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    <p>You can do this by creating a subclass of <code>UIView</code> that is semi-transparent in the overflow region and transparent in the "crop" region and placing it over your <code>UIScrollView</code> and extending it out to cover the overflow.</p> <p>The main methods you need to implement are <code>initWithFrame</code>:</p> <pre><code>#define kIDZAlphaOverlayDefaultAlpha 0.75 - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { mAlpha = kIDZAlphaOverlayDefaultAlpha; self.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:mAlpha]; self.userInteractionEnabled = NO; } return self; } </code></pre> <p>Don't miss out the <code>userInteractionEnabled = NO</code> otherwise the scroll view will not sees events.</p> <p>and <code>drawRect</code></p> <pre><code>- (void)drawRect:(CGRect)rect { CGRect apertureRect = /* your crop rect */; CGContextRef context = UIGraphicsGetCurrentContext(); /* draw the transparent rect */ CGContextSetRGBFillColor(context, 0.0, 0.0, 0.0, 0.0); CGContextSetBlendMode(context, kCGBlendModeCopy); CGContextFillRect(context, apertureRect); /* draw a white border */ CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0); CGContextStrokeRect(context, apertureRect); } </code></pre> <p>The important point here is the <code>kCGBlendModeCopy</code> this allows us to draw (or cut) a transparent rectangle in a semi-transparent background.</p> <p>If you want to can make the transparent rectangle a rounded rectangle, and include a preview of the cropped image and end up with something like the screen below:</p> <p><img src="https://i.stack.imgur.com/GLLdB.png" alt="Screenshot of IDZAlphaOverlay in action"></p> <p>Sorry I can't share all the code for the screen shot. It's from a client project :-(</p>
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    1. POHow do you darken UIScrollView's overflow?
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    1. COThanks for your reply!!.
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      1. USJorge Leandro Perez
    2. COI notice you did not accept this as an answer. Were you unable to get it to work? Do you need more assistance?
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    3. COThanks for the follow up!. I couldn't build it, since the method 'CGContextFrameRect' seems to be missing. I ended up solving this by means of Core Graphics (CGContextFillRect). I've added a custom overlay view, and i've used the CALayer of that view as a mask in the ImageView CALayer. (That's the reason why i didn't click the accept, sorry about that, and thanks again!)
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      1. USJorge Leandro Perez
 

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