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BEST COLLECTION OF IOS INTERVIEW QUESTIONS WITH ANSWERS.
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NSThread vs GCD
Migrating Away from Threads The idea is that you eliminate work on your part, since the paradigm fits MOST code more easily. It reduces ...
If I call performSelector:withObject:afterDelay: – is the object retained?
Yes, the object is retained. It creates a timer that calls a selector on the current threads run loop. It may not be 100% precise time-wise...
Delegate methods: UIPickerView
Providing Counts for the Picker View – numberOfComponentsInPickerView: – pickerView:numberOfRowsInComponent: Delegate - Setting the Dim...