What is nsmanagedobjectcontext? What are the different concurrency types?

775

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What is thread safe?

792

---

How many types of background modes supported in ios?

744

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

785

---

How you can add frameworks in xcode project?

817

---

What is a difference between stack and heap memory?

779

---

What are different instruments xcode supports for app profiling?

904

---

What do you mean by rest?

805

---

What is the difference between strong and retain.

738

---

How to animate view with constraint?

788

---

What is the difference between weak and strong?

857

---

What is the difference between developer and enterprise developer accounts?

729

---

What are various singleton instances provided by frameworks?

826

---

Explain concept of notification center, local and remote notifications.

701

---

Is there an internet explorer for android?

912

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