What is nsmanagedobjectcontext? What are the different concurrency types?

395

---

What is thread safe?

442

---

How many types of background modes supported in ios?

408

---

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

405

---

How you can add frameworks in xcode project?

391

---

What is a difference between stack and heap memory?

386

---

What are different instruments xcode supports for app profiling?

404

---

What do you mean by rest?

443

---

What is the difference between strong and retain.

385

---

How to animate view with constraint?

437

---

What is the difference between weak and strong?

456

---

What is the difference between developer and enterprise developer accounts?

403

---

What are various singleton instances provided by frameworks?

390

---

Explain concept of notification center, local and remote notifications.

344

---

Is there an internet explorer for android?

468

---