I am initializing my gesture recognizers with the following code when I initialize a view. However, after multiple times of presenting a view on top of the one with the gesture recognizers and dismissing it with presentModalViewController and dismissModelViewController, the gesture recognizers stop working on the original view. I've tried manually releasing the recognizers in the view's dealloc function rather than using autorelease, but it doesn't seem to help. Does anyone have any ideas? Thanks!
Also, I should mention that this problem only happens on the device, and not the simulator.
-(void) initializeGestures {
recognizer = [[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTapGesture:)] autorelease];
//recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTapGesture:)];
[(UITapGestureRecognizer *)recognizer setNumberOfTouchesRequired:1];
[self.view addGestureRecognizer:recognizer];
recognizer.delegate = self;
swipeLeftGesture = [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipeGestureLeft:)] autorelease];
//swipeLeftGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipeGestureLeft:)];
swipeLeftGesture.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:swipeLeftGesture];
swipeLeftGesture.delegate = self;
swipeRightGesture = [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipeGestureRight:)] autorelease];
//swipeRightGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipeGestureRight:)];
swipeRightGesture.direction = UISwipeGestureRecognizerDirectionRight; // default
[self.view addGestureRecognizer:swipeRightGesture];
swipeRightGesture.delegate = self;
}
-(IBAction) handleSwipeGestureLeft:(UISwipeGestureRecognizer*)sender
{
[self swipeLeft];
}
-(IBAction) handleSwipeGestureRight:(UISwipeGestureRecognizer*)sender
{
[self swipeRight];
}
-(IBAction) handleTapGesture:(UITapGestureRecognizer *) sender {
[self gotoDefinition];
}
did the view with gesture recognizers dealloc when you present another viewController?
this will cause the view remove gesture recognizers on it
Related
How do I recognise a UISwipeGestureRecognizer with UISwipeGestureRecognizerDirectionUp and then directly after that, WITHOUT lifting my finger, recognise a UISwipeGestureRecognizerDirectionDown recogniser?
Basically I want multiple UISwipeGestureRecognizers being recognised without lifting my finger when I change direction.
My code so far...
- (void)viewDidLoad {
UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(screenSwipedUp)];
swipeUp.numberOfTouchesRequired = 1;
swipeUp.direction = UISwipeGestureRecognizerDirectionUp;
swipeUp.cancelsTouchesInView = NO;
[self.view addGestureRecognizer:swipeUp];
UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(screenSwipedDown)];
swipeDown.numberOfTouchesRequired = 1;
swipeDown.direction = UISwipeGestureRecognizerDirectionDown;
swipeDown.cancelsTouchesInView = NO;
[self.view addGestureRecognizer:swipeDown];
}
- (void)screenSwipedUp {
NSLog(#"SW-Up");
}
- (void)screenSwipedDown {
NSLog(#"SW-Down");
}
I don't think you can do it with UISwipeGestureRecognizer. You can instead use UIPanGestureRecognizer and implement the action OR create a subclass of UIGestureRecognizer and Override the methods to recognize your special gesture.
I want to add to my UIViewController :
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTapGesture:)];
tapGesture.numberOfTapsRequired = 2;
[self.view addGestureRecognizer:tapGesture];
[tapGesture release];
UITapGestureRecognizer *tapGesture2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTapGesture2:)];
tapGesture2.numberOfTapsRequired = 1;
[self.view addGestureRecognizer:tapGesture2];
[tapGesture2 release];
the problem is if the user tap twice the two methods are called,and i want that if the user make double tap only the first(handleTapGesture) will be called and if he make one tap it will call only the second one(handleTapGesture2)
use this one..
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTapGesture)];
tapGesture.numberOfTapsRequired = 2;
[self.view addGestureRecognizer:tapGesture];
[tapGesture release];
UITapGestureRecognizer *tapGesture2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTapGesture2)];
tapGesture2.numberOfTapsRequired = 1;
[tapGesture2 requireGestureRecognizerToFail: tapGesture];
[self.view addGestureRecognizer:tapGesture2];
[tapGesture2 release];
you can use the code i posted on here
in this the method requireGestureRecognizerToFail: is used in viewcontroller.m this will solve your problem
I added this code in cellForRowAtIndexPath
UISwipeGestureRecognizer *gestureR = [[UISwipeGestureRecognizer alloc]
initWithTarget:self action:#selector(handleSwipeFrom:)];
[gestureR setDirection:UISwipeGestureRecognizerDirectionRight];//|UISwipeGestureRecognizerDirectionRight)];
[cell addGestureRecognizer:gestureR];
it works fine. But I want UISwipeGestureRecognizerDirectionLeft so Added like this
[gestureR setDirection:UISwipeGestureRecognizerDirectionLeft|UISwipeGestureRecognizerDirectionRight)];
When I check with direction and state I am always getting 3 = 3
- (void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {
NSLog(#"%d = %d",recognizer.direction,recognizer.state);
}
if I apply only one Gesture it works fine. I tried to add two gestures one by one. but it will responding for only one gesture.
