What is nsmanagedobjectcontext? What are the different concurrency types?

697

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What is thread safe?

731

---

How many types of background modes supported in ios?

695

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How we can execute some code when app is in background?

717

---

How you can add frameworks in xcode project?

747

---

What is a difference between stack and heap memory?

707

---

What are different instruments xcode supports for app profiling?

823

---

What do you mean by rest?

743

---

What is the difference between strong and retain.

680

---

How to animate view with constraint?

704

---

What is the difference between weak and strong?

795

---

What is the difference between developer and enterprise developer accounts?

663

---

What are various singleton instances provided by frameworks?

748

---

Explain concept of notification center, local and remote notifications.

648

---

Is there an internet explorer for android?

846

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