Swift Interview Questions

Swift Interview Questions Download Swift Interview Questions PDF

Swift Interview Questions

  • Firstly, determine the iOS version or model of the device.
  • Collect enough information to reproduce the issue.
  • If possible, acquire device logs.
  • Acquire tooling or create a unit test and begin debugging once you get the idea of the nature of the issue.
Declaring a question mark “?” in the code can make a property optional.
If a property doesn’t hold a value, then this symbol “?” helps in avoiding the runtime errors.
There are four data types that the developers mostly use in Objective – C.
  • BOOL – It represents a Boolean value that is true or false.
  • NSInteger – It represents an Integer.
  • NSString – It represents a string.
  • Cgfloat – It represents a floating-point value.
Basically, it is a type that contains a group of various related values under the same umbrella.
  • Firstly, think like a user while designing the UX.
  • Consider all the situations that prove to be useful while promoting an App.
  • Continue to work on the utility of the App, even after the launch.
It lets you group a series altogether to perform a specific task.A function once created can be over and over in the code, and in case you find a repeating statement in the code, then the function can be the answer to avoid the repetition.
  • Variables are always initialized before use.
  • Memory is managed automatically.
  • Arrays and integers are checked for overflow.
  • Switch function can be used instead of using “if” statement.
  • It eliminates the classes that are in unsafe mode.
The multiple line comment is written in between the symbols (/*) at the start and (*/) at the end.
Regular Expression – These are the special string patterns that describe how a search is performed through a string.Responder Chain – It is a hierarchy of objects that obtain the opportunity to respond to the events.
The states of the common execution can be as follows:
  • Not running – This state means that there is no code that is being executed and the application is completely switched off.
  • Inactive – This state means that the application is running in the background and is not receiving any events.
  • Active – This state means that the applications are running in the background and is receiving the events.
  • Background – This state means that the application is executing the code in the background.
  • Suspended – This state means that the application is in the background and is not executing.
It enables you to store the key-value pairs and access the value by providing the key.It is similar to that of the hash tables in other programming languages.
Adapter – It lets the classes with incompatible interfaces to work together and it wraps itself around the object to expose a standard interface to interact with that object.Memento – This pattern in iOS is used as a part of state restoration.

That is this externalized state can be restored without violating any encapsulation.This pattern is especially used for the archiving in Apple.