Custom UIView with animation.

AnimationView.h

// Got from https://stackoverflow.com/questions/10809280/drawrect-circle-and-animate-size-color/10809496#10809496

#import <UIKit/UIKit.h>

// Use IB_DESIGNABLE if you want to see your custom view in Interface Builder (Storyboard or XIB)
IB_DESIGNABLE
@interface AnimationView : UIView

@end

AnimationView.m

// Got from https://stackoverflow.com/questions/10809280/drawrect-circle-and-animate-size-color/10809496#10809496

#import "AnimationView.h"

@implementation AnimationView

+ (Class)layerClass
{
    return [CAShapeLayer class];
}


- (void)layoutSubviews
{
    [self setLayerProperties];
    
    // You can call this method anytime to trigger animations
    // If you left it here, animations will start right away
    [self attachAnimations]; 
}

- (void)setLayerProperties
{
    CAShapeLayer *layer = (CAShapeLayer *)self.layer;
    layer.path = [UIBezierPath bezierPathWithOvalInRect:self.bounds].CGPath;
    layer.fillColor = [UIColor colorWithHue:0 saturation:1 brightness:.8 alpha:1].CGColor;;
}

- (void)attachAnimations
{
    [self attachPathAnimation];
    [self attachColorAnimation];
}

- (void)attachPathAnimation
{
    CABasicAnimation *animation = [self animationWithKeyPath:@"path"];
    animation.toValue = (__bridge id)[UIBezierPath bezierPathWithOvalInRect:CGRectInset(self.bounds, 4, 4)].CGPath;
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    [self.layer addAnimation:animation forKey:animation.keyPath];
}

- (void)attachColorAnimation
{
    CABasicAnimation *animation = [self animationWithKeyPath:@"fillColor"];
    animation.fromValue = (__bridge id)[UIColor colorWithHue:0 saturation:.9 brightness:.9 alpha:1].CGColor;
    [self.layer addAnimation:animation forKey:animation.keyPath];
}

- (CABasicAnimation *)animationWithKeyPath:(NSString *)keyPath
{
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:keyPath];
    animation.autoreverses = YES;
    animation.repeatCount = HUGE_VALF;
    animation.duration = 1;
    return animation;
}


@end