> On 2015 May 23, at 07:10, Marek Hrušovský <xhrus...@gmail.com> wrote:
> 
> Haven't read all the thread but i would use a custom property with overridden 
> setter to call setNeedsDisplay with combination of 
> keyPathsForValuesAffectingValueForKey: I think you can get rid of the glue 
> code.

Yes, but you don’t need an overridden setter.  Amy Worral explains it here:

http://stackoverflow.com/questions/6354368/how-to-observe-change-in-nsobject-properties

My interpretation is to declare a phantom property such as

@property NSInteger lookMaStuffChanged ;

then,

+ (NSSet*)keyPathsForValuesAffectingValueForLookMaStuffChanged {
    return [NSSet alloc] initWithObjects:
        @“whatever1”,
        @“whatever2”,
        …
        nil] ;
}

Finally, observe lookMaStuffChanged with KVO.

In fact, the phantom property lookMaStuffChanged is never affected by anything; 
it’s never even set to anything.

Works for me.


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