Objective C Interview Questions

Objective C Interview Questions Download Objective C Interview Questions PDF

Objective C Interview Questions

The most dynamic programming language of all is the Objective-C. Its dynamism liberates a program from the compile time and the vital link-time constraints. It also shifts a significant part of the responsibility regarding source resolution to runtime, when the client is in proper control. The Objective-C programming language is most dynamic of all the other languages since its dynamism springs from three sources:
  1. Dynamic typing—deciding the class of the object at runtime
  2. Dynamic binding—deciding the method which has to be invoked at runtime
  3. Dynamic loading—adding new modules to a program at runtime
A category is a method for adding extra strategies to a class without expanding it. It is also used to include a collection of related strategies. A typical use case is to add built-in classes to worked in classes in the Cocoa structures.
Here are the following distinctive annotations that are accessible in Objective C:
  • _Null_unspecified, which bridges to a Swift certainly unwrapped optional. This is the default.
  • _Nonnull, the esteem won’t be nil it bridges to a customary reference.
  • _Nullable a value can be nil; it bridges to a discretionary.
  • _Null_resettable this value can never be nil, when perused however you can set it to know to reset it. This just applies property.
A message sent to a nil pointer in Objective-C, it’s dealt with as a no-operation. There is no real way to hail it as a blunder since it is anything but a mistake, truth be told, it can be a beneficial element of the language.

An abstraction in OOP is the way toward lessening the undesirable data and keeping up just the relevant data for the clients while polymorphism empowers an object to execute their functions in at least two forms.