How to avoid retain cycle when use a NSTimer, what's the relationship between timer and runloop.
Ios Lead Interview Questions
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1. What is view controller 2. What is navigation view controller 3. What is inheritance 4. difference between objective c and swift 5. what is thread 6. what is category 7. what is atomic and nonatomic 8. which are application state 9. what is difference between inactive state and background state Machine Test 1. Json parsing 2. Show data from json to table view 3. On cell's long press, cell data should be removed from table view 4. Insert data from json to sqlite database 5. On loading app or refresh, data should be came from sqlite database.
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