uiview frame observer

@interface UIView (FrameObserver)
@end

@implementation UIView (FrameObserver)

- (void)observerFrame {
  [self addObserver:self forKeyPath:@"frame" options:0 context:NULL];
  [self.layer addObserver:self forKeyPath:@"bounds" options:0 context:NULL];
  [self.layer addObserver:self forKeyPath:@"transform" options:0 context:NULL];
  [self.layer addObserver:self forKeyPath:@"position" options:0 context:NULL];
  [self.layer addObserver:self forKeyPath:@"zPosition" options:0 context:NULL];
  [self.layer addObserver:self forKeyPath:@"anchorPoint" options:0 context:NULL];
  [self.layer addObserver:self forKeyPath:@"anchorPointZ" options:0 context:NULL];
  [self.layer addObserver:self forKeyPath:@"frame" options:0 context:NULL];
}

- (void)unObserverFrame {
  [self removeObserver:self forKeyPath:@"frame"];
  [self.layer removeObserver:self forKeyPath:@"bounds"];
  [self.layer removeObserver:self forKeyPath:@"transform"];
  [self.layer removeObserver:self forKeyPath:@"position"];
  [self.layer removeObserver:self forKeyPath:@"zPosition"];
  [self.layer removeObserver:self forKeyPath:@"anchorPoint"];
  [self.layer removeObserver:self forKeyPath:@"anchorPointZ"];
  [self.layer removeObserver:self forKeyPath:@"frame"];
}

- (void)observeValueForKeyPath:(NSString *)keyPath
                      ofObject:(id)object
                        change:(NSDictionary *)change
                       context:(void *)context {
  NSLog(@"------------------------------------------------------------------------------");
  NSLog(@"%@", keyPath);
  NSLog(@"Change list: %@", change);
  NSLog(@"------------------------------------------------------------------------------");
  NSLog(@"%@",[NSThread callStackSymbols]);
}

@end