I am using a UICollectionView in my ViewController for displaying images and i want that user should be able to delete photos on long press, but i am not able to detect long press gesture. I have read all the previous discussions and tried to implement them in my project also but none of them worked for me.
Enable user interaction for your imageview by below line
imgview.userInteractionEnabled =YES;
//Here is sample code
UILongPressGestureRecognizer *gestureRecognizer = [[UILongPressGestureRecognizer alloc] init];
[gestureRecognizer addTarget:self action:#selector(imgLongPressed:)];
gestureRecognizer.delegate = self;
imgview.userInteractionEnabled =YES;
[imgview addGestureRecognizer: gestureRecognizer];
- (void) imgLongPressed:(UILongPressGestureRecognizer*)sender
{
UIImageView *view_ =(UIImageView*) sender.view;
CGPoint point = [sender locationInView:view_.superview];
if (sender.state == UIGestureRecognizerStateBegan)
{
}
else if (sender.state == UIGestureRecognizerStateChanged)
{
}
else if (sender.state == UIGestureRecognizerStateEnded)
{
}
}
Related
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];
}
}
I am trying to mix an UISwipeGestureRecognizer with an UITableView.
What I would like to do is, while I am doing the swipe gesture, move at the same time the UITableView outside the window and refresh the table data.
I am going to show you with images...
This is my view:
My View
And I would like to get something like this:
Desired View
I am able to move the table when the swipe gesture is ended, but not while I am doing the gesture, and that is what I want.
This is my code:
- (void)viewDidLoad
{
[super viewDidLoad];
swipeToRight = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:#selector(changeToGroup:)];
[swipeToRight setDelegate:self];
[swipeToRight setDirection:UISwipeGestureRecognizerDirectionRight];
[[self table]addGestureRecognizer:swipeToRight];
swipeToLeft = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:#selector(changeToContact:)];
[swipeToLeft setDelegate:self];
[swipeToLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
[[self table]addGestureRecognizer:swipeToLeft];
}
- (void)changeToGroup:(UISwipeGestureRecognizer *)swipeGesture
{
NSLog(#"Right to group");
[self updateTableData]; //Here I move the table and update data.
[segmentedControl setSelectedSegmentIndex:0];
}
- (void)changeToContact:(UISwipeGestureRecognizer *)swipeGesture
{
NSLog(#"Left to contact");
[self updateTableData]; //Here I move the table and update data.
[segmentedControl setSelectedSegmentIndex:1];
}
I thought that I could do it with UIGestureRecognizerStateBegan, adding the animations inside that event, but I can't receive it...
Could anyone help me?
Thanks a lot!!.
Try this,
use UIPanGestureRecognizer
UIPanGestureRecognizer *recognizer = [[UIPanGestureRecognizer alloc]
initWithTarget:self action:#selector(handlePan:)];
[recognizer setMaximumNumberOfTouches:1];
[recognizer setDelegate:self];
[[self table]addGestureRecognizer:recognizer];
and in
- (void) handlePan:(UIPanGestureRecognizer *)recognizer {
UIView *view = self.tableView;
if(recognizer.state == UIGestureRecognizerStateBegan) {
// remember where the pan started
//panGestureOrigin is a CGPoint variable
panGestureOrigin = view.frame.origin;
//optional to keep an enum to keep direction
//self.panDirection = MenuPanDirectionNone;
}
CGPoint translatedPoint = [recognizer translationInView:view];
if(translatedPoint.x > 20) {
//self.panDirection = MenuPanDirectionRight;
[self handleRightPan:recognizer];
} else if(translatedPoint.x < 0) {
//self.panDirection = MenuPanDirectionLeft;
[self handleLeftPan:recognizer];
}
}
- (void) handleRightPan:(UIPanGestureRecognizer *)recognizer {
//animate here
if(recognizer.state == UIGestureRecognizerStateEnded) {
NSLog(#"Right to group");
[self updateTableData]; //Here I move the table and update data.
