Square button with background animation on touch down and up (Highlight)

ARLSquareButton.h

#import <UIKit/UIKit.h>

@interface ARLSquareButton : UIButton

@property (nonatomic, strong) IBInspectable UIColor *highlightedBackgroundColor;
@property (nonatomic, assign) IBInspectable CGFloat cornerRadius;

@end

ARLSquareButton.m

#import "ARLSquareButton.h"

IB_DESIGNABLE

@interface ARLSquareButton()

@property (nonatomic, strong) UIColor *normalBackgroundColor;

@end

@implementation ARLSquareButton

- (instancetype)initWithCoder:(NSCoder *)coder
{
    self = [super initWithCoder:coder];
    [self setup];
    return self;
}

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    [self setup];
    return self;
}

- (void)setup
{
    self.highlightedBackgroundColor = [UIColor lightGrayColor];
    
    [self addTarget:self action:@selector(processTouchDown:) forControlEvents:UIControlEventTouchDown];
    [self addTarget:self action:@selector(processTouchDown:) forControlEvents:UIControlEventTouchDragEnter];
    [self addTarget:self action:@selector(processTouchUp:) forControlEvents:UIControlEventTouchUpInside];
    [self addTarget:self action:@selector(processTouchUp:) forControlEvents:UIControlEventTouchDragExit];

}

- (void)setCornerRadius:(CGFloat)cornerRadius
{
    self.layer.cornerRadius = cornerRadius;
}

- (CGFloat)cornerRadius
{
    return self.layer.cornerRadius;
}

- (void)setBackgroundColor:(UIColor *)backgroundColor
{
    [super setBackgroundColor:backgroundColor];
    self.normalBackgroundColor = backgroundColor;
}

- (UIColor *)backgroundColor
{
    return self.normalBackgroundColor;
}

- (void)processTouchDown:(id)sender
{
    [super setBackgroundColor:self.highlightedBackgroundColor];
}

- (void)processTouchUp:(id)sender
{
    super.backgroundColor = [self normalBackgroundColor];
}

@end