What is nsmanagedobjectcontext? What are the different concurrency types?

753

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What is thread safe?

777

---

How many types of background modes supported in ios?

733

---

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

771

---

How you can add frameworks in xcode project?

805

---

What is a difference between stack and heap memory?

767

---

What are different instruments xcode supports for app profiling?

893

---

What do you mean by rest?

795

---

What is the difference between strong and retain.

725

---

How to animate view with constraint?

772

---

What is the difference between weak and strong?

842

---

What is the difference between developer and enterprise developer accounts?

718

---

What are various singleton instances provided by frameworks?

809

---

Explain concept of notification center, local and remote notifications.

692

---

Is there an internet explorer for android?

896

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