Cell doesn't receive touch events, when there is UIScrollView inside UITableViewCell. Is there any way to cancel tap events for UIScrollView (needs only to handle scrolling)?
If you need touches to go through, implement a subclass of UIScrollView, and add these:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
// Pass to parent
[super touchesBegan:touches withEvent:event];
[self.nextResponder touchesBegan:touches withEvent:event];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
// Pass to parent
[super touchesEnded:touches withEvent:event];
[self.nextResponder touchesEnded:touches withEvent:event];
}
The cell only interecepts taps, so it'll work.
This is brilliant! I was pulling my hair on this one.
Related
I have a grouped table view with custom cells in it, and it contains many cells (i.e. scrollable), there is a scroll view in every cell (which contains a UILabel), I've set up that scroll view properly (made its content size larger than its frame size for the scroll to work properly and then added it as a sub-view on the custom cell), however, the text on the label that is inside this scroll view appears but not scrollable (no scroll bars, no scrolling ...), the only scrollable object on the screen is the default scroll view of the grouped table view.
how can i get the mini scroll view to scroll properly ?
thank you in advance.
Are you implementing touchesBegan and touchesEnded in your scrollview?
- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent *)event
{
[super touchesBegan:touches withEvent:event];
[[self nextResponder] touchesBegan:touches withEvent:event];
}
- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent *)event
{
[super touchesEnded:touches withEvent:event];
[[self nextResponder] touchesEnded:touches withEvent:event];
}
If not, make a class for your scrollview (scrollview subclass) and implement them therein.
Here's the full code of what should be written in the subclass of the scroll view.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
if (self.dragging) {
[super touchesBegan:touches withEvent:event];
} else {
[self.superview touchesBegan:touches withEvent:event];
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
if (self.dragging) {
[super touchesMoved:touches withEvent:event];
} else {
if ([self.delegate isKindOfClass:[UITableViewCell class]]) {
[(UITableViewCell *)self.delegate touchesCancelled:touches withEvent:event];
}
[self.superview touchesMoved:touches withEvent:event];
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
if (self.dragging) {
[super touchesEnded:touches withEvent:event];
} else {
[self.superview touchesEnded:touches withEvent:event];
}
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
if (self.dragging) {
[super touchesCancelled:touches withEvent:event];
} else {
[self.superview touchesMoved:touches withEvent:event];
}
}
In the touchesMoved there's some extra code based on a bug I was encountering. To start, if your self.delegate is not the UITableViewCell, than replace that property with a property to your cell.
The cell needs to retrieve the cancel touch event during movement to prevent the undesired results. It can be easily reproducible as follows.
Highlight the cell (assuming the scroll view is over the whole cell, if not highlight the scroll view)
While the cell is highlighted, drag the table view
Select any other cell and now the previously highlighted cell will retrieve the didSelectCell state
Another point to mention is that order matters! If the self.delegate is not called before the self.superview then the highlighted state wont happen.
I've created a subclass of UIScrollView to implement a one of my custom controls, at this point everything is working great.
However what I'd like to be able to call a methods whenever a Touch Up Inside event is detected (just like interface builder) does anybody know how I could do this?
Because UIScrollView does not inherit from UIControl, this is not possible. You can, however, relay the scroll view's touch events by implementing the UIResponder methods in your custom UIScrollView class:
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
if (!self.dragging)
{
[self.nextResponder touchesEnded: touches withEvent:event];
}
[super touchesEnded: touches withEvent: event];
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
if (!self.dragging)
{
[self.nextResponder touchesBegan: touches withEvent:event];
}
[super touchesBegan: touches withEvent: event];
}
now i'm working with cocos2d and i design to add navigationcontroller to my cocos2d application,
so i add navigationcontroller to my application when i click it not pass touch or event to cocos2d
now i'm try to override UINavigationController by
add new new class name is NavigationController and inherit from UINavigationController
in init i call [super init];
every things look be ok
but when i try to add
- (BOOL)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(#"Im overriding touch");
return YES;
}
- (BOOL)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(#"Im overriding touchMove");
return YES;
}
it not call
Why are you calling the methods ccTouchesBegan:withEvent: and ccTouchesMoved:withEvent: instead of the original names? You don't have to change the names of the methods when you subclass UINavigationController; instead, you should keep the same names and call super on them as well as appropriate. For example:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(#"I'm overriding touch");
[super touchesBegan:touches withEvent:event];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(#"I'm overriding move");
[super touchesMoved:touches withEvent:event];
}
I have a UIScrollView that contains a UITextView (not editable).
I can't make the UIScrollView gets the touch events, UITextView seems to get them and keep them . Any idea how to let UIScrollView gets the touch events?
I want UITextView to still be scrollable vertically (my UIScrollView is scrollable only horizontally).
In your UITextView subclass, do this:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[self.nextResponder touchesBegan:touches withEvent:event];
}
If you want UITextView to handle the touches too, then I believe you can do this:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[self.nextResponder touchesBegan:touches withEvent:event];
[super touchesBegan:touches withEvent:event];
}
but it might result in really weird behavior.
I have several UIButtons which I use to set the current action when tapping in the main area. I would also like to allow the user to drag from the button directly into the main area and take the same action; essentially, the touchesBegan and touchesMoved should be passed on to the main view when touching the UIButtons, but also should send the button press action.
Right now, I have the touch up inside changing the control. The drag exit calls the touch up inside section to set the control, then calls the touches began section to start the main area touching operation.
However, at this point, the touchesMoved and touchesEnded are obviously not being called, because the touches originated on the UIButton.
Is there a way to half-ignore the touches so they're passed to the main area, but also allow me to set the control first?
I know this question is two years old (and already answered), but nevertheless...
When I tried this myself, the touches were forwarded, but the buttons no longer behaved like buttons. I also passed the touches along to "super" and now all is well.
So, for beginners that might stumble upon this, this is what the code should look like:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesBegan:touches withEvent:event];
[self.nextResponder touchesBegan:touches withEvent:event];
}
In the documentation, look for Responder Objects and the Responder Chain
You can "share" touches between objects by forwarding the touch up the responder chain.
Your UIButton has a responder/controller that receives the UITouch events, my guess is that once it has preformed its interpretation of the message it returns - the touch has been handled and disposed of.
Apple suggests something like this (based on the type of touch of course):
[self.nextResponder touchesBegan:touches withEvent:event];
Rather than disposing of the touch event it is passed on.
Sub classed UIButton:
MyButton.h
#import <Foundation/Foundation.h>
#interface MyButton : UIButton {
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event ;
#end
MyButton.m
#import "MyButton.h"
#implementation MyButton
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
printf("MyButton touch Began\n");
[self.nextResponder touchesBegan:touches withEvent:event];
}
#end
No need to subclass either! Simply stick this on the top of your implementation before anything else:
#pragma mark PassTouch
#interface UIButton (PassTouch)
#end
#implementation UIButton (PassTouch)
- (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];
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesCancelled:touches withEvent:event];
[self.nextResponder touchesCancelled:touches withEvent:event];
}
#end