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];

}