Explain the difference between copy and retain?

987

---

What is the difference between synchronous & asynchronous task ?

966

---

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

924

---

what’s accessibilityhint?

908

---

What is made up of nserror object?

903

---

What is arc and how is it different from autorelease?

878

---

What are the benefits of swift over objective-c ?

913

---

How to avoid anr status?

973

---

Describe the android application architecture.

984

---

What are the multimedia features involved in making android popular?

973

---

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

907

---

What is the file features used in android?

1018

---

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

971

---

What are different data storage options are available in android?

983

---

What do you know about intents?

979

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