I have the following code which creates four gestures:
self.userInteractionEnabled = YES;
UIPanGestureRecognizer * panGesture = [[UIPanGestureRecognizer alloc]initWithTarget:self action:#selector(handlePan:)];
[panGesture setDelegate:self];
[self addGestureRecognizer:panGesture];
UILongPressGestureRecognizer * longPressGesture = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:#selector(handleLongPress:)];
longPressGesture.minimumPressDuration = 0.00;
[self addGestureRecognizer:longPressGesture];
UISwipeGestureRecognizer * swipeUp = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:#selector(handleSwipeUp:)];
swipeUp.direction = UISwipeGestureRecognizerDirectionUp;
[self addGestureRecognizer:swipeUp];
UISwipeGestureRecognizer * swipeDown = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:#selector(handleSwipeDown:)];
swipeDown.direction = UISwipeGestureRecognizerDirectionDown;
[self addGestureRecognizer:swipeDown];
The Pan and LongPress work fine, but I never get either of the Swipe gestures. Is there something special I need to do to have the swipe selectors get called?
Thanks
I just answered this yesterday.
Short form: a swipe gesture is a special case of a pan gesture, and by default no two gestures will recognize simultaneously. Look into gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: and/or requireGestureRecognizerToFail:. You'll find further help for this and related issues in Apple's guide.
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 am new to iPhone developer,
I made epub reader and loaded each page of epub in my webview
What i want to is, when user does right swipe gesture 2nd time then i want to navigate to new page, i do not want to do anything when user does right swipe gesture for first time.
UISwipeGestureRecognizer *swipeRight
Is there any method something like,
if(swipeRight.touch.count > 2)
{
// do this
}
Any help will be appriciated.
Thanks In Advance !
EDIT
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
float scrollViewHeight = scrollView.frame.size.height;
float scrollContentSizeHeight = scrollView.contentSize.height;
float scrollOffset = scrollView.contentOffset.y;
if (scrollOffset == 0)
{
swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(swipeLeftAction:)];
swipeUp.direction = UISwipeGestureRecognizerDirectionUp;
swipeUp.numberOfTouchesRequired=2;
swipeUp.delegate = (id<UIGestureRecognizerDelegate>)self;
swipeUp.cancelsTouchesInView=YES;
[_webview addGestureRecognizer:swipeUp];
}
else if (scrollOffset + scrollViewHeight == scrollContentSizeHeight)
{
swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(swipeRightAction:)];
swipeDown.direction = UISwipeGestureRecognizerDirectionDown;
swipeDown.numberOfTouchesRequired=2;
swipeDown.delegate = (id<UIGestureRecognizerDelegate>)self;
swipeDown.cancelsTouchesInView=YES;
[_webview addGestureRecognizer:swipeDown];
}
You can tell the UIWebView's UIScrollView that its UIPanGestureRecognizer should only fire when your own UISwipeGestureRecognizer has failed.
This is how you do it:
UISwipeGestureRecognizer *rightSwipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipeGesture:)];
UISwipeGestureRecognizer *leftSwipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipeGesture:)];
rightSwipeGesture.direction = UISwipeGestureRecognizerDirectionRight;
leftSwipeGesture.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:rightSwipeGesture];
[self.view addGestureRecognizer:leftSwipeGesture];
[_webView.scrollView.panGestureRecognizer requireGestureRecognizerToFail:rightSwipeGesture];
[_webView.scrollView.panGestureRecognizer requireGestureRecognizerToFail:leftSwipeGesture];
That should do the trick for you.
Just attach UIGestureRecognizer subclass to that view and hold on for calls...
UISwipeGestureRecognizer* rightSwipeRecognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:#selector(someAction)];
rightSwipeRecognizer.numberOfTouchesRequired = 2;
rightSwipeRecognizer.direction = UISwipeGestureRecognizerDirectionRight;
rightSwipeRecognizer.cancelsTouchesInView = YES;
[self.webView addGestureRecognizer:rightSwipeRecognizer]; // add in your webviewrightSwipeRecognizer
Try like below it will help you
UISwipeGestureRecognizer *rightRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(rightSwipeHandle:)];
rightRecognizer.direction = UISwipeGestureRecognizerDirectionRight;
rightRecognizer.numberOfTouchesRequired = 2;
[self.view addGestureRecognizer:rightRecognizer];
[rightRecognizer release];
I don't think that swipe gestures offer support for the kind of behavior you are aiming at, but you can easily accomplish it by doing the following:
on the first swipe, set a flag and start a timer; for the rest do nothing;
on the second swipe,
a. if the timer has fired (when firing, the timer reset the flag), do as per point 1.
b. is the timer has not fired (the flag is still set), then do you action and cancel the timer.
