从系统相册选择照片时，没有选框，相册无选框

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (navigationController.viewControllers.count != 3) return;

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

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

    plCropOverlay.hidden = YES;

    int position = 0;

    position = (screenHeight == 568) ? 124 : 80;

    CAShapeLayer *circleLayer = [CAShapeLayer layer];

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

    [circleLayer setPath:[path2 CGPath]];

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

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

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

}