What is completion handler in ios?
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What framework is used to construct application's ios user interface?
What is synchronous web request and asynchronous ?
What are blocks in ios?
What is the purpose of UIWindow object in iOS operating system?
. When an app is said to be in not running state?
Explain app id?
Is core data is thread safe?
What is difference between 'protocol' and 'delegate'?
Explain the application lifecycle in ios?
What is a model class?
What is lazy loading?
How you will store user info (username, password or token) securely in ios?