What is the Objective-C way of getting a nullable bool?
An NSNumber instance might help. For example:
NSNumber *yesNoOrNil;yesNoOrNil = [NSNumber numberWithBool:YES]; // set to YESyesNoOrNil = [NSNumber numberWithBool:NO]; // set to NOyesNoOrNil = nil; // not set to YES or NOIn order to determine its value:
if (yesNoOrNil == nil){ NSLog (@"Value is missing!");}else if ([yesNoOrNil boolValue] == YES){ NSLog (@"Value is YES");}else if ([yesNoOrNil boolValue] == NO){ NSLog (@"Value is NO");}On all Mac OS X platforms after 10.3 and all iPhone OS platforms, the -[NSNumber boolValue] method is guaranteed to return YES or NO.
I think you will need to use some class for that, e.g. wrap bool to NSNumber object.