven background APIs:[23]

   1. Background audio
   2. Voice over IP
   3. Background location
   4. Push notifications
   5. Local notifications
   6. Task finishing
   7. Fast app switching

Switching applications

Double-pressing the home button activates the application switcher. A scrollable dock-like interface appears from the bottom, moving the contents of the screen up. Choosing an icon switches to an application. To the far left are icons which function as music controls, and a rotation lock. Holding the icons briefly makes them wiggle (similarly to the homescreen) and allows the user to quit the applications.

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