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https://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/KeyValueCoding/Articles/SearchImplementation.html#//apple_ref/doc/uid/20000955-CJBBBFFA那一段他说的是
Otherwise (no simple accessor method is found), searches the class of the receiver for methods whose names match the patterns countOf<Key> and objectIn<Key>AtIndex: (corresponding to the primitive methods defined by the NSArray class) and <key>AtIndexes: (corresponding to the NSArray method objectsAtIndexes:).If the countOf<Key> method and at least one of the other two possible methods are found, a collection proxy object that responds to all NSArray methods is returned. Each NSArray message sent to the collection proxy object will result in some combination of countOf<Key>, objectIn<Key>AtIndex:, and <key>AtIndexes: messages being sent to the original receiver of valueForKey:. If the class of the receiver also implements an optional method whose name matches the pattern get<Key>:range: that method will be used when appropriate for best performance.