What is singleton in ios swift?
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How do you stop apps running in the background on ios?
What is the 'interface' and 'implementation'?
How do I get rid of app errors on iphone?
What are the App states in iOS operating system? Explain them
Bundle & document directory, sandbox ?
How nsoperationque works?
Do you know which json framework is supported by ios?
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Is uikit thread safe?
What is use of nsoperation?
Flow of push notification?