What is nsmanagedobjectcontext? What are the different concurrency types?

765

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What is thread safe?

789

---

How many types of background modes supported in ios?

739

---

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

778

---

How you can add frameworks in xcode project?

810

---

What is a difference between stack and heap memory?

777

---

What are different instruments xcode supports for app profiling?

901

---

What do you mean by rest?

798

---

What is the difference between strong and retain.

732

---

How to animate view with constraint?

779

---

What is the difference between weak and strong?

850

---

What is the difference between developer and enterprise developer accounts?

722

---

What are various singleton instances provided by frameworks?

815

---

Explain concept of notification center, local and remote notifications.

697

---

Is there an internet explorer for android?

907

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