Forward touches to a UIScrollView

Question

I have two view controllers. View controller A has a UIScrollView and presents view controller B. The presentation is interactive and controlled by the sc

Answer 1

Try subclassing the UIScrollView and overriding hitTest:withEvent: so that the UIScrollView picks up touches outside its bounds. Then you get all the nice UIScrollView animations for free. Something like this:

@interface MagicScrollView : UIScrollView
@end

@implementation MagicScrollView

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    // Intercept touches 100pt outside this view's bounds on all sides. Customize this for the touch area you want to intercept
    if (CGRectContainsPoint(CGRectInset(self.bounds, -100, -100), point)) {
        return self;
    }
    return nil;
}

@end

Or in Swift (Thanks Edwin Vermeer!)

class MagicScrollView: UIScrollView {
    override func hitTest(point: CGPoint, withEvent event: UIEvent?) -> UIView? {
        if CGRectContainsPoint(CGRectInset(self.bounds, -100, -100), point) {
            return self
        }
        return nil
    } 
}

You may also need to override pointInside:withEvent: on the UIScrollView's superview, depending on your layout.

See the following question for more info: interaction beyond bounds of uiview