I have this snippet of code in the viewDidLoad of my ViewController
UILongPressGestureRecognizer* gestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(_handleLongPress:)];
gestureRecognizer.numberOfTouchesRequired = 1;
gestureRecognizer.minimumPressDuration = 5.0;
gestureRecognizer.delegate = self;
[self.view addGestureRecognizer:gestureRecognizer];
NSLog(#"Gesture recognizers = %#",self.view.gestureRecognizers);
and the methods
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
return YES;
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
return YES;
}
- (void) _handleLongPress:(UIGestureRecognizer *)sender
{
if (sender.state == UIGestureRecognizerStateBegan)
NSLog(#"Started");
}
When I run this app and click on the view for 5 seconds the _handleLongPress gets trigger, however when I run the same app on the device it never hits the _handleLongPress method.. what am I missing? I do see the output that there is the long press :
2014-08-01 10:00:48.505 TestConsole[1343:60b] Gesture recognizers = (
"UILongPressGestureRecognizer: 0x14644d30; state = Possible; view = UIView 0x1453f950>; target= <(action= _handleLongPress:, target=MyViewController 0x1463a730>)>"
I put breakpoints at gestureRecognizer:shouldReceiveTouch: and it does hit that the UILongPressGestureRecognizer.. I am dumbfounded!
Related
Swipe to Delete is not working properly in a Tableview. In viewDidLoad I have following code.
for (UIGestureRecognizer *gesture in _addressTblView.gestureRecognizers) {
if ([gesture isKindOfClass:[UIPanGestureRecognizer class]])
gesture.cancelsTouchesInView = YES;
gesture.delaysTouchesBegan = YES;
}
and I have implemented UIGestureRecognizer methods in my View Controller.
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
return YES;
}
// For smooth swipe to delete in UITableView Cell, because Pan Gesture of Side Menu also competes.
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
EKLog(#"gesture recognizer 1 %#", gestureRecognizer);
EKLog(#"gesture recognizer 2 %#", otherGestureRecognizer);
return YES;
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
return YES;
}
Whenever swipe to delete is performed one gesture succeeds and other fails.
**gesture recognizer 1** <UIScrollViewPanGestureRecognizer: 0x1022a2ed0; state = Ended; delaysTouchesBegan = YES; delaysTouchesEnded = NO; view = <UITableView 0x10292e800>; target= <(action=handlePan:, target=<UITableView 0x10292e800>)>>
**gesture recognizer 2** <UIScrollViewPanGestureRecognizer: 0x1022a8bc0; state = Failed; cancelsTouchesInView = NO; delaysTouchesEnded = NO; view = <UITableViewWrapperView 0x102965000>; targets= <(
"(action=handlePan:, target=<UITableViewWrapperView 0x102965000>)",
"(action=handleSwipeBeginning:, target=<UITableViewWrapperView 0x102965000>)"
)>>
As seen in debug console, two gesture recognizer are competing for each other. Sometimes swipe to delete works and sometimes it doesnt. Please help. Thanks.
Following is the code I have written to put 2 finger swipe on UITableView :
UISwipeGestureRecognizer *leftSwipe = [UISwipeGestureRecognizer new];
[leftSwipe addTarget:self action:#selector(nextDay)];
leftSwipe.numberOfTouchesRequired = 2;
leftSwipe.direction = UISwipeGestureRecognizerDirectionLeft;
leftSwipe.delegate = self;
[leftSwipe setCancelsTouchesInView:YES];
[tableViewTasks addGestureRecognizer:leftSwipe];
UISwipeGestureRecognizer *rightSwipe = [UISwipeGestureRecognizer new];
[rightSwipe addTarget:self action:#selector(previousDay)];
rightSwipe.numberOfTouchesRequired = 2;
rightSwipe.direction = UISwipeGestureRecognizerDirectionRight;
rightSwipe.delegate = self;
[rightSwipe setCancelsTouchesInView:YES];
[tableViewTasks addGestureRecognizer:rightSwipe];
I am using SWTableViewCell which has left and right (single tap) gestureRecognisers.
When UITableView is swiped left/right using 2 fingers, SWTableViewCell left and right gestures are also fired after that.
How to stop the conflict ?
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
if (SWTableViewCellTouch) {
SWTableViewCellTouch = NO
return NO;
}
return YES;
}
when you touch the SWTableViewCell set a BOOL SWTableViewCellTouch to YES.
The possible solution is enable/disable the BOOl (SWTableViewCellTouch) in the touchesBegan: method as below.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
if ([[event touchesForView:self] count] > 1) {
// Its two finger touch so set the BOOL false like
SWTableViewCellTouch = NO;
}
else if ([[event touchesForView:self] count] == 1){
// Its sigle finger touch so set the BOOL true like
SWTableViewCellTouch = YES;
}
[super touchesBegan:touches withEvent:event] ;}
Hope this will help you.
