| S.No | Question |
|---|---|
| 1. | Why did you choose iOS? |
| 2. | What is Swift?What is Objective-C?How it is different from Objective-C? |
| 3. | What is Class, Object |
| 4. | What is Structure?Difference b/w structure & class. |
| 5. | Difference b/w var & let. |
| 6. | What is Optional Type? What is the meaning of “?” |
| 7. | How can you make a property optional? |
| 8. | What is Optional Chaining?? Difference b/w optional chaining & forced unwrapping |
| 9. | What is Array & Dictionary OR What are different collection types available in Swift? |
| 10. | What is Set? |
| 11. | What is Tuples? |
| 12. | What is Functions? |
| 13. | What is Closure Why it is used? |
| 14. | What is Initializers & Self? |
| 15. | What is Inheritance? |
| 16. | What is Protocol? |
| 17. | What is Polymorphism & Runtime polymorphism? |
| 18. | What is Enum? |
| 19. | What is Generics? |
| 20. | What is Extension? |
| 21. | What are Literals?& what are types? |
| 22. | What is lazy stored properties?When is it used? |
| 23. | What are the process to fetching data in swift? |
| 24. | What is Delegate Pattern? |
| 25. | What is View Controller Lifecycle How many ways to create UI (which attach with viewController class)? |
| 26. | What is latest iOS version? |
| 27. | What is latest Xcode version? |
| 28. | What is the Current Macos version? |
| 29. | what is iPhone screen size? |
| 30. | How memory management works in Swift. |
| 31. | What is Cococa and cocoa touch? |
| 32. | What is Swift? |
| 33. | What is a property ? Property type and property observers. |
| 34. | What is "Protocol" in Swift? |
| 35. | What is use of UIApplication class? |
| 36. | What is Access Levels? |
| 37. | What is DeInitializer? |
| 38. | What is Delegation in iOS? |
| 39. | What is difference between "protocol" and "delegate"? |
| 40. | What is "Push Notification"? |
| 41. | What is storyboard? |
| 42. | What happens when we invoke a method on a nil pointer? |
| 43. | What is thread, how to use it? |
| 44. | What is synchronous and asynchronous web request? |
| 45. | Explain stack and heap? |
| 46. | What are the ViewController lifecycle in ios? |
| 47. | Difference between coredata & sqlite? |
| 48. | What is Procedure to push the app in AppStore? |
| 49. | What is the MVC software architecture pattern? |
| 50. | What’s the difference between a xib and a storyboard? |
| 51. | Whats the difference between frame and bounds? |
| 52. | What are the App states. Explain them? |
| 53. | What is Automatic Reference Counting (ARC)? |
| 54. | How can we achieve singleton pattern in iOS? |
| 55. | When an app is said to be in not running state? |
| 56. | Give example scenarios when an application goes into Inactive state? |
| 57. | When an app is said to be in active state? |
| 58. | How can you respond to state transitions on your app? |
| 59. | Who calls the main function of your app during the app launch cycle? |
| 60. | What is the purpose of UIWindow object? |
| 61. | Define View object. |
| 62. | What is App Bundle? |
| 63. | Tell about any four frameworks used in iphone? |
| 64. | What are KVO and KVC? |
| 65. | What is responder chain? |
| 66. | What is Autorelease Pool? |
| 67. | What is Event Loop? |
| 68. | What is Collection? |
| 69. | What is GCD? |
| 70. | What is Dynamic type checking in swift/Objective-C? |
| 71. | What is Completion Handler? |
| 72. | What is Typealias ? |
| 73. | What is defer keyword? |
| 74. | What is the difference between Any,AnyObject? |
| 75. | What is subscript method ? |
| 76. | What is Member wise initialization in Struct? |
| 77. | What is the difference between Frame and Bounds? |
| 78. | What is the difference between Upcast and Downcast? |
| 79. | What is the difference between == and === ? |
| 80. | What does the Swift mutating keyword mean? |
| 81. | How to break out of multiple loop levels? |
| 82. | What is trailing closure syntax? |
| 83. | What is inout parameters? |
| 84. | What is difference between as?, as! and as in Swift? |
| 85. | What's the difference between Self vs self? |
| 86. | What’s the difference between a protocol and a class in Swift? |
| 87. | How is an “ Unowned reference” different from a “Weak Reference”? |
| 88. | When to use a set rather than an array in Swift? |
| 89. | What is the difference between fileprivate and private? |
| 90. | Is there a way to create an abstract class in Swift? |
| 91. | What is Copy on Write (Cow) in Swift? |
| 92. | What is the difference between open and public keywords in Swift? |
| 93. | What is the use of Hashable protocol? |
| 94. | What’s the Fallible initializer init?()? |
| 95. | What is a Variadic function? |
| 96. | What’s the Difference Between Structures and Classes? |
| 97. | What is Optional Chaining? |
| 98. | What Is Optional Binding? |
| 99. | What’s the Difference Between nil and None? |
| 100. | How Can You Disallow a Class from Being Inherited? |
| 101. | What Are Lazy Variables? When Should You Use One? |
| 102. | What is silent Notification? |
| 103. | What is the difference between try, try?, and try! in Swift? |
| 104. | What is the difference between an escaping closure and a none-escaping closure ? |
| 105. | What are opaque return type ? |
| 106. | What are generics and why are they useful ? |
| 107. | What does the CaseIterable protocol do ? |
| 108. | What’s the difference between Raw values and Associated values? |
| 109. | What is Operator Overloading? |
| 110. | How to define optional methods in swift protocols? |
| 111. | How background iOS app gets resumed in foreground? |
| 112. | What are the steps involved when app enter to foreground after device rebooted? |
| 113. | Which is the app state when device is rebooted? |
| 114. | When app is running but not receiving event. In which state app is in? |
| 115. | How an iOS app responds to interrupts like SMS, Incoming Call, Calendar, etc.? |
| 116. | Explain ViewController Life cycle? |
| 117. | Content Hugging priority vs Content Resistance priority? |
| 118. | What is the difference between protocol and delegate? |
| 119. | is it possible that an iOS Application can have more than one window? |
| 120. | Protocol & Delegation vs Notification Center? |
| 121. | What is Automatic Reference Counting (ARC)? |
| 122. | When is Memory Leak happening , how to fix it and how to find? |
| 123. | What is GCD? |
| 124. | What is dispatch queue? |
| 125. | Explain main thread and it’s usages? |
| 126. | What is serial queue? |
| 127. | What is concurrent queue? |
| 128. | Explain three GCD queues? |
| 129. | What is GCD’s Quality of Service? |
| 130. | What is race condition? |
| 131. | What is priority inversion? |
| 132. | What is deadlock? |
| 133. | What is concurrency? |
| 134. | What is NSOperation? |
| 135. | What is semaphore? |
| 136. | What is design pattern and explain briefly some commonly used Cocoa design patterns? |
| 137. | What is Singleton Pattern and why should we avoid over using it? |
| 138. | What is Singleton Pattern and why should we avoid over using it? |
| 139. | What is Decorator Design Pattern ? |
| 140. | What is factory method in Swift? |
| 141. | What is Facade Design Pattern ? |
| 142. | What are the basic differences between creational, structural and behavioural pattern? |
| 143. | What is Adapter Pattern? |
| 144. | What is Observer Pattern ? |
| 145. | What is the delegation pattern? |
| 146. | What is POP? |
| 147. | How would you securely store private user data offline on a device? What other security best practices should be taken? |
| 148. | Could you explain what is the difference between Delegate and KVO? |
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