What is nsmanagedobjectcontext? What are the different concurrency types?

758

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What is thread safe?

786

---

How many types of background modes supported in ios?

738

---

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

775

---

How you can add frameworks in xcode project?

806

---

What is a difference between stack and heap memory?

768

---

What are different instruments xcode supports for app profiling?

898

---

What do you mean by rest?

796

---

What is the difference between strong and retain.

730

---

How to animate view with constraint?

775

---

What is the difference between weak and strong?

849

---

What is the difference between developer and enterprise developer accounts?

721

---

What are various singleton instances provided by frameworks?

814

---

Explain concept of notification center, local and remote notifications.

697

---

Is there an internet explorer for android?

903

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