Which Core Audio Service framework is used to record, play back, pause, loop, and synchronize audio in iPhone OS 4.0?

What method definition do if the value of the accessed counter is 0? - (void)discardContentIfPossible

If the code is written using the Core Foundation and Foundation macros, the simplest way to create strings files is:

What is the function of the Code Sense feature in Xcode?

Which statement is correct regarding functions fopen and open in generic C?

What happens if Xcode is not able to find a file or folder at the path defined for it in the project?

How can you create an OpenGL ES texture with a .png image?

What is the use of Alpha value that is available in attributes of every Interface Builder object?

The configuration data of table view objects in Xcode 4.x is loaded from:

Which two are true about (void)didReceiveMemoryWarning method?

You are developing an application for iOS in Xcode 4.x. Which option will check if a text field with id 'TextField' is empty or not, and displaying it in a label with the id 'Output'?