For example
I have a custom UIView Class, on the view I put a UIButton.
In the View Class
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesBegan:touches withEvent:event];
NSLog(#"touch view");
}
But when I touch the button, it intercepted view touch message. Is there a way to recieve touches when user touch view's subview?
I noticed when using UIGestureRecognizer bind to the superview, the event can recieved when user touched subview.
There is no (Apple-allowed or stable) way to "pass" touches to another view. Instead, call a method in your other view from your touches method.
Related
I have an OpenGL View with sprites in it which have UIViews with the same position and size on top of the OpenGL view, to make them accessible. The OpenGL View should be able to receive touch events and the UIView on top too. In my UIView class I override the hitTest:withEvent method so the UIViews get the touch input, otherwise only the OpenGL gets the touch:
-(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
NSEnumerator *reverseE = [self.subviews reverseObjectEnumerator];
UIView *iSubView;
while ((iSubView = [reverseE nextObject]))
{
UIView *viewWasHit = [iSubView hitTest:[self convertPoint:point toView:iSubView] withEvent:event];
if (viewWasHit)
{
return viewWasHit;
}
}
return [super hitTest:point withEvent:event];
}
Now my UIViews receive touch-input but the OpenGL elements underneath don't. How can I change that so both of them receive the touch.
In my opinion in such cases it is best if only your main view receives touches in which you then check if any of the subviews was touched using CGRectContainsPoint for instance. If you really want to override the subviews then I suggest you override the touch methods to call the superview touch methods, for instance to override touchesBegin:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[self.superview touchesBegan:touches withEvent:event];
//do additional stuff
}
This will work with touches but probably not with gestures since they cancel touch events and have a different pipeline.
I have a transparent UIView on top of a UIScrollView. The UIView determines whether the scrollview is allowed to scroll or not by checking three touchesMoved events. After the events, I want the view to disable user interaction so scrolling will happen. The user shouldn't even notice the delay.
However, having set the view's userInteractionEnabled to NO, it keeps claiming all touchesMoved events until it is released. This means that the user is forced to let go of the view before being able to scroll.
Using hitTest won't work until the view has been released as well. hitTest does not get called while moving.
I would send the touch events to the UIScrollView, but it happily ignores those due to it having its own hidden touch handling.
Any way to make the UIView stop claiming touch events without having to let go of it?
Make the UIView hidden. According to the docs:
A hidden view disappears visually from its window and does not receive input events
See the class reference for more: http://developer.apple.com/library/ios/#documentation/uikit/reference/uiview_class/uiview/uiview.html
try cancelling the touches:
How to cancel a sequence of UITouch events?
p.s. if necessary I assume you are propagating the touches to next responder:
- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent *)event {
[super touchesBegan:touches withEvent:event];
[[self nextResponder] touchesBegan:touches withEvent:event];
}
- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent *)event {
[super touchesMoved:touches withEvent:event];
[[self nextResponder] touchesMoved:touches withEvent:event];
}
- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent *)event {
[super touchesEnded:touches withEvent:event];
[[self nextResponder] touchesEnded:touches withEvent:event];
}
Say I have a UITableview.
If user click on a table cell the cell is selected.
The same way I have MKMapView. If a user select an annotation than the annotation is selected.
Now I want to arrange that something happened when I click an empty part of the cell.
So I add a tap gesture.
But then when I click, the non empty part of the cell, like the table, and stuff, the cell and mapview don't get selected again.
Only the gesture selector get called.
After the gesture selector is called I want to "pass" the tab back to table cell and mkmapview. How would I do so?
Call your code in the touchesEnded method of your subclass and then call touchesEnded on the superclass, or called it on a specific view object:
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[self someMethod];
[super touchesEnded:touches withEvent:event];
}
OR
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[self someMethod];
[mapView touchesEnded:touches withEvent:event];
}
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(#" touches ");
}
The above method is not calling in my apps. My application description is as under.
I have a MainViewController which loads a ContentViewController in it. ContentViewController has a webview which loads a pdf file.
How to listen the tap of MainViewController's View.
Regards.
I may be not 100% accurate here, but if you place -touchesBegan:withEvent: in your view controller (or its main view) then you will get only those touches that have not been handled by some subviews in the view hierarchy. To intercept all touches you should use UIView subclass for your controller view and override hitTest:withEvent: method in it:
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
touchedView = [super hitTest:point withEvent:event];
NSSet* touches = [event allTouches];
// handle touches if you need
return touchedView;
}
For more information see Event delivery section in "Event handling guide" for iOS
I'm using a custom UIGestureRecognizer subclass to track gestures on my InfoView class. The InfoView class is a subview of a custom UITableViewCell subclass called InfoCell.
I've added my gesture recognizer to my root view (the parent view of everything else on screen, because the purpose of my custom gesture recognizer is to allow dragging of InfoCell views between tables). Now, everything works as it should except one thing. I'm using the following code in my UIGestureRecognizer subclass to detect touches on the InfoView view:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UIView *touchView = [[touches anyObject] view];
if ([touchView isKindOfClass:[InfoView class]]) {
// Do stuff
}
The problem here is that the touches on the InfoView object are being intercepted, therefore they are not being forwarded to the UITableView which contains the InfoCell, which is the parent view of the InfoView. This means that I can no longer scroll the table view by dragging on the InfoView view, which is an issue because the InfoView covers the entire InfoCell.
Is there any way I can forward the touches onto the table view so that it can scroll? I've tried a bunch of things already:
[super touchesBegan:touches withEvent:event];
[touchView.superview.superview touchesBegan:touches withEvent:event]; (touchView.superview.superview gets a reference to its parent UITableView)
But nothing has worked so far. Also, the cancelsTouchesInView propery of my UIGestureRecognizer is set to NO, so thats not interfering with the touches.
Help is appreciated. Thanks!
Check out the UIGestureRecognizerDelegate method: - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
If this returns YES it will prevent your gesture recognizer from stomping on the one that UIScrollView is using to detect scrolling.
UIGestureRecognizer has a property "cancelsTouchesInView" which is set to YES by default. This means that touches in a UIView are cancelled when a gesture is recognized. Try to set it to NO to allow the UIScrollView to receive further touch events.
I had a line in my touchesBegan method that set the state property of the gesture recognizer to UIGestureRecognizerStateBegan. Removing this line seems to fix the problem.
You can try add this notification
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
if ([gestureRecognizer class] == [UIPanGestureRecognizer class]) {
UIPanGestureRecognizer *panGestureRec = (UIPanGestureRecognizer *)gestureRecognizer;
CGPoint point = [panGestureRec velocityInView:self];
if (fabsf(point.x) > fabsf(point.y) ) {
return YES;
}
}
return NO;
}