I'm building a game that is primarily played by tapping the screen (anywhere). I have currently added a settings button that when tapped, opens up a settings window.
Problem is, when the settings button is tapped, interaction happens in the game too. Is there any way to prevent this from happening?
My settings screen works in conjunction with a settings function and the override touches began function through a boolean expression.
The game is played through a UITapGestureRecognizer that was added to the view in didMoveToView.
/* Game Interaction & Playability */
override func didMoveToView(view: SKView) {
let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: Selector("tapped:"))
view.addGestureRecognizer(tap)
}
/* Settings Button Interaction */
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
for touch in touches {
let positionInScene = touch.locationInNode(self)
let touchedNode = self.nodeAtPoint(positionInScene)
if let name = touchedNode.name {
if name == "Settings" {
if settingsOpen == false {
settings()
} else {
settings()
}
}
}
}
}
Well, you've got a couple gesture recognizers working here. You don't actually need to add a recognizer to the view to know if someone is tapping it. That's handled already for you (hence the reason why touchesBegan works without adding another recognizer).
I would say remove that extra recognizer, and move the code for tapped: to your touchesBegan.
Related
I have a project where I’m adding three UILabels to the view controller’s view. When the user begins moving their finger around the screen, I want to be able to determine when they their finger is moving over any of these UILabels.
I’m assuming a UIPanGestureRecognizer is what I need (for when the user is moving their finger around the screen) but I’m not sure where to add the gesture. (I can add a tap gesture to a UILabel, but this isn’t what I need)
Assuming I add the UIPanGestureRecognizer to the main view, how would I go about accomplishing this?
if gesture.state == .changed {
// if finger moving over UILabelA…
// …do this
// else if finger moving over UILabelB…
// …do something else
}
You can do this with either a UIPanGestureRecognizer or by implementing touchesMoved(...) - which to use depends on what else you might be doing.
For pan gesture, add the recognizer to the view (NOT to the labels):
#objc func handlePan(_ g: UIPanGestureRecognizer) {
if g.state == .changed {
// get the location of the gesture
let loc = g.location(in: view)
// loop through each label to see if its frame contains the gesture point
theLabels.forEach { v in
if v.frame.contains(loc) {
print("Pan Gesture - we're panning over label:", v.text)
}
}
}
}
For using touches, no need to add a gesture recognizer:
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
if let t = touches.first {
// get the location of the touch
let loc = t.location(in: view)
// loop through each label to see if its frame contains the touch point
theLabels.forEach { v in
if v.frame.contains(loc) {
print("Touch - we're dragging the touch over label:", v.text)
}
}
}
}
How can I avoid a UIButtons .touchDragEnter and .touchDragExit functions from rapid firing? This question demonstrates the issue perfectly, but the only answer does not describe how to work around it. I'm trying to animate a button when the users finger on the button, and animate it again when their finger slides off. Are there any better ways to do this? If not, how should I stop my animation code from firing multiple times when the users finger is right between an .enter and an .exit state?
You could instead track the location of the touch point itself and determine when the touch point moves in and out of the button
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first {
let point = t.location(in: self)
// moving in to the button
if button.frame.contains(point) && !wasInButton {
// trigger animation
wasInButton = true
}
// moving out of the button
if !button.frame.contains(point) && wasInButton {
// trigger animation
wasInButton = false
}
}
}
wasInButton could be a boolean variable set to true when there is a touch down in the button's frame:
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first {
let point = t.location(in: self)
if button.frame.contains(point) {
wasInButton = true
// trigger animation
} else {
wasInButton = false
}
}
This would require you to subclass the button's superview. And since you might not want to animate as soon as the point leaves the button's frame (because the user's finger or thumb would still be covering most of the button), you could instead do the hit test in a larger frame that encapsulates your button.
I am currently working at a sidescroller game, in which the jump height depends on how long the player presses the right half of the screen.
Everything works just fine, except if the user touches the screen quickly. This causes the jump to be as big as possible.
Am I doing something wrong or is this just a problem with the way SpriteKit works?
How can I solve this problem?
EDIT: Here are all the methods handling touches in my game:
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?)
{
for touch in touches
{
swiped = false
let location = touch.location(in: cameraNode)
DispatchQueue.main.asyncAfter(deadline: .now() + 0.065)
{
if self.swiped == false
{
if location.x < 0
{
self.changeColor()
}
else
{
self.jump()
}
}
}
}
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?)
{
for touch in touches {
let location = touch.location(in: cameraNode)
if location.x > 0
{
// Right
thePlayer.endJump()
}
}
}
And then there is also a gesture recognizer handling swiping left and right, with the following handlers:
#objc func swipedRight()
{
if walkstate != .walkingRight
{
walkstate = .walkingRight
}
else
{
boost(direction: 0)
}
swiped = true
}
#objc func swipedLeft()
{
if walkstate != .walkingLeft
{
walkstate = .walkingLeft
}
else
{
boost(direction: 1)
}
swiped = true
}
Hopefully this is enough to describe the problems. The code above is everything I am doing to handle touches.
Well, the problem was, that I am using a DispatchQueue command to call the jumping method after a short delay, in case the user swiped and not tapped. As a result the touchesEnded method gets called before the jump has even started and thus can not be stopped anymore.
To solve this problem I added a boolean variable which is set to true as soon as the player touches the screen and set to false whenever the users finger leaves the screen. In order to jump this variable has to be set to true and thereby the character will not jump after a quick touch anymore.
I am working with xcode to create a view that allows users to drag buttons. with the code below, I can move the button to the touch and drag from there, but I cant click the button and drag.
override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) {
for obj in touches {
let touch = obj as! UITouch
let location = touch.locationInView(self.view)
word1Button.center = location
}
}
Buttons respond to touch events, so when the user touches down within the bounds of a button the view underneath will not receive those touch events. You can get around this by using a gesture recogniser on your button instead of relying on the lower level touch delivery methods. A long press gesture recognizer would probably work best:
// Where you create your button:
let longPress = UILongPressGestureRecognizer(target: self, action: "handleLongPress:")
word1Button.addGestureRecognizer(longPress)
//...
func handleLongPress(longPress: UILongPressGestureRecognizer) {
switch longPress.state {
case .Changed:
let point = longPress.locationInView(view)
button.center = point
default:
break
}
}
Note that by default, the UILongPressGestureRecognizer needs the user to hold down for 0.5 seconds before the gesture starts recognizing (and therefore starts dragging). You can change this with the minimumPressDuration property of UILongPressGestureRecognizer. Be careful not to make it too short though - as soon as the gesture recognizes it will cancel other touches to the button, preventing the button action from being fired when the touch is lifted.
Hi I am currently moving a sprite by checking if the button was pressed in touchesBegan and then updating the position in update. I am doing this so that the user does not need to keep pressing the move up/down/left/right etc button over and over. The problem is that sometimes the sprite does not stop moving which im sure is due to this. Does anyone know a better solution to this? For brevity I will show you the way I am taking care of the up button.
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
for touch: AnyObject in touches {
// Get the location of the touch in this scene
let location = touch.locationInNode(self)
// Check if the location of the touch is within the button's bounds
if upButton.containsPoint(location) {
upButtonPressed = true
}
override func update(currentTime: CFTimeInterval) {
if upButtonPressed == true {
ball.position.y += 3
}
I kept it simple here but I do have all the conditions to stop movement in my code. I am simply wondering if there is an easier way to do this with maybe a long press gesture recognizer?