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Description

http://spin.atomicobject.com/2011/06/16/objective-c-keypath-bindings/

KeyPathBindings is a library for binding a property to a key path on another object. This can be particularly useful when you want a property on an object to mirror a property on another object. The library can optionally be configured with MAZeroingWeakRef to automatically zero bindings.

Note: This library subclasses observed objects -- which means already KVO'd objects will not work.

Example

  @interface MySlider : NSObject
  {
    CGFloat percentComplete
  }

  @property(nonatomic, assign) CGFloat *percentComplete;
  @end
  
  ...
  
  [request bindProperty:@"percentComplete" onTarget:mySlider toKeyPath:@"percent"];
  
  request.percent = 0.54f;
  NSCAssert(mySlider.percentComplete == request.percent);

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