How to convert NSArray to NSData?

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Use NSKeyedArchiver (which is the last sentence of the post Garrett links):

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:array];

Note that all the objects in array must conform to the NSCoding protocol. If these are custom objects, then that means you need to read up on Encoding and Decoding Objects.

Note that this will create a fairly hard-to-read property list format, but can handle a very wide range of objects. If you have a very simple array (strings for instance), you may want to use NSPropertyListSerialization, which creates a bit simpler property list:

NSString *error;
NSData *data = [NSPropertyListSerialization dataFromPropertyList:array format:NSPropertyListBinaryFormat_v1_0 errorDescription:&error];

There’s also an XML format constant you can pass if you’d rather it be readable on the wire.

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