What is 1x 2x and 3x in ios?
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Is it possible to write a program without using nib file
What is reference count in ios?
When is an app said to be in active state?
Does objective-c contain private methods?
What framework is used to construct application's ios user interface?
Explain place holder constraint
What is datasource in ios?
What is the difference between let and var in swift?
What is synchronous web request and asynchronous ?
How we can execute some code when app is in background?
Tell about block and GCD
What is atomic and non atomic in ios?