I have a CCSprite that I want to move around using gestures. Problem is I'm completely new to Cocos2D. I want my sprite to perform one action when the gesture is up, another one when gesture is down, another action when gesture is right and same thing for left. Can someone point me in the right direction?
Thanks!
Apparently each UISwipeGestureRecognizer can only detect the swipe in the given direction. Even though the direction flags could be OR'ed together the UISwipeGestureRecognizer ignores the additional flags.
The solution is to add one UISwipeGestureRecognizer for each direction you want the swipe gesture to be recognized, and set each recognizer's direction accordingly to either up, down, left and right. If you want to test for a swipe in any direction you'll have to add four UISwipeGestureRecognizers.
It's kind of odd but that's the only way it worked for me.
UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeGesture:)];
swipeGesture.direction = UISwipeGestureRecognizerDirectionUp|UISwipeGestureRecognizerDirectionDown;
[self.gestureAreaView addGestureRecognizer:swipeGesture];
[swipeGesture release];
-(void)handleSwipeGesture:(UISwipeGestureRecognizer *) sender
{
//Gesture detect - swipe up/down , can't be recognized direction
}
or
UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeGesture:)];
swipeGesture.direction = UISwipeGestureRecognizerDirectionUp;
[self.view addGestureRecognizer:swipeGesture];
[swipeGesture release];
UISwipeGestureRecognizer *swipeGesture2 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeGesture:)];
swipeGesture2.direction = UISwipeGestureRecognizerDirectionDown;
[self.view addGestureRecognizer:swipeGesture2];
[swipeGesture2 release];
-(void)handleSwipeGesture:(UISwipeGestureRecognizer *) sender
{
//Gesture detect - swipe up/down , can be recognized direction
if(sender.direction == UISwipeGestureRecognizerDirectionUp)
{
}
else if(sender.direction == UISwipeGestureRecognizerDirectionDown)
{
}
}
Use a UIPanGestureRecogizer and detect the swipe directions you care about. see the UIPanGestureRecognizer documentation for details. -rrh
// add pan recognizer to the view when initialized
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panRecognized:)];
[panRecognizer setDelegate:self];
[self addGestureRecognizer:panRecognizer]; // add to the view you want to detect swipe on
-(void)panRecognized:(UIPanGestureRecognizer *)sender
{
if (sender.state == UIGestureRecognizerStateBegan) {
// you might want to do something at the start of the pan
}
CGPoint distance = [sender translationInView:self]; // get distance of pan/swipe in the view in which the gesture recognizer was added
CGPoint velocity = [sender velocityInView:self]; // get velocity of pan/swipe in the view in which the gesture recognizer was added
float usersSwipeSpeed = abs(velocity.x); // use this if you need to move an object at a speed that matches the users swipe speed
NSLog(@"swipe speed:%f", usersSwipeSpeed);
if (sender.state == UIGestureRecognizerStateEnded) {
[sender cancelsTouchesInView]; // you may or may not need this - check documentation if unsure
if (distance.x > 0) { // right
NSLog(@"user swiped right");
} else if (distance.x < 0) { //left
NSLog(@"user swiped left");
}
if (distance.y > 0) { // down
NSLog(@"user swiped down");
} else if (distance.y < 0) { //up
NSLog(@"user swiped up");
}
// Note: if you don't want both axis directions to be triggered (i.e. up and right) you can add a tolerence instead of checking the distance against 0 you could check for greater and less than 50 or 100, etc.
}
}
The defaut direction is UISwipeGestureRecognizerDirectionRight. the multiple directions also can be specified like that :
[swipeGesture setDirection: UISwipeGestureRecognizerDirectionRight|UISwipeGestureRecognizerDirectionLeft];
/// But if you want to get every single direction ,like that:
UISwipeGestureRecognizer *swipeGestureR = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeGestureRight:)];
[swipeGestureR setDirection: UISwipeGestureRecognizerDirectionRight ];
[[[CCDirector sharedDirector] openGLView] addGestureRecognizer:swipeGestureR];
[swipeGestureR release];
UISwipeGestureRecognizer *swipeGestureL = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeGestureLeft:)];
[swipeGestureL setDirection: UISwipeGestureRecognizerDirectionLeft];
[[[CCDirector sharedDirector] openGLView] addGestureRecognizer:swipeGestureL];
[swipeGestureL release];
the function handleSwipeGestureLeft will be called when swipe to left,and handleSwipeGestureRight wil be called when you swipe to right
Add one UISwipeGestureRecognizer for each axe (horizontal and vertical):
UISwipeGestureRecognizer *horizontalSwipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(action)];
[horizontalSwipe setDirection:(UISwipeGestureRecognizerDirectionRight |
UISwipeGestureRecognizerDirectionLeft )];
[self.view addGestureRecognizer:horizontalSwipe];
UISwipeGestureRecognizer *verticalSwipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(action)];
[verticalSwipe setDirection:(UISwipeGestureRecognizerDirectionUp |
UISwipeGestureRecognizerDirectionDown )];
[self.view addGestureRecognizer:verticalSwipe];
Even though there's lots of good info here, I couldn't find a quick answer that had it all.
If you want to differentiate whether a swipe is left or right or up or down, you need to create a new UISwipeGestureRecognizer for each direction.
However! This is not so bad, because you can route each of your gesture recognizers to the same selector, that can then use a switch statement as you might expect.
First, add gesture recognizers for each direction and route them to the same selector:
- (void)setupSwipeGestureRecognizers
{
UISwipeGestureRecognizer *rightSwipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(userDidSwipeScreen:)];
rightSwipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionRight;
UISwipeGestureRecognizer *leftSwipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(userDidSwipeScreen:)];
leftSwipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:rightSwipeGestureRecognizer];
[self.view addGestureRecognizer:leftSwipeGestureRecognizer];
}
Second, differentiate between the directions with a switch statement:
- (void)userDidSwipeScreen:(UISwipeGestureRecognizer *)swipeGestureRecognizer
{
switch (swipeGestureRecognizer.direction) {
case UISwipeGestureRecognizerDirectionLeft: {
// Handle left
break;
}
case UISwipeGestureRecognizerDirectionRight: {
// Handle right
break;
}
default: {
break;
}
}
}
-(void)addGesture {
UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeGesture:)];
[self.view addGestureRecognizer:swipeGesture];
[swipeGesture release];
}
-(void)handleSwipeGesture:(UISwipeGestureRecognizer *) sender {
if (sender.direction == UISwipeGestureRecognizerDirectionUp) {
//do something
}
else if (sender.direction == UISwipeGestureRecognizerDirectionDown) {
//do something
}
else if (sender.direction == UISwipeGestureRecognizerDirectionLeft) {
//do something
}
else if (sender.direction == UISwipeGestureRecognizerDirectionRight) {
//do something
}
}
Can also use a switch instead of all the if statements
