Forward touch event from UIView, to its TableView inside it - ios

Question

I built a SplitView class that looks like this picture below:
As you can see the SplitView always have two subviews, therefore it has two properties that are leftView and rightView.
The job of the SplitView is to manage its subview size proportion.
If I do a swipe gesture to the left, it will move the separator location and it changes the size of each subviews, so it will look like this:
It works perfectly until I use UITableView as the leftView and rightView.
This is because the UITableView inside it is the one which will process the touch event, not the superview (which is SplitView)
And because the code to intercept and respond to the touch is in SplitView, it doesn't do anything if the UITableView inside it is the one that receives the touch event.
To do this I implement hitTest to make the SplitView the responder, not the UITableView inside it.
override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
return self
}
Now I can get the touch event in the SplitView even though the user swipe on the UITableView.
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first {
self.startInfo = StartInfo(timestamp: touch.timestamp,
touchLocation: touch.location(in: self),
separatorLocation: separatorView.frame.origin)
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first, let startInfo = startInfo {
let location = touch.location(in: self)
if moveHorizontally == nil {
let deltaX = abs(location.x - startInfo.touchLocation.x)
let deltaY = abs(location.y - startInfo.touchLocation.y)
if deltaX > 4.0 || deltaY > 4.0 {
moveHorizontally = deltaX > deltaY
}
}
if let moveHorizontally = moveHorizontally {
if moveHorizontally {
print("the user intends to adjust separator position")
adjustSeparatorViewPosition(usingTouchLocation: location)
} else {
print("the user intends to scroll the table view")
if rightView.frame.contains(location) {
rightView.touchesMoved(touches, with: event) // doesn't work
} else {
leftView.touchesMoved(touches, with: event) // doesn't work
}
}
}
}
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
startInfo = nil
moveHorizontally = nil
leftView.touchesEnded(touches, with: event)
guard let touch = touches.first else { return }
if touch.location(in: self).x < self.bounds.width / 2 {
UIView.animate(withDuration: 0.3) {
self.setSeparatorLocationX(to: self.separatorMinX)
}
} else {
UIView.animate(withDuration: 0.3) {
self.setSeparatorLocationX(to: self.separatorMaxX)
}
}
}
override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
startInfo = nil
moveHorizontally = nil
leftView.touchesCancelled(touches, with: event)
}
As you can see in this code, I added a delay, just like UIScrollView does when swiping to get the user intention, whether the user want to scroll horizontally or vertically.
- If the swipe direction is horizontal, I want to adjust the separator location
- If the swipe direction is vertical, I want to forward the event to the UITableView inside it (for example the leftView)
But, forwarding the touch event using rightView.touchesMoved(touches, with: event) doesn't work.
How to forward the touch event from the SplitView to the UITableView inside it?