ios - Swift: adding / removing observers in init / deinit raise error in Interface Builder -


i've simple swift ui component (https://github.com/mbigatti/bmxcircularbutton) inspectable. in init / deinit methods have calls start , stop observation of highlighted state. 

init(frame: cgrect) {     super.init(frame: frame)     self.addobserver(self, forkeypath: "highlighted", options: .new, context: nil) }  init(coder adecoder: nscoder!) {     super.init(coder: adecoder)     self.addobserver(self, forkeypath: "highlighted", options: .new, context: nil) }  deinit {     self.removeobserver(self, forkeypath: "highlighted") }

doing raise errors interface builder following errors:

file:///users/max/progetti/statusapp/circularbutton/circularbutton/view.xib: error:  live views: failed update auto layout status: interface builder cocoa touch tool raised "nsrangeexception"  exception: cannot remove observer <_ttc17bmxcircularbutton14circularbutton 0x10ba98e00>  key path "highlighted" <_ttc17bmxcircularbutton14circularbutton 0x10ba98e00> because not registered observer.  file:///users/max/progetti/statusapp/circularbutton/circularbutton/view.xib: error:  live views: failed render instance of _ttc17bmxcircularbutton14circularbutton: interface builder cocoa touch tool raised "nsrangeexception"  exception: cannot remove observer <_ttc17bmxcircularbutton14circularbutton 0x10bd055d0>  key path "highlighted" <_ttc17bmxcircularbutton14circularbutton 0x10bd055d0> because not registered observer.

it bug or i'm missing something?

as indicated kevin, best answer here use didset and/or willset in class override since you're adding observer self.

override var highlighted:bool {     didset {         // put observervalue code here     } }

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