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];
}
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.
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.
I'm making an UISearchBar option in the navigationbar of my app.
My app consists of multiple views and subviews.
I have this mainview which has 3 other views on himself. one of it is empty (for now) the other 2 have tableviews on them.
I want my keyboard to show when I'm searching and hide when i'm doing the actual search or when i touch/click outside the uisearchbar.
Im using the searchbardelegate as is required.
Im able to hide the keyboard using [searchBar resignFirstResponder] in the following ways.
When im pressing the return key.
When i cancel search manually
When i press any of the keyboard buttons to search or cancel.
When i touch an empty part of the screen using
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches] anyObject];
if ([mySearchBar isFirstResponder] && [touch view] != mySearchBar) {
[mySearchBar resignFirstResponder];
}
[super touchesBegan:touches withEvent:event];
}
What i not seem to be able to do is make it respond to touching one of my 2 tableviews. Or when im refilling the mainview to contain something different entirely.
Ive tried changing the touchesbegan method to resign the searchbar when touching the tableviews but it hasnt worked so far.
I've tried several other things found by my dear friend mr. google, but it all seems to be something other then I need.
Anyone have any ideas of what I might do to fix this problem?
EDIT:
It appears so that, when using breakpoints, touchesbegan-method does respond to the backgroundview but it doesnt respond when i touch either of the tableviews or the navigationbar (containing the uisearchbar).
Solved it!
- (BOOL) searchBarShouldBeginEditing:(UISearchBar *)searchBar
{
[self.myViewController1.customView1 setUserInteractionEnabled:NO];
[self.myViewController2.customView2 setUserInteractionEnabled:NO];
[searchBar setShowsCancelButton:YES animated:[mySettings animation]];
return YES;
}
I started by shutting down the userInteraction on my 2 subviews, at the moment I start using the searchBar.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches] anyObject];
if ([self.mySearchBar isFirstResponder] && [touch view] != self.mySearchBar)
{
[self.mySearchBar resignFirstResponder];
[self.myViewController1.customView1 setUserInteractionEnabled:YES];
[self.myViewController2.customView2 setUserInteractionEnabled:YES];
}
[super touchesBegan:touches withEvent:event];
}
Then when I click/tap/touch outside the searchBar I first resign the keyboard which is first responder still AND AFTER that I set userInteraction back on for the 2 subviews.
The order of doing this is vital!
This piece of code allows u to resign the keyboard in a single mainViewController even when it is crowded with a massload of subviews.
Have you tried this,
UISearchBar *searchBar;
Next set the Getter and Setter Property of UISearchBar.
and call the any method
[searchBar resignFirstResponder];
-(void)touchesBegan :(NSSet *)touches withEvent:(UIEvent *)event
{
[textValue resignFirstResponder];
[super touchesBegan:touches withEvent:event];
}
can someone explain me the meaning of this method???
[textValue resignFirstResponder];
Usually used to hide the keyboard if textValue control has focus at the moment.
[super touchesBegan:touches withEvent:event];
Calls the same method of parent class to preserve standard touch handling.
From the documentation;
Tells the receiver when one or more
fingers touch down in a view or
window.
The primary event-handling methods for
touches are touchesBegan:withEvent:,
touchesMoved:withEvent:,
touchesEnded:withEvent:, and
touchesCancelled:withEvent:. The
parameters of these methods associate
touches with their events, especially
touches that are new or have
changed and thus allow responder
objects to track and handle the
touches as the delivered events
progress through the phases of a
multi-touch sequence.
-(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