UIImagePickerController editing view circle overlay

Resolved code:

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if ([navigationController.viewControllers count] == 3)
    {
        CGFloat screenHeight = [[UIScreen mainScreen] bounds].size.height;

        UIView *plCropOverlay = [[[viewController.view.subviews objectAtIndex:1]subviews] objectAtIndex:0];

        plCropOverlay.hidden = YES;

        int position = 0;

        if (screenHeight == 568)
        {
            position = 124;
        }
        else
        {
            position = 80;
        }

        CAShapeLayer *circleLayer = [CAShapeLayer layer];

        UIBezierPath *path2 = [UIBezierPath bezierPathWithOvalInRect:
                           CGRectMake(0.0f, position, 320.0f, 320.0f)];
        [path2 setUsesEvenOddFillRule:YES];

        [circleLayer setPath:[path2 CGPath]];

        [circleLayer setFillColor:[[UIColor clearColor] CGColor]];
        UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 320, screenHeight-72) cornerRadius:0];

        [path appendPath:path2];
        [path setUsesEvenOddFillRule:YES];

        CAShapeLayer *fillLayer = [CAShapeLayer layer];
        fillLayer.path = path.CGPath;
        fillLayer.fillRule = kCAFillRuleEvenOdd;
        fillLayer.fillColor = [UIColor blackColor].CGColor;
        fillLayer.opacity = 0.8;
        [viewController.view.layer addSublayer:fillLayer];

        UILabel *moveLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 10, 320, 50)];
        [moveLabel setText:@"Move and Scale"];
        [moveLabel setTextAlignment:NSTextAlignmentCenter];
        [moveLabel setTextColor:[UIColor whiteColor]];

        [viewController.view addSubview:moveLabel];
    }
}

I've changed the code of @aviatorken89 because it wasn't working on iPhone 6/6+ and iPad. Now it should work with any iPhone's screen size and also on iPad! Tested on iOS 7 and iOS 8.

All these methods aren't really reliable because they are based on the Image Picker subviews hierarchy, and of course Apple could change it. I've tried to protect the code as far as I could, in order to prevent possibile crashes on future iOS releases.

I'll try to keep my solution updated on a gist: https://gist.github.com/andreacipriani/74ea67db8f17673f1b8b

Here is the code:

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if ([navigationController.viewControllers count] == 3 && ([[[[navigationController.viewControllers objectAtIndex:2] class] description] isEqualToString:@"PUUIImageViewController"] || [[[[navigationController.viewControllers objectAtIndex:2] class] description] isEqualToString:@"PLUIImageViewController"]))

        [self addCircleOverlayToImagePicker:viewController];
    }
}

-(void)addCircleOverlayToImagePicker:(UIViewController*)viewController
{
    UIColor *circleColor = [UIColor clearColor];
    UIColor *maskColor = [[UIColor blackColor] colorWithAlphaComponent:0.8];

    CGFloat screenHeight = [[UIScreen mainScreen] bounds].size.height;
    CGFloat screenWidth = [[UIScreen mainScreen] bounds].size.width;

    UIView *plCropOverlayCropView; //The default crop overlay view, we wan't to hide it and show our circular one
    UIView *plCropOverlayBottomBar; //On iPhone this is the bar with "cancel" and "choose" buttons, on Ipad it's an Image View with a label saying "Scale and move"

    //Subviews hirearchy is different in iPad/iPhone:
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad){

        plCropOverlayCropView = [viewController.view.subviews objectAtIndex:1];
        plCropOverlayBottomBar = [[[[viewController.view subviews] objectAtIndex:1] subviews] objectAtIndex:1];

        //Protect against iOS changes...
        if (! [[[plCropOverlayCropView class] description] isEqualToString:@"PLCropOverlay"]){
            DLog(@"Warning - Image Picker with circle overlay: PLCropOverlay not found");
            return;
        }
        if (! [[[plCropOverlayBottomBar class] description] isEqualToString:@"UIImageView"]){
            DLog(@"Warning - Image Picker with circle overlay: BottomBar not found");
            return;
        }
    }
    else{
        plCropOverlayCropView = [[[viewController.view.subviews objectAtIndex:1] subviews] firstObject];
        plCropOverlayBottomBar = [[[[viewController.view subviews] objectAtIndex:1] subviews] objectAtIndex:1];

        //Protect against iOS changes...
        if (! [[[plCropOverlayCropView class] description] isEqualToString:@"PLCropOverlayCropView"]){
            DDLogWarn(@"Image Picker with circle overlay: PLCropOverlayCropView not found");
            return;
        }
        if (! [[[plCropOverlayBottomBar class] description] isEqualToString:@"PLCropOverlayBottomBar"]){
            DDLogWarn(@"Image Picker with circle overlay: PLCropOverlayBottomBar not found");
            return;
        }
    }

    //It seems that everything is ok, we found the CropOverlayCropView and the CropOverlayBottomBar

    plCropOverlayCropView.hidden = YES; //Hide default CropView

    CAShapeLayer *circleLayer = [CAShapeLayer layer];
    //Center the circleLayer frame:
    UIBezierPath *circlePath = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0.0f, screenHeight/2 - screenWidth/2, screenWidth, screenWidth)];
    circlePath.usesEvenOddFillRule = YES;
    circleLayer.path = [circlePath CGPath];
    circleLayer.fillColor = circleColor.CGColor;
    //Mask layer frame: it begins on y=0 and ends on y = plCropOverlayBottomBar.origin.y
    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, screenWidth, screenHeight- plCropOverlayBottomBar.frame.size.height) cornerRadius:0];
    [maskPath appendPath:circlePath];
    maskPath.usesEvenOddFillRule = YES;

    CAShapeLayer *maskLayer = [CAShapeLayer layer];
    maskLayer.path = maskPath.CGPath;
    maskLayer.fillRule = kCAFillRuleEvenOdd;
    maskLayer.fillColor = maskColor.CGColor;
    [viewController.view.layer addSublayer:maskLayer];

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone){
        //On iPhone add an hint label on top saying "scale and move" or whatever you want
        UILabel *cropLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 10, screenWidth, 50)];
        [cropLabel setText:@"Scale and move"]; //You should localize it
        [cropLabel setTextAlignment:NSTextAlignmentCenter];
        [cropLabel setTextColor:[UIColor whiteColor]];
        [viewController.view addSubview:cropLabel];
    }
    else{ //On iPad re-add the overlayBottomBar with the label "scale and move" because we set its parent to hidden (it's a subview of PLCropOverlay)
        [viewController.view addSubview:plCropOverlayBottomBar];
    }
}