Before editing the Nibs, one should:

What is the return value of function CGColorGetAlpha of class CGColor?

What is the default value of allowsEditing property of UIImagePickerController class in iPhone OS 4.0?

Which properties of the UIImage class affects the way the image data is displayed when drawn?

When using a Cocoa framework, what will all ControlEvents method of UIControl class return in case it fails to create the object?

How much time in seconds will it take to display an animation if you have 60 images using UIImageView class for the property animationDuration?

Which UILabel properties help adjust text within a UILabel?

Which is the correct way to transfer data from one view controller to another?

Which is the correct way to check whether the view controller view is loaded or visible?

Which properties would be used to draw a shadow under UIView?

Which is the correct way to set UIButton's Highlight Tint color programmatically?