SKSpriteNode button stuck (iOS) after letting go. Advice needed - ios

Question

So... I am working on this small Mario-like game for iOS and have run into a problem that I cannot seem to fix.
When using my controls (see the screenshot) they sometime get "stuck" as in, the iOS device did not notice that I let go of a button. This causes the player to keep on moving in a direction after you have let go of the button.
Edit: It seems that the malfunction happens when I click two buttons at the exact same time.
Hopefully, someone will be able to spot what I can do differently in the following code:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
for (UITouch *touch in touches) {
CGPoint touchLocation = [touch locationInNode:self];
[self touchStateChanged:touchLocation buttonState:YES];
}
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
for (UITouch *touch in touches) {
CGPoint prevTouchLocation = [touch previousLocationInNode:self];
[self touchStateChanged:prevTouchLocation buttonState:NO];
CGPoint touchLocation = [touch locationInNode:self];
[self touchStateChanged:touchLocation buttonState:YES];
}
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
for (UITouch *touch in touches) {
// Some other logic... {...}
[self touchStateChanged:touchLocation buttonState:NO];
}
}
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
for (UITouch *touch in touches) {
CGPoint touchLocation = [touch locationInNode:self];
[self touchStateChanged:touchLocation buttonState:NO];
}
}
-(void)touchStateChanged:(CGPoint)location buttonState:(BOOL)state
{
SKNode *n = [self nodeAtPoint:location];
if ([n.name isEqualToString:#"LeftMove"]) {
self.player.moveLeft = state;
}
else if ([n.name isEqualToString:#"RightMove"]) {
self.player.moveRight = state;
}
else if ([n.name isEqualToString:#"Jump"]) {
self.player.didJump = state;
}
}
Screenshot showing buttons:
Thanks :-)
Partly Solved...
Current solution:
Added an instance variable called _touchEvent of type UIEvent and added the following line to touchesEnded:
_touchEvent = event;
Added the following code to my update method:
if (_touchEvent && (int)[[_touchEvent allTouches]count] == 0) {
self.player.moveLeft = NO;
self.player.moveRight = NO;
self.player.didJump = NO;
}
if (_touchEvent && (int)[[_touchEvent allTouches]count] == 1) {
for (UITouch *touch in [_touchEvent allTouches]) {
SKNode *n = [self nodeAtPoint:[touch locationInNode:self]];
if ([n.name isEqualToString:#"Jump"]) {
self.player.moveLeft = NO;
self.player.moveRight = NO;
}
}
}

Answer 1

I think the problem is the location of touch (in -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event method) is outside any node.
Try to implement something like this
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
for (SKNode *node in yourButtonsArray) {
// Some other logic... {...}
[node setState:NO];
}
}
Or you should take a look at KKButtonBehaviour from KoboldKit framework.