UIView subclass that draws an inner shadow in a rounded rectangle

InnerShadowView.h

// For an explanation of this code, see:
//  http://stackoverflow.com/questions/13595284/cgcontextcliptomask-not-clipping

#import <UIKit/UIKit.h>

@interface InnerShadowView : UIView

@property (nonatomic, strong) UIColor *fillColor;
@property (nonatomic) CGFloat cornerRadius;
@property (nonatomic, strong) UIColor *shadowColor;
@property (nonatomic) CGSize shadowOffset;
@property (nonatomic) CGFloat shadowBlur;

@end

InnerShadowView.m

#import "InnerShadowView.h"

@implementation InnerShadowView

- (UIViewContentMode)contentMode {
    return UIViewContentModeRedraw;
}

- (void)setFillColor:(UIColor *)fillColor {
    _fillColor = fillColor;
    [self setNeedsDisplay];
}

- (void)setCornerRadius:(CGFloat)cornerRadius {
    _cornerRadius = cornerRadius;
    [self setNeedsDisplay];
}

- (void)setShadowBlur:(CGFloat)shadowBlur {
    _shadowBlur = shadowBlur;
    [self setNeedsDisplay];
}

- (void)setShadowColor:(UIColor *)shadowColor {
    _shadowColor = shadowColor;
    [self setNeedsDisplay];
}

- (void)setShadowOffset:(CGSize)shadowOffset {
    _shadowOffset = shadowOffset;
    [self setNeedsDisplay];
}

- (void)drawRect:(CGRect)rect {
    [self fillIfNeeded];
    [self drawShadowIfNeeded];
}

- (void)fillIfNeeded {
    UIColor *color = self.fillColor;
    if (!color)
        return;

    [color setFill];
    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:self.bounds
        cornerRadius:self.cornerRadius];
    [path fill];
}

- (void)drawShadowIfNeeded {
    UIColor *color = self.shadowColor;
    if (!color)
        return;

    CGContextRef gc = UIGraphicsGetCurrentContext();
    CGContextSaveGState(gc); {
        [[UIBezierPath bezierPathWithRoundedRect:self.bounds
            cornerRadius:self.cornerRadius] addClip];

        UIBezierPath *invertedPath = [UIBezierPath bezierPathWithRect:CGRectInfinite];
        [invertedPath appendPath:[UIBezierPath bezierPathWithRoundedRect:
            CGRectInset(self.bounds, -1, -1) cornerRadius:self.cornerRadius]];
        invertedPath.usesEvenOddFillRule = YES;

        CGContextSetShadowWithColor(UIGraphicsGetCurrentContext(),
            self.shadowOffset, self.shadowBlur, color.CGColor);
        [[UIColor blackColor] setFill];
        [invertedPath fill];

    } CGContextRestoreGState(gc);
}

@end

ViewController.m

#import "ViewController.h"
#import "InnerShadowView.h"

@interface ViewController ()

@end

@implementation ViewController {
    IBOutlet InnerShadowView *innerShadowView_;
    IBOutlet UISlider *cornerRadiusSlider_;
    IBOutlet UISlider *shadowBlurSlider_;
    IBOutlet UISlider *shadowXOffsetSlider_;
    IBOutlet UISlider *shadowYOffsetSlider_;
    IBOutlet UISlider *shadowAlphaSlider_;
}

- (void)viewDidLoad {
    innerShadowView_.fillColor = [UIColor whiteColor];
    [self updateInnerShadowViewPropertiesFromControls];
}

- (IBAction)controlDidChange {
    [self updateInnerShadowViewPropertiesFromControls];
}

- (void)updateInnerShadowViewPropertiesFromControls {
    innerShadowView_.cornerRadius = cornerRadiusSlider_.value;
    innerShadowView_.shadowBlur = shadowBlurSlider_.value;
    innerShadowView_.shadowOffset = CGSizeMake(shadowXOffsetSlider_.value, shadowYOffsetSlider_.value);
    innerShadowView_.shadowColor = [UIColor colorWithRed:1 green:0 blue:0 alpha:shadowAlphaSlider_.value];
}

@end

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