How to add second gestures. I added directly to one gesture to TableView another one to cell but now use.
Try this
UISwipeGestureRecognizer* gestureR;
gestureR = [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipeFrom)] autorelease];
gestureR.direction = UISwipeGestureRecognizerDirectionLeft;
[view addGestureRecognizer:gestureR];
gestureR = [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipeFrom)] autorelease];
gestureR.direction = UISwipeGestureRecognizerDirectionRight; // default
[view addGestureRecognizer:gestureR];
If you want to handle different functionalities on left and right swipes, just change the selectors.
Instead of two times alloc, it would be better if you use
UISwipeGestureRecognizer* recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipe:)];
[recognizer setDirection:UISwipeGestureRecognizerDirectionLeft+UISwipeGestureRecognizerDirectionRight];
[cell addGestureRecognizer:recognizer];
And get the direction of swipe in the action as :
-(void)handleSwipe:(UISwipeGestureRecognizer *) sender
{
if (sender.direction == UISwipeGestureRecognizerDirectionLeft)
{
//do something
}
else //if (sender.direction == UISwipeGestureRecognizerDirectionRight)
{
//do something
}
}
I know its been ages since you asked this.
But try and read following line again in your question.
[gestureR setDirection:UISwipeGestureRecognizerDirectionRight|UISwipeGestureRecognizerDirectionRight)];
Did you realise you added UISwipeGestureRecognizerDirectionRight. Twice!!
:D
Is it possible to alloc only one UIPanGestureRecognizer and attach to multiple views? I have multiple on-screen UIImageView objects that user can move (pan). If I'm making alloc and attaching the same UIPanGestureRecognizer object to all views then the pan gesture works only on the last attached view. I did a workaround by making multiple alloc/init of UIPanGestureRecognizer, I mean one different UIPanGestureRecognizer object for each view. Here's the code:
- (void)viewDidLoad
{
[super viewDidLoad];
UIPanGestureRecognizer * pgr = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(updateImagePosition:)];
[self.panningBtn1 addGestureRecognizer:pgr];
[pgr release];
pgr = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(updateImagePosition:)];
[self.panningBtn2 addGestureRecognizer:pgr];
[pgr release];
...
PS. I also have enabled MultipleTouchEnabled & UserInteractionEnabled. Are there any more elegant solutions?
No - each UIGestureRecognizer can only belong to one view. Just create multiple with the same properties and assign them to the different views.
I suggest creating the gesture recognizer in a method:
-(UIGestureRecognizer *)myGRMethod {
UIPanGestureRecognizer *pgr = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(updateImagePosition:)];
return [pgr autorelease];
}
and then just doing
for (UIView *view in views) {
[view addGestureRecognizer:[self myGRMethod]];
}
i got a strange problem. I got a Superview with customcontrols as subviews.
Their are GestureRecognizer both in superview and subviews.
If i tap a subview its GestureRecognizer gets called and on tap on the superview its tap gets called.
but on long press in the subview SOMETIMES the GestureRecognizer of the superview gets called. I add the GestureRecognizers in the same functions but there is a different attitude.
Superview
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapPiece:)];
tapGesture.numberOfTapsRequired = 1;
//contenView is the area where my controls can be
[self.contentView addGestureRecognizer:tapGesture];
[tapGesture release];
UILongPressGestureRecognizer *longTapGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(longTapPiece:)];
tapGesture.numberOfTapsRequired = 1;
[self.contentView addGestureRecognizer:longTapGesture];
[longTapGesture release];
Subviews
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(selectPiece:)];
tapGesture.numberOfTapsRequired = 1;
[self addGestureRecognizer:tapGesture];
UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(longPiece:)];
longPressGesture.numberOfTapsRequired = 1;
[self addGestureRecognizer:longPressGesture];
Can anyone tell me why the longtap doen't response to my subview and how to fix it.
THANK YOU
got a solution but this is not what i wanted i set the duration of the control lower than the one of the superview [longPressGesture setMinimumPressDuration:0.4]; But the gestureRecognizer should be independend