IB_DESIGNABLE

@interface FadingView ()

@property (assign, nonatomic) IBInspectable BOOL verticalFade;
@property (assign, nonatomic) IBInspectable BOOL horizontalFade;

@end

@implementation FadingView

- (void)drawRect:(CGRect)rect {
    [super drawRect:rect];

    self.opaque = NO;
    self.backgroundColor = UIColor.clearColor;

    if (!self.layer.mask && (self.verticalFade || self.horizontalFade)) {
        NSArray *colors = @[
                (id) UIColor.clearColor.CGColor,
                (id) UIColor.whiteColor.CGColor,
                (id) UIColor.whiteColor.CGColor,
                (id) UIColor.clearColor.CGColor
        ];

        CAGradientLayer *gradient = [[CAGradientLayer alloc] init];
        gradient.locations = @[@0, @0.05, @0.95, @1];
        gradient.colors = colors;
        gradient.frame = self.bounds;

        if (self.horizontalFade) {
            gradient.frame = self.bounds;
            gradient.startPoint = CGPointZero;
            gradient.endPoint = CGPointMake(1, 0);
        }

        self.layer.mask = gradient;
    }
}

@end