[segmentedControl setSelectedSegmentIndex:0];
}
}
- (void) handleLeftPan:(UIPanGestureRecognizer *)recognizer {
// animate here
if(recognizer.state == UIGestureRecognizerStateEnded) {
NSLog(#"Left to contact");
[self updateTableData]; //Here I move the table and update data.
[segmentedControl setSelectedSegmentIndex:1];
}
}
I have a custom implementation of UITableViewCell.
The UITableViewCell can be swiped to the left or the right.
I use a UIPanGestureRecognizer for the same.
UIGestureRecognizer* recognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(handlePan:)];
recognizer.delegate = self;
[self addGestureRecognizer:recognizer];
}
#pragma mark - horizontal pan gesture methods
-(BOOL)gestureRecognizerShouldBegin:(UIPanGestureRecognizer *)gestureRecognizer {
CGPoint translation = [gestureRecognizer translationInView:[self superview]];
// Check for horizontal gesture
if (fabsf(translation.x) > fabsf(translation.y)) {
return YES;
}
return NO;
}
-(void)handlePan:(UIPanGestureRecognizer *)recognizer {
if (recognizer.state == UIGestureRecognizerStateBegan) {
// if the gesture has just started, record the current centre location
// SOME CODE
}
if (recognizer.state == UIGestureRecognizerStateChanged) {
// translate the center
//SOME CODE
}
if (recognizer.state == UIGestureRecognizerStateEnded) {
// the frame this cell would have had before being dragged
//SOME CODE
}
}
Now I want to be able to support two finger swipe on on the entire screen such that even if a two finger swipe is done on a UITableViewCell, the above code is not triggered.
How can I achieve this ?
If you set the maximumNumberOfTouches on your gesture recognizer to 1, it will no longer accept multi-finger swipes:
UIGestureRecognizer* recognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(handlePan:)];
recognizer.maximumNumberOfTouches = 1;
I have having problems using a UILongPressGestureRecognizer together a draggable MKPinAnnotationView.
The behaviour I am trying to produce is similar to the Maps App.
The pin can be dragged.
When there is a long press/ tap, a pin is dropped.
However, I have problems having the long press being recognized outside the frame of the MKPinAnnotationView. The long press gesture to drop the pin works fine if the Pin is not draggable. When the pin is draggable however, I can't get the long press gesture recognizer to be recognized so that I can drop pin.
Any ideas?
By the way, I have tried to set the delegate for the long press recognizer so that
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return YES;
}
In this case, the long press gestures are recognized and the pins are dropped, but the dragging of the pin no longer works.
Snippets of the MapView (a subclass of MKMapView)
- (id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
// init the gesture recognizer
UILongPressGestureRecognizer* lpgr = [[UILongPressGestureRecognizer alloc]
initWithTarget:self action:#selector(handleLongPress:)];
lpgr.minimumPressDuration = 0.5f; //user needs to press for 2 seconds
lpgr.delegate = self;
[self addGestureRecognizer:lpgr];
[lpgr release];
//add some initial annotation
Marker *_annotation = [[Marker alloc] initWithCoordinate:_location];
[_annotation titleWithString:#"some title"];
[self addAnnotation:_annotation];
}
return self;
}
- (void)handleLongPress:(UIGestureRecognizer *)gestureRecognizer
{
if (gestureRecognizer.state != UIGestureRecognizerStateBegan)
{
return;
}
CGPoint touchPoint = [gestureRecognizer locationInView:self];
CLLocationCoordinate2D touchMapCoordinate = [self convertPoint:touchPoint toCoordinateFromView:self];
// add marker to self-map
// Marker is subclass of MKAnnotation
Marker *_annotation = [[Marker alloc] initWithCoordinate:_location];
[_annotation titleWithString:#"some title"];
[self addAnnotation:_annotation];
}
- (MKAnnotationView *)mapView:(MKMapView *)mView viewForAnnotation:(id<MKAnnotation>) annotation {
if([annotation isMemberOfClass:[Marker class]] ) {
// use MKPinAnnotationView for the view
MKPinAnnotationView *_pin = (MKPinAnnotationView *) [mView dequeueReusableAnnotationViewWithIdentifier:#"spot_pin"];
if (_pin == nil)
{
_pin = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"spot_pin"] autorelease];
}
else
{
_pin.annotation = annotation;
}
[_pin setDraggable:YES];
[_pin setSelected:YES animated:YES];
[_pin setCanShowCallout:YES];
return _pin;
} else {
return nil;
}
}
Ok guys, I solved it.
