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    <p>here is my implementation by modifying this apple tutorial:</p> <p><a href="https://developer.apple.com/library/ios/samplecode/quartzdemo/Listings/QuartzDemo_QuartzCurves_m.html" rel="noreferrer">https://developer.apple.com/library/ios/samplecode/quartzdemo/Listings/QuartzDemo_QuartzCurves_m.html</a></p> <pre><code>- (void)drawRect:(CGRect)rect { CGContextRef context=UIGraphicsGetCurrentContext(); CGContextSetLineWidth(context, .5f); CGContextSetStrokeColorWithColor(context, [UIColor lightGrayColor].CGColor); CGContextSetRGBFillColor(context, 1, 1, 1, 1); rect.origin.y++; CGFloat radius = cornerRadius; CGFloat minx = CGRectGetMinX(rect), midx = CGRectGetMidX(rect), maxx = CGRectGetMaxX(rect); CGFloat miny = CGRectGetMinY(rect), midy = CGRectGetMidY(rect), maxy = CGRectGetMaxY(rect); CGMutablePathRef outlinePath = CGPathCreateMutable(); if (![User isCurrentUser:message.user]) { minx += 5; CGPathMoveToPoint(outlinePath, nil, midx, miny); CGPathAddArcToPoint(outlinePath, nil, maxx, miny, maxx, midy, radius); CGPathAddArcToPoint(outlinePath, nil, maxx, maxy, midx, maxy, radius); CGPathAddArcToPoint(outlinePath, nil, minx, maxy, minx, midy, radius); CGPathAddLineToPoint(outlinePath, nil, minx, miny + 20); CGPathAddLineToPoint(outlinePath, nil, minx - 5, miny + 15); CGPathAddLineToPoint(outlinePath, nil, minx, miny + 10); CGPathAddArcToPoint(outlinePath, nil, minx, miny, midx, miny, radius); CGPathCloseSubpath(outlinePath); CGContextSetShadowWithColor(context, CGSizeMake(0,1), 1, [UIColor lightGrayColor].CGColor); CGContextAddPath(context, outlinePath); CGContextFillPath(context); CGContextAddPath(context, outlinePath); CGContextClip(context); CGPoint start = CGPointMake(rect.origin.x, rect.origin.y); CGPoint end = CGPointMake(rect.origin.x, rect.size.height); CGContextDrawLinearGradient(context, [self normalGradient], start, end, 0); } else { maxx-=5; CGPathMoveToPoint(outlinePath, nil, midx, miny); CGPathAddArcToPoint(outlinePath, nil, minx, miny, minx, midy, radius); CGPathAddArcToPoint(outlinePath, nil, minx, maxy, midx, maxy, radius); CGPathAddArcToPoint(outlinePath, nil, maxx, maxy, maxx, midy, radius); CGPathAddLineToPoint(outlinePath, nil, maxx, miny + 20); CGPathAddLineToPoint(outlinePath, nil, maxx + 5, miny + 15); CGPathAddLineToPoint(outlinePath, nil, maxx, miny + 10); CGPathAddArcToPoint(outlinePath, nil, maxx, miny, midx, miny, radius); CGPathCloseSubpath(outlinePath); CGContextSetShadowWithColor(context, CGSizeMake(0,1), 1, [UIColor lightGrayColor].CGColor); CGContextAddPath(context, outlinePath); CGContextFillPath(context); CGContextAddPath(context, outlinePath); CGContextClip(context); CGPoint start = CGPointMake(rect.origin.x, rect.origin.y); CGPoint end = CGPointMake(rect.origin.x, rect.size.height); CGContextDrawLinearGradient(context, [self greenGradient], start, end, 0); } CGContextDrawPath(context, kCGPathFillStroke); } - (CGGradientRef)normalGradient { NSMutableArray *normalGradientLocations = [NSMutableArray arrayWithObjects: [NSNumber numberWithFloat:0.0f], [NSNumber numberWithFloat:1.0f], nil]; NSMutableArray *colors = [NSMutableArray arrayWithCapacity:2]; UIColor *color = [UIColor whiteColor]; [colors addObject:(id)[color CGColor]]; color = [StyleView lightColorFromColor:[UIColor cloudsColor]]; [colors addObject:(id)[color CGColor]]; NSMutableArray *normalGradientColors = colors; int locCount = [normalGradientLocations count]; CGFloat locations[locCount]; for (int i = 0; i &lt; [normalGradientLocations count]; i++) { NSNumber *location = [normalGradientLocations objectAtIndex:i]; locations[i] = [location floatValue]; } CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB(); CGGradientRef normalGradient = CGGradientCreateWithColors(space, (__bridge CFArrayRef)normalGradientColors, locations); CGColorSpaceRelease(space); return normalGradient; } </code></pre> <p>Which results in this... <img src="https://i.stack.imgur.com/Y3RJq.png" alt="enter image description here"></p>
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