Keychain (this includes email account passwords, Wi-Fi passwords, and passwords you enter into websites and some other applications. If you encrypt the backup with iOS 4 and later, the keychain information is transferred to the new device. With an unencrypted backup, the keychain can only be restored to the same iPhone or iPod touch. If you are restoring to a new device with an unencrypted backup, you will need to enter these passwords again.)
Automatic Reference Counting (ARC) largely removes the burden of manual memory management, not to mention the chore of tracking down bugs caused by leaking or over-released objects! Despite its awesomeness, ARC does not let you ignore memory management altogether. This post covers the following key aspects of ARC to help you get up and running quickly. Reference Counted Memory: Quick Revision How Automatic Reference Counting Works Enabling ARC in Your Project New Rules Enforced by ARC ARC Qualifiers – Declared Properties ARC Qualifiers – Regular Variables Migrating Existing Projects to ARC Including Code that is not ARC Compliant Should I Use ARC? The Long Weekend Website
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