Uplift iOS Interview
"Uplift iOS Interview" is a comprehensive guide to help aspiring iOS developers soar to new heights in their careers. This book is an indispensable tool for anyone looking to crack the iOS interview and impress their future employers with their technical prowess. With in-depth coverage of Swift, AutoLayout, SwiftUI, Multithreading, Memory management so on and so forth, this book is a treasure trove of knowledge for anyone looking to uplift their iOS development career.
In Swift, If you conform to a protocol you need to implement all its methods or properties. Optional methods are not allowed when implementing protocols. For instance:
protocol ImageDownloadable { func downloadDidStart() func downloadDidEnd() func downloadDidStop() func progressBarShouldStartMoving() -> Bool func progressBarDidFinishMoving() -> Bool func progressBarShouldHidden() -> Bool }
We can try some tricks to make the optional methods.
- Use default implementation using the extension.
- Splitting the protocols with many protocols and conform only necessary one. You can use typealias(How and when to use typealias in Swift?) to merge protocols.
- Using the
@objc
attribute on a Swift protocol. It provides the opportunity to mark methods as being optional. In this case, you can not usestructs
,enums
andprotocol
extensions with that protocol.
// First scenario protocol ImageDownloadable { func downloadDidStart() func downloadDidEnd() func downloadDidStop() func progressBarShouldStartMoving() -> Bool func progressBarDidFinishMoving() -> Bool func progressBarShouldHidden() -> Bool } extension ImageDownloadable { func downloadDidEnd() { ... } } // downloadDidEnd is optional // Second scenario protocol ImageDownloadStatusProviding { func engineDidStart() func engineWillStop() func engineDidStop() } protocol ProgressBarStatusProviding { func progressBarShouldStartMoving() -> Bool func progressBarDidFinishMoving() -> Bool func progressBarShouldHidden() -> Bool } // Third scenario @objc protocol ImageDownloadable { // Optional @objc func downloadDidStart() @objc func downloadDidEnd() @objc func downloadDidStop() // Non-optional func progressBarShouldStartMoving() -> Bool func progressBarDidFinishMoving() -> Bool func progressBarShouldHidden() -> Bool }
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- Uplift iOS Interview - A Comprehensive Guide to iOS Interview
- Xcode Cheat Sheet for Swift
- Xcode Cheat Sheet for SwiftUI
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