when using core data there is a text field that sets a value for an entity's string property.
when this property is changed i want a whole bunch of things to change when depending on what that string was.
what i did was (what i think) override the setPropertyOne and getPropertyOne methods (where propertyOne is the string property of the class)
using the core data utility tutorial as a guide i typed something like this:
now this all works fine... other than the point where i undo and redo
undo works fine, changing propertyOne back to the prior string works... redo breaks
it breaks with this being printed out to the console:
also when i added code to make new entityTwo instances and add them to the set that carries those instances undo would work fine, but if i did that then the program would crash without saying anything when i went to add a new instance of entityOne
when this property is changed i want a whole bunch of things to change when depending on what that string was.
what i did was (what i think) override the setPropertyOne and getPropertyOne methods (where propertyOne is the string property of the class)
using the core data utility tutorial as a guide i typed something like this:
Code:
-(NSString*)propertyOne {
[self willAccessValueForKey: @"propertyOne"];
NSString* s = propertyOne;
[self didAccessValueForKey: @"propertyOne"];
return s;
}
-(void)setPropertyOne: (NSString*)newPropertyOne {
[self willChangeValueForKey: @"propertyOne"];
propertyOne = newPropertyOne;
[self didChangeValueForKey: @"propertyOne"];now this all works fine... other than the point where i undo and redo
undo works fine, changing propertyOne back to the prior string works... redo breaks
it breaks with this being printed out to the console:
also when i added code to make new entityTwo instances and add them to the set that carries those instances undo would work fine, but if i did that then the program would crash without saying anything when i went to add a new instance of entityOne