Here's a rewritten version of the provided text in a more concise and organized format:

Understanding File Downloads with NSMutableURLRequest: Maxing Out the Chunk Size

Accessing and Totalling Data with NSUserDefaults in iOS Development: Best Practices and Strategies

Understanding Memory Leaks in Objective-C: A Guide to Safe Code Development

Forcing an On-Screen Keyboard to Appear When a Bluetooth Keyboard is Connected on iOS Devices

Core Animation in iOS: Can it Handle Complex Enlargements?