sch questions

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• How to zoom while keeping the previous rotation transform as it is?
• Xcode 4.2 how to automatically compile source files dragged into project?
• UIColor and Graphics Context
• when is Big-Oh(n) = Omega(n) ? Is it same as theta(n)?
• How to limit NSArray output in NSLog
• NSDateFormatter stringFromDate keeps returning nil
• iOS - Is it better to use getter/setter methods directly or properties
• Add objects to NSMutableArray
• IOS: AVAudioPlayer stop and play
• Create NSObject from NSDictionary in objective-c