A value indicating that a requested item couldn’t be found or doesn’t exist.
SDKs
- iOS 9.0+
- macOS 10.11+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
Framework
- Foundation
Declaration
const NSInteger NSNotFound;
Discussion
NSNot is typically used by various methods and functions that search for items in serial data and return indices, such as characters in a string object or id objects in an NSArray object.
Special Considerations
Prior to OS X v10.5, NSNot was defined as 0x7fffffff. For 32-bit systems, this was effectively the same as NSInteger. To support 64-bit environments, NSNot is now formally defined as NSInteger. This means, however, that the value is different in 32-bit and 64-bit environments. You should therefore not save the value directly in files or archives. Moreover, sending the value between 32-bit and 64-bit processes via Distributed Objects will not get you NSNot on the other side. This applies to any Cocoa methods invoked over Distributed Objects and which might return NSNot, such as the index method of NSArray (if sent to a proxy for an array).