What is the purpose of ios?
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What is the mean of not running state in ios?
How nsoperationque works?
If any app can run in the background, what about battery life?
Explain your process for tracing and fixing a memory leak
What is Automatic Reference Counting (ARC) in iOS operating system?
Do you know what are layer objects and what do they represent?
What is the difference between synchronous & asynchronous task in ios?
What is nsfetchedresultscontroller?
What is difference between 'assign' and 'retain' keyword?
What is the difference between atomic and nonatomic properties? Which is the default for synthesized properties?
what is the difference between nonatomic & atomic ? which is thread safe and why
Is it safe to update to ios 13?