When does encodeWithCoder get called?

问题

This will save an array (I think).

- (void)encodeWithCoder:(NSCoder *)encoder {
    [encoder encodeObject:myArray forKey:@"myArray"];
}

Do I have to directly call this method when I want to save an array or do I have to do something else?

回答1:

You don’t call this method directly. It’s called by a NSCoder subclass if it needs to serialize that object. If you want to encode an object graph use the class methods archivedDataWithRootObject: or archiveRootObject:toFile: of NSKeyedArchiver. This in turn will call the encodeWithCoder: method of your objects. Also note that every object in your array has to implement the NSCoding protocol.

来源：https://stackoverflow.com/questions/3741893/when-does-encodewithcoder-get-called