Understanding Compatibility Issues with xCode and iOS 4.2.1

Erasing UI Elements from a Dynamic Screen Using Quartz 2D and Core Graphics

Understanding the iPhone App's UI Freeze on Foreground Arrival: Causes and Solutions

Mastering Single-View Apps on iOS for a Flexible User Interface

Understanding UIBackgroundTaskInvalid: A Deep Dive into iOS Background Tasks

iOS Backgrounding: How to Distinguish Between Screen Lock and Home Button Press Events on iOS 5