Q: Precisely what is a selector and what is its purpose? Provide an example of exactly where And exactly how it might be utilised.

Right before iOS 5, the developer necessary to manually handle the threads. Having said that, the discharge of iOS five included new techniques to the managed object context to reduce the need for handbook thread management; as a substitute you could properly entry Main Facts objects via a block of code passed for the performBlock: or performBlockAndWait: approaches.

Apple is lastly organizing a Calculator app for your iPad, above fourteen decades right after launching the product, In line with a resource acquainted with the issue. iPadOS 18 will involve a created-in Calculator app for all iPad models that are appropriate Along with the computer software update, which is predicted to become unveiled in the opening keynote of Apple's yearly developers meeting WWDC on June ten. AppleInsider...

A common reason for exc_bad_access glitches that aren't detectable because of the compiler is attempting to access unveiled objects. In this kind of conditions, enabling NSZombies in Xcode might be an efficient debugging approach. Enabling NSZombies retains objects that may Typically be produced alive as “zombies”.

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Q: How will you Verify dynamically at runtime to find out if a class supports a method that can respond to a particular concept?

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The respondsToSelector: approach returns a Boolean value that indicates whether or not the receiver implements or inherits a way that could respond to a specified message.