Question

Can anyone suggest a method to read bytes from NSData (like read function in @interface NSInputStream : NSStream)

Answer 1

You can also create an NSInputStream from an NSData object, if you need the read interface:

NSData *data = ...;
NSInputStream *readData = [[NSInputStream alloc] initWithData:data];
[readData open];

However, you should be aware that initWithData copies the contents of data.