Explain the difference between copy and retain?

953

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What is the difference between synchronous & asynchronous task ?

921

---

Why do you generally create a weak reference when using self in a block?

883

---

what’s accessibilityhint?

859

---

What is made up of nserror object?

859

---

What is arc and how is it different from autorelease?

834

---

What are the benefits of swift over objective-c ?

868

---

How to avoid anr status?

935

---

Describe the android application architecture.

938

---

What are the multimedia features involved in making android popular?

926

---

What are the different forms of communication provided by the android applications?

866

---

What is the file features used in android?

974

---

What are the different modes of operations used in services for android?

932

---

What are different data storage options are available in android?

951

---

What do you know about intents?

932

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