Apparently when after I subclassed MKMapView, I also added a method handleLongPress. This method apparently interfered with the handleLongPress method of the MKMapView.
Just by changing my handleLongPress selector to a different name like handleLongPress2 will make it work like the Maps app.
UILongPressGestureRecognizer* lpgr = [[UILongPressGestureRecognizer alloc]
initWithTarget:self action:#selector(handleLongPress2:)];
In my app I should implement the drag and drop of a imageView; the problem is that my imageView is inside a scrollview; it's my code
- (void) viewDidLoad{
[super viewDidLoad];
UILongPressGestureRecognizer *downwardGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(dragGestureChanged:)];
[scrollViewAlfabeto addGestureRecognizer:downwardGesture];
for (UIGestureRecognizer *gestureRecognizer in myscrollView.gestureRecognizers)
{
[gestureRecognizer requireGestureRecognizerToFail:downwardGesture];
}
}
- (void) dragGestureChanged:(UIPanGestureRecognizer*)gesture
{
CGPoint point = [gesture locationInView:scrollViewAlfabeto];
if (gesture.state == UIGestureRecognizerStateBegan)
{
[imageViewToMove removeFromSuperview];
[self.view addSubview:imageViewToMove];
UIView *draggedView = [myscrollView hitTest:point withEvent:nil];
if ([draggedView isKindOfClass:[UIImageView class]])
{
imageViewToMove = (UIImageView*)draggedView;
}
}
else if (gesture.state == UIGestureRecognizerStateChanged)
{
imageToMove.center = point;
}
else if (gesture.state == UIGestureRecognizerStateEnded ||
gesture.state == UIGestureRecognizerStateCancelled ||
gesture.state == UIGestureRecognizerStateFailed)
{
// Determine if dragged view is in an OK drop zone
// If so, then do the drop action, if not, return it to original location
NSLog(#"point.x final:%f", point.x);
NSLog(#"point.y final:%f", point.y);
if (CGRectContainsPoint(goal.frame, point)){
imageToMove.frame = CGRectMake(167, 159, 100, 100);
}
else{
[imageToMove removeFromSuperview];
[myscrollView addSubview:imageToMove];
[imageToMove setFrame:CGRectMake(12, 38, 100, 100)];
imageToMove = nil;
}
}
}
Then with my code I'm able to take an imageView from scrollView with longpress, drag it inside "self.view"; also if I drop this imageView over another imageView in self.view it puts on it. It work fine. But I have two problems:
1- when I drag this imageView and I do
[imageViewToMove removeFromSuperview];
[self.view addSubview:imageViewToMove];
the image view don't appear under my finger but in other position and I want that it remains under my finger
2- This code work only the first time when I launch my viewcontroller, because If I don't drop the imageview over other imageview inside self.view, itr return inside scrollview, but If I want drag it a second time, it don't work.
Can you help me?
I'm not advanced in objc, but...
Allow user ineraction [self.view userInteractionEnabled:YES];
Try [self.view setMultipleTouchEnabled:YES];
Taken from the documentation of UIView in relation to userInteractionEnabled:
Discussion
When set to NO, user events—such as touch and
keyboard—intended for the view are ignored and removed from the event
queue. When set to YES, events are delivered to the view normally. The
default value of this property is YES.
During an animation, user interactions are temporarily disabled for
all views involved in the animation, regardless of the value in this
property. You can disable this behavior by specifying the
UIViewAnimationOptionAllowUserInteraction option when configuring the
animation.
Hope it works