How can we achieve singleton pattern in iOS?

CuriousTab

Discussion

Home ‣ Interview ‣ Technology See What Others Are Saying!

Question
How can we achieve singleton pattern in iOS?

Correct Answer

The Singleton design pattern ensures a class only has one instance, and provides a global point of access to it The class keeps track of its sole instance and ensures that no other instance can be created Singleton classes are appropriate for situations where it makes sense for a single object to provide access to a global resourceSeveral Cocoa framework classes are singletons They includeNSFileManager, NSWorkspace, NSApplication, and, in UIKit,UIApplication A process is limited to one instance of these classes When a client asks the class for an instance, it gets a shared instance, which is lazily created upon the first request

More questions

1. How would you automatically transfer your visitors to a new web page?

Discuss

Correct Answer: - You can do it with the help of meta tag mentioned below:

<META HTTP-EQUIV="Refresh" CONTENT="2"; URL="https://wwwyoursitecom">

Place this tag between <HEAD></HEAD> - It will load yousitecom in 2 seconds

3. Cash Reserve Ratio ( CRR) and Stautory Liquidity Ratio (SLR ) are terms most closely related to which of the following industries/markets :
Options
A. Mutual Fund
B. Income Tax
C. Stock Exchange
D. Banking

Discuss