You might event think of defining a subclass of UISwipeGestureRecognizer to encapsulate all this behavior.
I use the following code to handle 1 finger swipe in my code:
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleViewsSwipe:)];
[swipe setDirection:UISwipeGestureRecognizerDirectionLeft];
[swipe setDelaysTouchesBegan:YES];
[[self view] addGestureRecognizer:swipe];
I know i can add the following line to make it handle 2 fingers swipe:
[swipe setNumberOfTouchesRequired:2];
However when I add the above code 1 finger swipe is no longer detected since the number of touches required is now 2. What can I do to make my code work for 1, 2 or 3 fingers swipe?
I tried using the following code but this doesn't do what I want to do.
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(handleViewsSwipe:)];
[panRecognizer setMinimumNumberOfTouches:1];
[panRecognizer setMaximumNumberOfTouches:3];
[panRecognizer setDelaysTouchesBegan:YES];
[[self view] addGestureRecognizer:panRecognizer];
[panRecognizer release];
Thank you.
In your handleViewsSwipe you can get the numberOfTouches property from the gesture recognizer.
- (void)handleViewsSwipe:(UISwipeGestureRecognizer *)recognizer {
NSUInteger touches = recognizer.numberOfTouches;
switch (touches) {
case 1:
break;
case 2:
break;
case 3:
break;
default:
break;
}
}
Just switch the same method for what to do depending on how many touches you get.
Add three swipe gesture recognizers to your view:
for (int i = 1; i <= 3; ++i) {
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleViewsSwipe:)];
swipe.numberOfTouchesRequired = i;
swipe.direction = UISwipeGestureRecognizerDirectionLeft;
swipe.delaysTouchesBegan = YES;
[self.view addGestureRecognizer:swipe];
}
Worked for me.
For UITapGestureRecognizer, you can set number of taps required to control the recognition of the UITapGestureRecognizer. If you set numberOfTapsRequired to 2 and user taps only once, then the UITapGestureRecognizer won't be triggered.
My question is How about for UIPanGestureRecognizer? How to control its recognition?
I have a view. Once I set a UIPanGestureRecognizer to it, any dragging will trigger the action. But what I want is only the dragging in X-axis. And for non-X-axis dragging, all touch events should be sent to other views underneath.
How can I do it?
THanks
Set its delegate and implement
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer;
Then use
- (CGPoint)velocityInView:(UIView *)view;
on the gesture recogniser to calculate whether the gesture recognizer should handle it or not.
Check How to stop UIPanGestureRecognizer when object moved to certain frame. It may help you.
UIView *holderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, image.size.width, image.size.height)];
UIImageView *imageview = [[UIImageView alloc] initWithFrame:[holderView frame]];
[imageview setImage:image];
[holderView addSubview:imageview];
UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:#selector(scale:)];
[pinchRecognizer setDelegate:self];
[holderView addGestureRecognizer:pinchRecognizer];
UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:#selector(rotate:)];
[rotationRecognizer setDelegate:self];
[holderView addGestureRecognizer:rotationRecognizer];
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(move:)];
[panRecognizer setMinimumNumberOfTouches:1];
[panRecognizer setMaximumNumberOfTouches:1];
[panRecognizer setDelegate:self];
[holderView addGestureRecognizer:panRecognizer];
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapped:)];
[tapRecognizer setNumberOfTapsRequired:1];
[tapRecognizer setDelegate:self];
[holderView addGestureRecognizer:tapRecognizer];
[self.view addSubview:holderView];
Raees
Assume that your gestureRecognizer triggers the action _panRecogPanned below. You can see how the center of a subview ( the view that carries the gesture recognizer itself) moves following the transition. To disable panning on y axis, you simply set the center as the calculated new center, whereas the translation.y is omitted.
To move other subviews on the y axis, get their frame, update their origin.x property and reset the frame, they should follow your finger only on the y axis.
- (IBAction)_panRecogPanned:(id)sender{
CGPoint translation = [_panRecog translationInView:_statementFilterView];
//This subview only moves horizontally
_panRecog.view.center = CGPointMake(translation.x + _panRecog.view.center.x, _panRecog.view.center.y);
//This subview only moves vertically
CGRect newFrame = anotherSubview.frame;
newFrame.origin.y = anotherSubview.frame.origin.y + translation.y;
anotherSubview.frame = newFrame;
[_panRecog setTranslation:CGPointMake(0, 0) inView:self.view];
}
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