Must known iOS concepts for Interview for 5+ years experience - Part 2

Must known iOS concepts for Interview for 5+ years experience - Part 2

Now a days question may ask in any way so having good knowledge on concept is important.
You can check part-1, Here are the concepts which they will ask questions.

5. Memory Management

nonatomic(not a thread safe), atomic(default,thread safe), strong(retain for older ios versions)(take ownership of the object) , weak(from ios 5) or unretain_unsafe(ios4)(set to nil), assign(for primitive types won't retain), unowned, Instruments , retain cycles, memory leaks,

retaincounts, mutable and immutable, stack and heap memory,

6. APNS push notifications,

   Silent notification how it works in foreground and background,

   Payload size,

   Voice notifications,

   Procedure for enable push notifications.KVO KVC KVP

7. Design Patterns (Creational, Structural & Behavioural)

(Singleton,Facade), (MVC, MVVM), (Observer)  Delegate,

8. AutoLayouts, Constraints, SizeClasses, XIB nib, stackviews, Animation Layers

9. WebServices, REST API, XML ,

    NSURLSession(Data Task, Download Task, UpLoadTask)

    NSURLConnection AFNetworking AlamoFire, http & https

    JSON Serialization,

    POST vs GET,

    PUT VS POST

10. Unit tests ( XCTAssertEqualObjects, XCTAssertEqual, XCTFail, XCTAssertNil, XCTAssertTrue, XCTAssertFalse) and UI Tests.

11. Continous Integration,

     AppStore process & Code Coverage,

     Xcode Editors,

     App thinning(Slicing,Bit Code,On Demand Resources)

12. App Security : Cryptography, Encryption, Encoding, Algorithms,

Advanced Encryption Standard (AES) algorithm,

Symmetric & asymmetric encryption hashing algorithm,

Secure Hash Algorithm 2 (SHA), RSA

13. Data Structures : Any data structure may ask and mostly asked data structure are Binary Search , Stack , Queue, Linked List.

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Must known iOS concepts for Interview for 5+ years experience - Part 1

Must known iOS concepts for Interview for 5+ years experience - Part 1

Now a days question may ask in any way so having good knowledge on concept is important. Here are the concepts which they will ask questions.

1. OOPS + Basic related :

Inheritance, Polymorphism, Override, Message passing, Class, Object,

Protocols, Delegate, Categories, Extensions, subClassing, Lazy loading,

Designating Initializers, Method Swizzling, Dot and Arrow Access [],

self without self, Properties, Instance methods, Class methods,

Functions, Methods, Caching in ios, Dequeue, reuse identifier,

coupling concept,

Difference b/w array and linked list,

Can you Access singleton object in @synchronised block

2. Threading:

Dispatch_queues (concurrent,serial,dispatch groups,dispatch semaphores, custom queue,dispatch_after,

dispatch_async,dispatch_sync,dispatch_apply(Submits a block to a dispatch queue for multiple invocations.)

Queue priorities low,high,background,default)

Completion blocks

3. Data base:

Core Data (NSManagedObjectContext, NSPersistantStoreCoordinator, PersistentObjectStore, ManagedObjectModel, SQLite File)

Realm ()

Sqlite3(Zero Configuration,Traditional SQl style)

plist,keychainaccess,NSUserDefaults

4. Swift

   Basics:(constants and variables) let and var,

• Type Annotation with colon var x : String, declare multiple in a singleline like var x,y,z : Int
• Conversion let three = "3" let x = Int(three)
• typealias TestInt = Int
• Booleans true,false
• Tuples : Tuples group multiple values into a single compound value.
• let (statusCode, statusMessage) = http404Error
• Optionals (Handles the nil values using ? and !)
• optional Binding using if let

Error Handling: Do catch (do { stmnt } catch {stmnt }), func throws(throwing functions),

Converting errors to optional values (let try? somefunc()),

Disable error propagation with try!

Assertions and Preconditions

  Control Flow for in , continue , switch , repeat, fallthrough, break, return, guard let, #available

  Closures(escaping , nonescaping, It is value type)

  Enumerations(Associated Values)

  SubScripts(shortway to access arrays and dict)

  In out params(modify the function params)

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Posted in: ios concepts,ios interview questions,ios programming interview questions,objective c interview questions,typical ios interview questions