相关代码展示：

- (IBAction)toggleRoundCorners:(id)sender {

    [CATransaction setDisableActions:![_enableAnimations isOn]];

    [CATransaction setAnimationDuration:_animationDuration];

    [_layer setCornerRadius:([_layer cornerRadius] == 0.0 ? 25.0 : 0.0)];

}

- (IBAction)toggleColor:(id)sender {

    [CATransaction setDisableActions:![_enableAnimations isOn]];

    [CATransaction setAnimationDuration:_animationDuration];

    [_layer setBackgroundColor:([_layer backgroundColor] == [UIColor blueColor].CGColor ? [UIColor greenColor].CGColor : [UIColor blueColor].CGColor)]; 

}

- (IBAction)toggleBorder:(id)sender {

    [CATransaction setDisableActions:![_enableAnimations isOn]];

    [CATransaction setAnimationDuration:_animationDuration];

    [_layer setBorderWidth:([_layer borderWidth] == 0.0 ? 10 : 0.0)];

}

- (IBAction)toggleOpacity:(id)sender {

    [CATransaction setDisableActions:![_enableAnimations isOn]];

    [CATransaction setAnimationDuration:_animationDuration];

    [_layer setOpacity:([_layer opacity] == 1.0 ? 0.2 : 1.0)];

}

- (IBAction)toggleSize:(id)sender 

{

    [CATransaction setDisableActions:![_enableAnimations isOn]];

    [CATransaction setAnimationDuration:_animationDuration];

    CGRect layerBounds = _layer.bounds;

    layerBounds.size.width  = (layerBounds.size.width == layerBounds.size.height) ? 250.0 : 200.0;

    [_layer setBounds:layerBounds];

    BTSAnchorPointLayer *anchorPointLayer = [[_layer sublayers] objectAtIndex:0];

    [anchorPointLayer setPosition:BTSCalculateAnchorPointPositionForLayer(_layer)];

}

- (void)beginAnimatingLayer

{

    // Here we are creating an explicit animation for the layer‘s "transform" property.

    // - The duration (in seconds) is controlled by the user.

    // - The repeat count is hard coded to go "forever".

    CABasicAnimation *pulseAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];

    [pulseAnimation setDuration:_animationDuration];

    [pulseAnimation setRepeatCount:MAXFLOAT];

    // The built-in ease in/ ease out timing function is used to make the animation look smooth as the layer

    // animates between the two scaling transformations.

    [pulseAnimation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

    // Scale the layer to half the size

    CATransform3D transform = CATransform3DMakeScale(0.50, 0.50, 1.0);

    // Tell CA to interpolate to this transformation matrix

    [pulseAnimation setToValue:[NSValue valueWithCATransform3D:CATransform3DIdentity]];

    [pulseAnimation setToValue:[NSValue valueWithCATransform3D:transform]];

    // Tells CA to reverse the animation (e.g. animate back to the layer‘s transform)

    [pulseAnimation setAutoreverses:_autoreverses];

    // Finally... add the explicit animation to the layer... the animation automatically starts.

    [_layer addAnimation:pulseAnimation forKey:kBTSPulseAnimation];

}

- (void)endAnimatingLayer

{

    [_layer removeAnimationForKey:kBTSPulseAnimation];

}