1. Implement UIGestureRecognizerDelegate in your UIViewController
2. Set leftSwipe.delegate = self; and leftSwipe.delegate = self;
3. Now check if the in its Delegate Method if UISwipeGesture have how many numberOfTouchesRequired
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
if ( [gestureRecognizer isMemberOfClass:[UISwipeGestureRecognizer class]] ) {
UISwipeGestureRecognizer *swipeGesture=(UISwipeGestureRecognizer *)gestureRecognizer ;
if(swipeGesture.numberOfTouchesRequired!=2)
{
//if Double not Double Swipe Touch Don't Linsten Gesture in your Viewcontroller
return NO;
}
}
return YES;
}
i hope this will solve your problem
Here is the code:
This section is written on **-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath**
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(imageDispalyFullScreenTapped:)];
singleTap.numberOfTapsRequired = 1;
singleTap.delegate=self;
cell.imgDisplay.userInteractionEnabled = YES;
[cell.imgDisplay addGestureRecognizer:singleTap];
Next I have implemented the delegate, i.e. **UIGestureRecognizerDelegate**
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
return YES;
}
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
return YES;
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
return YES;
}
Now implemented the selector when UIImageView getting tapped
-(void)imageDispalyFullScreenTapped:(UITapGestureRecognizer*)gesture
{
UIView *tappedView = gesture.view;
UITableViewCell *cell=[self getSuperViewOfType:[UITableViewCell class] FromView:tappedView];
NSIndexPath *indexPath=[tblChat indexPathForCell:cell];
Sock_ModelChat *objChat=[arrDisplay objectAtIndex:indexPath.row];
if ([objChat.strUrlLocal stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]].length>0) {
imgSelectedDisplay=[[Sock_DB sharedInstance] getImageForName:objChat.strUrlLocal];
ImageDisplayerViewController *imageDisplayer=[ImageDisplayerViewController sharedInstance];
imageDisplayer.delegate=self;
[self addChildViewController:imageDisplayer];
imageDisplayer.view.frame=CGRectMake(0, 0, CGRectGetWidth([UIScreen mainScreen].bounds), CGRectGetHeight([UIScreen mainScreen].bounds));
[self.view addSubview:imageDisplayer.view];
[imageDisplayer didMoveToParentViewController:self];
}
}
But the problem is whenever tapping on the border side or edge side of the image view, the tap on image view getting detected and the selector imageDispalyFullScreenTapped fired.But when tapping on the center or near the center, tap is not getting detected and so the related selctor also not firing.
I am working on XCode Version 8.0 (8A218a) and iOS 10.0.
May be UserInteraction is disabled in your case
then you can add gesture like :
let gesture:UITapGestureRecognizer = UITapGestureRecognizer.init(target:self, action:#selector(handleTap))
gesture.numberOfTapsRequired = 1
gesture.delegate = self
cell.imageView?.addGestureRecognizer(gesture)
then add below function in your viewcontroller
func handleTap(sender: UITapGestureRecognizer? = nil) {}
i am creating drawer
self.isShowMenuVC = NO;
_menuView = [MenuViewController viewController];
[self.menuView setDelegate:self];
[self addChildViewController:self.menuView];
[self.menuView.view setFrame:CGRectMake(-kMenuTableWidth, 0, kMenuTableWidth, self.view.frame.size.height)];
[self.view addSubview:self.menuView.view];
[self.menuView didMoveToParentViewController:self];
UITapGestureRecognizer *outsideTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(outsideTapped:)];
[self.view addGestureRecognizer:outsideTap];
outsideTap.delegate = self;
and when button tap i just set frame of _menuView.view to behave like a drawer
what i want is to detect touch outside of drawer but i am not able to do it
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
if (touch.view == self.menuView.view) {
NSLog(#"Touch Drawer");
} else {
NSLog(#"Touch Outside");
}
return YES;
}
but it is always show Touch Outside"
i am missing something but don't know what thanks in advance
Also try with 2 gesture but not working because one gesture in self.view so, when i tap in drawer method call 2 times.
for that i tried to disable one gesture, still calling two times
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
if (gestureRecognizer == self.touchInDrawer) {
NSLog(#"Touch in drawer");
[self.touchOutSideDrawer setEnabled:NO];
} else {
NSLog(#"Outside");
[self hideMenuView];
}
return YES;
}
The UITapGestureRecognizer cannot detect the touch outside the view which it belongs to.
You need to create another UITapGestureRecognizer and add them to self.menuView.view.
Also you can make two #property for your gesture recognizers and check them inside method:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
if (gestureRecognizer == self.firstGesture) {
NSLog(#"Touch in first gesture");
} else {
NSLog(#"Touch in another gesture");
}
I have solve this issue with adding two gesture
#property (strong,nonatomic) UITapGestureRecognizer *touchInDrawer;
#property (strong,nonatomic) UITapGestureRecognizer *touchOutSideDrawer;
as per #Eugene Zaychenko's Answer but there is still problem because delegate method calling two times
also i can't [self.touchOutSideDrawer setEnabled:NO]; when touch in drawer tapped, because after that it will remove from the view and never executed again if [self.touchOutSideDrawer setEnabled:YES];
but most interesting thing is
_touchInDrawer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(outsideTapped:)];
[self.menuView.view addGestureRecognizer:self.touchInDrawer];
self.touchInDrawer.delegate = self;
_touchOutSideDrawer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(outsideTapped:)];
[self.view addGestureRecognizer:self.touchOutSideDrawer];
self.touchOutSideDrawer.delegate = self;
outsideTapped method calling only one time so i shifted my all code there and is working
- (void) outsideTapped:(UITapGestureRecognizer *)gestureRecognizer {
if (gestureRecognizer == self.touchOutSideDrawer) {
// [self.view removeGestureRecognizer:self.touchOutSideDrawer];
[self hideMenuView];
NSLog(#"Outside");
} else {
NSLog(#"Touch in drawer");
// [self.touchOutSideDrawer setEnabled:NO];
}
}
Please help me with the below scenario.
