in my viewController I have an imageSlider which is above a UITableView.
I want to forward vertical swipeGesture from imageSlider to the underlying tableview. so when I swipe vertically on imageSlider, underlying tableView begins to scrolling. (tableview can scroll below imageSlider)
what I did:
I have created a custom view for my viewController View and have override hitTest:WithEvent: method:
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
UIView *targetView = self.flexibleHeader;
// Convert the point to the target view's coordinate system.
// The target view isn't necessarily the immediate subview
CGPoint pointForTargetView = [targetView convertPoint:point fromView:self];
if (CGRectContainsPoint(targetView.bounds, pointForTargetView)) {
// The target view may have its view hierarchy,
// so call its hitTest method to return the right hit-test view
UIView *finalView = [targetView hitTest:pointForTargetView withEvent:event];
//final view should be UIButton or other UIControl element in RestaurantFlexibleHeader view
if (![finalView isKindOfClass:[targetView class]]) {
return finalView;
}
}
return [super hitTest:point withEvent:event];
}
but the problem is that I can't detect swipe gesture from UIEvent. because allTouches property is empty!
I can put imageSlider below tableView, so When I start to scroll vertically on imageSlider tableView begins to start scrolling. but how can I forward horizontal swipe and tap event to imageSlider?
so whats your idea? how do you handle this dilemma?
Related
I have next structure
UView -
- UIView2 with Button
- CollectionView - which overlap UIView2 and has contentInset
I can't make to Button receive touch events.
I try pointInside with check clear color (collectionView has backgroundColor is set to clear color)
But i need to scroll work event on blue part (UIView2)
So, i need then i touch collectionView touch also receive a UIButton
Is it possible?
Why does your collection view need to overlap the button? Anyway, you can try overriding HitTest in UIView like this:
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
CGPoint pointInUIView2 = [UIView2 convertPoint:point fromView:self];
if ([UIView2 pointInside:pointInUIView2 withEvent:event])
{
return UIView2;
}
else
{
return [super hitTest:point withEvent:event];
}
}
I have a view with a subview. When a button in the subview is tapped, the subview expands outside the bounds of a view, presenting couple of other buttons. However, I cannot find a way to interact with them.
I found a code at Apple's site:
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
// Convert the point to the target view's coordinate system.
// The target view isn't necessarily the immediate subview
CGPoint pointForTargetView = [self.targetView convertPoint:point fromView:self];
if (CGRectContainsPoint(self.targetView.bounds, pointForTargetView)) {
// The target view may have its view hierarchy,
// so call its hitTest method to return the right hit-test view
return [self.targetView hitTest:pointForTargetView withEvent:event];
}
return [super hitTest:point withEvent:event];
}
However, I cannot understand how should I use it, so that my subview will recognize the touches.
Any help would be greately appreciated.
You need to subclass the UIView or which ever class you need and override that method. Then create an object of that subclass and use it. It will then recognize the touches.
I have a MainViewController(A) and another DetailedViewController(B) as its subview. In "B" I have a UIView containing some UIControls like a UIButton, UILabel and some UIViews.
I need to ignore all the touch events within this UIView except for Button clicks and I have to remove the subView if clicked outside the UIView.
How can I accomplish this ?
A option might be to set a custom view in the detail view controller.
In that view you can override the hittest function.
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
UIView *resultView = [super hitTest:point withEvent:event];
if (![resultView isKindClass:[UIButton class]])
{
resultView = nil;
}
return resultView;
}
Touches not on the buttons will than be ignored. But if you have a scroll view under it and you will start dragging on the buttons the scrollview will be ignored.
I can't figure out why this is happening, but I have a subclass of UIView that is added to my view controller's view.
productView = [[SKUProductView alloc]initWithFrame:CGRectMake(60,768, 700, 550)];
[self.view addSubview:productView];
The view starts offscreen and will animate onscreen on a pan gesture event.While the view is offscreen, it is receiving touch events outside its own frame. I have developed a work around by overriding the hitTest method in the subview to return a hitTest call to the superview if the touch event is outside its frame.
-(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
//Test to determine if view is offscreen or if touch is outside its frame
if (self.frame.origin.y >= 768 || point.x > self.frame.size.width)
{
return [super hitTest:point withEvent:event];
}
else if (point.y < kSKU_SCROLLVIEW_Y_OFFSET)
{
return [_productTabBar hitTest:point withEvent:event];
}
return _productScrollView;
}
but I'm wondering why would my subview receive touch events outside its own frame in the first place?
Why not using
CGRectContainsPoint(rect, point);
to determine if the touch point is inside the frame of view ?
To be sure, print on console the view frame with NSStringFromCGRect() function so you can understand what's happening.
I'm building an iOS app that has a custom UIView upon a UIScrollView which in turn has a subview.
Here's the layout structure:
Note that the custom UIView(called "Detected Object Hint View") is not a subview of ScrollView, it's a sibling view of UIScrollView. And I want to respond to tap gesture on the custom UIView, so I've added UITapGestureRecognizer to the UIView, and it works for tap, but the UIScrollView will never get any touch events (not responding to scroll or zoom gesture).
I've googled a while, and a lot of people pointed out that in order for other view to respond to the touch events, I should implement the following method:
- (id)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
UIView *hitView = [super hitTest:point withEvent:event];
if (hitView == self){
return nil;
}
else {
return hitView;
}
}
But once I've added this method to my custom UIView, it will not respond to tap gesture either (of course).
So I'm wondering how can I handle the tap gesture on my custom UIView and pass the touch events to UIScrollView as well?
Big thanks!