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The Verge reports that, as of January 2018, there are multi-billion active Apple devices in the world. With the number of iOS users growing steadily across the world, the future looks bright for iOS app developers. Apple and iOS devices continue to have a loyal customer base, helped in part by innovative new devices such as Apple TV and Apple Watch. With that said, an iOS app development certification is probably the easiest way to hone and prove your skills in the same. There has never been a better time to become an iOS developer. If you are preparing to break into a career in iOS app development, look no further! We have created a list of top frequently-asked iOS interview questions that will help you ace your iOS job interview.
However, if you have already given an iOS interview, or have more questions, we encourage you to add them in the comments tab below. Our experts will answer them for you.
|1. Application development environments for OS X||1. Application development environments for iOS|
|2. Includes the Foundation and AppKit frameworks||2. Includes Foundation and UIKit frameworks|
|3. Used to refer any class/object which is based on the Objective-C runtime & inherits from the root class||3. Used to refer the application development using any programmatic interface|
More about it here.
Properties specified as atomic always return a fully initialized object. This also happens to be the default state for synthesized properties. But, if you have a property for which you know that retrieving an uninitialized value is not a risk (e.g. if all access to the property is already synchronized via other means), then setting it to nonatomic can give you better performance than atomic.
An App ID is a two-part string used to identify one or more apps from a single development team. The string consists of a Team ID and a bundle ID search string, with a period (.) separating the two parts. The Team ID is supplied by Apple and is unique to a specific development team, while the bundle ID search string is supplied by the developer to match either the bundle ID of a single app or a set of bundle IDs for a group of apps.
The bundle ID defines each App and is specified in Xcode. A single Xcode project can have multiple targets and therefore output multiple apps. A common use case is an app that has both lite/free and pro/full versions or is branded multiple ways.
The three ways to achieve concurrency in iOS are:
The different iOS application states are:
SpriteKit is a framework for easy development of animated 2D objects.
SceneKit is a framework inherited from OS X that assists with 3D graphics rendering.
SpriteKit, SceneKit, and Metal are expected to power a new generation of mobile games that redefine what iOS devices’ powerful GPUs can offer.
iBeacon.com defines iBeacon as Apple’s technology standard which allows Mobile Apps to listen for signals from beacons in the physical world and react accordingly. iBeacon technology allows Mobile Apps to understand their position on a micro-local scale, and deliver hyper-contextual content to users based on location. The underlying communication technology is Bluetooth Low Energy.
UIButton inherits from UIControl, UIControl inherits from UIView, UIView inherits from UIResponder, UIResponder inherits from the root class NSObject.
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