Self.view (Swipe Gesture added here)
UicollectionView Object in subView (Default pan,swipe gestures are there)
Want to disable scrollview scrolling/failCollectionViewPan gesture for 2 finger swipe event
Means collection view will not scroll if 2 finger swipe executed
Another approach can be to disable Collection view scrolling while 2 fingers used. Over here, I want not to swipe collection view on 2 finger swipe.
I have implemented this code, but its slowing down scrolling.
[self.collectionView.panGestureRecognizer shouldBeRequiredToFailByGestureRecognizer:_swipeL];
Then I have implemented below codes
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
return YES;
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
return YES;
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
return YES;
}
Now both, Swipe and Scroll are working together.
Then, I have tried in a below manner, but still not got fixed.
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
if([gestureRecognizer isKindOfClass:[UISwipeGestureRecognizer class]]){
if(gestureRecognizer.numberOfTouches==2){
if( [[otherGestureRecognizer.view class] isSubclassOfClass:[UITableViewCell class]] ||
[NSStringFromClass([otherGestureRecognizer.view class]) isEqualToString:#"UITableViewCellScrollView"] ||
[NSStringFromClass([otherGestureRecognizer.view class]) isEqualToString:#"UITableViewWrapperView"] || [NSStringFromClass([otherGestureRecognizer.view class]) isEqualToString:#"UIScrollViewPanGestureRecognizer"] || [NSStringFromClass([otherGestureRecognizer.view class]) isEqualToString:#"UIScrollViewPagingSwipeGestureRecognizer"])
{
NSLog(#"Allow&Disable %#", [otherGestureRecognizer description]);
[gestureRecognizer requireGestureRecognizerToFail:otherGestureRecognizer];
return NO;
}
}
}
return YES;
}
Also I have implemented below 2 methods to fix it but fails.
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer NS_AVAILABLE_IOS(7_0);
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer NS_AVAILABLE_IOS(7_0);
Its is able to fix for ScrollView with such ways, but the same ways are not working for UICollectionView. Because of, colection view's default pan gesture, it cannot be able to modified. While tring this way, app crashed.
If you want to detect pan gesture, try something like this. But you need to recognise direction of pan gesture:
- (void)viewDidLoad
{
[super viewDidLoad];
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(panGesture:)];
panGesture.delegate = self;
[self.yourCollectionView addGestureRecognizer:panGesture];
}
- (void)panGesture:(UIPanGestureRecognizer *)gesture;
{
if (gesture.numberOfTouches == 2) {
NSLog(#"Two fingers pan gesture");
}
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]
&& gestureRecognizer.numberOfTouches == 2) {
return NO;
}
return YES;
}
Your problem with UISwipeGestureRecognizer is, that it fires later than UIPanGesture, so in the shouldRecognizeSimultaneouslyWithGestureRecognizer delegate call, swipe gesture is always otherGestureRecognizer, and UIPanGesture is always gestureRecognizer, and in this function you can only disable otherGestureRecoginzer...
UPDATE:
Another solution: use another UIPanGestureRecognizer to disable scroll pan gesture:
- (void)viewDidLoad
{
[super viewDidLoad];
UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(swipeGesture:)];
swipeGesture.direction = UISwipeGestureRecognizerDirectionDown;
swipeGesture.delegate = self;
swipeGesture.numberOfTouchesRequired = 2;
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:nil];
panGesture.delegate = self;
[self.tableView addGestureRecognizer:panGesture];
[self.tableView addGestureRecognizer:swipeGesture];
}
- (void)swipeGesture:(UIPanGestureRecognizer *)gesture;
{
NSLog(#"Two fingers swipe gesture");
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]
&& gestureRecognizer.numberOfTouches == 2) {
return NO;
}
return YES;
}
This answer might be late, but I did have a similar problem today and couldn't find a solution, until I figured something out myself. It's quite simple, actually.
Swift 5
We create a gesture
let gesture = UIPanGestureRecognizer(target: self, action: #selector(functionCall))
gesture.minimumNumberOfTouches = 2
gesture.maximumNumberOfTouches = 2
We then assign that gesture to the collectionView, effectively overwriting the scroll gesture on it.
collectionView.addGestureRecognizer(gesture) // simply overwrites the 2 finger gesture on the collectionView
It now is possible to scroll the collectionView with 1, 3 or more fingers, but the 2 finger pan gesture is blocked.