I am working on making an iPhone game involving a spaceship moving from left to right on the screen. I want to make it such that the ship only moves if the buttons are pressed. Here is my current code that creates movement, but it doesnt stop when the button is no longer pressed.
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
CGSize winSize = [CCDirector sharedDirector].winSize;
NSSet *allTouches = [event allTouches];
UITouch *touch = [allTouches anyObject];
CGPoint location = [touch locationInView:[touch view]];
location = [[CCDirector sharedDirector] convertToGL:location];
if (CGRectContainsPoint([_paddle2 boundingBox], location)){
int bottomOfScreenX = 0 + _Paddle1.contentSize.width/2;
id action = [CCMoveTo actionWithDuration:5 position:ccp(bottomOfScreenX,winSize.height/3) ];
[_starShip runAction:action];
[action setTag:1];
}
}
-(void)ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event
{
[_starShip stopActionByTag:1];
}
I believe it has to do with your use of "ccTouchesBegan" along with "ccTouchEnded". Notice "touches" versus "touch". They need to be consistent. ccTouchesBegan handles multiple touch events, while ccTouchBegan is meant for a single touch event. So since it appears you are dealing with a single touch event, you really do not need to use ccTouchesBegan. Switch it to ccTouchBegan and you should be fine.
THe problem with this code is that the TouchHasEnded and TouchHasBegan are each using different argument setters. THe Touch began is using an NSSet while the TouchEnded is suing a UITouch. Set the TouchHasEnded as a
-(void)ccTouchEnded:(NSSet *)Touches withEvent:(UIEvent *)event;
or
have the touch began
-(void)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event.
The second method will require a slight tweak to the logic.
Related
I use the following code to move an UIImageView
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];
paddle.center = CGPointMake(location.x, paddle.center.y);
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
[self touchesBegan:touches withEvent:event];
}
It works great, moving from left to right. But i can't figure out how to avoid moving over the screen, i meant to move it but don't intersect right and left edges of my screen. let's say 10 pixels from left and 10 from right.
First of all, you are the one saying this:
paddle.center = CGPointMake(location.x, paddle.center.y);
So where paddle is, is entirely up to you. If you don't want it at a certain x value, don't set it to that x value.
Second, never never call touchesBegan from within touchesMoved.
Third, you'd be much happier and safer using a UIPanGestureRecognizer. Situations like this are exactly what it's for.
I am trying to make a button in sprite kit using SKSpriteNode. I want the button image to change when it is pressed and revert back to old image as soon as the press ends. What i have done till now is following:-
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
self.startTouch = [[touches allObjects][0] locationInNode:self ];
for (UITouch *touch in touches){
CGPoint position = [touch locationInNode:self];
SKNode *node = [self nodeAtPoint:position];
if ([node.name isEqualToString:#"missileButton"]) {
TEMissileButtonNode *button = (TEMissileButtonNode*) node;
button.isPressed = YES;
}
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
for (UITouch *touch in touches){
CGPoint position = [touch locationInNode:self];
SKNode *node = [self nodeAtPoint:position];
if ([node.name isEqualToString:#"missileButton"]) {
TEMissileButtonNode *button = (TEMissileButtonNode*) node;
button.isPressed = NO;
}
}
}
inside the update method i am calling this method to check if the touch has ended
-(void)changeMissileButton{
if (self.missileButton.isPressed) {
[self.missileButton addMoreMissileButtons];
[self.missileButton setTexture:[SKTexture textureWithImageNamed:#"missileButtonPressed"]];
}else{
[self.missileButton setTexture:[SKTexture textureWithImageNamed:#"missileButtonDeselected"]];
[self.missileButton hideMissileButtons];
}
}
The issue is that the touch doesn't get registered at times. Sometimes it works the way i want. When i touch it, its texture changes and when i remove my finger, the texture reverts back to old texture. But most of the times, the button doesn't react to my touch. Am i missing something?
Use touchesBegan, touchesMoved, touchesEnded.
touchesBegan - check if the button (SKSpriteNode) contains the touch. If so, change you button texture.
touchesMoved- if button does not contain touch, change texture back.
touchesEnded- if touch stayed within button during touchesMoved, change texture back.
Above is the logic for how to efficiently accomplish what you are trying to do. Yes, it is annoying Spritekit decided to abandon buttons.
I have been trying to implement a method where the user can press down the play button, it then changes the texture to the pressed down image. Then, if the user decides not to continue with their action. Such as starting the game. They can then simply drag out of the sprite's frame/body which will then no longer detect the touch as one which will start the action.
The problem with this implementation is that I can't make the touch on the button cancel if the user drags outside of the play button's sprite frame.
The code you will see below doesn't have the transition between the scenes, as I'd like to test the button's usability before having to always quit the application to try the button.
Also, I have declared the majority of objects in the .h file.
Code from MenuScene.m:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
//Touch detection declaration
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInNode:self];
touchNode = [self nodeAtPoint:touchLocation];
if([touchNode.name isEqualToString:#"playButton"]){
[playButtonSprite runAction:changePlayButtonTextureON];
}else{}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
if ([touchNode.name isEqualToString:#"playButton"]) {
[playButtonSprite runAction:changePlayButtonTextureOFF];
}
}
I would also like to know if there is an alternative method to detecting if the touch is on the play button sprite node. Though, this may be solved when a solution is found for the previous issue I have mentioned.
The best way to handle this would be to subclass SKSpriteNode to handle touches on it's own. You can see such an implementation in this project on GitHub. It cancels the touch when the touch goes out of the node's bounds.
The existing code you have posted is good as the code will not get called when the touch ends out of the play button's bounds.
In your case, since you are handling the touches from the scene itself, you can explicitly set the playButton's texture whenever the touch is detected outside the node's bounds.
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInNode:self];
touchNode = [self nodeAtPoint:touchLocation];
if(![touchNode.name isEqualToString:#"playButton"]){
[playButtonSprite runAction:changePlayButtonTextureOFF];
}
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
//Touch detection declaration
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInNode:self];
touchNode = [self nodeAtPoint:touchLocation];
if([touchNode.name isEqualToString:#"playButton"]){
[playButtonSprite runAction:changePlayButtonTextureON];
playButtonSprite.isON = YES;
}else{}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
if (playButtonSprite.isON) {
if ([touchNode.name isEqualToString:#"playButton"]) { // The user really wants to play!
[self startPlaying];
}
[playButtonSprite runAction:changePlayButtonTextureOFF];
playButtonSprite.isON = NO;
}
}
Where changePlayButtonTextureON also sets playButtonSprite.isON to YES, and vise versa.
You will want to make a subclass of SKSpriteNode for playButtonSprite, and add that boolean property isON there.
Can't seem to find an answer to this one anywhere.
My game starts when the user touches the screen, there is a path that the finger must stay within, if it touches/intersects the edges then I want it to run the method [self gameover].
The edge will be a UIImageView.
Thanks everyone.
I hope you have overridden the touches moved event. check either the user touch intersects your image view like below.
-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint point =[touch locationInView:self.view];
if (CGRectContainsPoint(self.imageView.frame, point))
{
//Intersects
[self gameOver];
}
}
I want to shift the position of some UILabels when the user swipes the screen--specifically, move them the same distance the user swiped their finger.
How would I go about detecting and implementing this?
Thanks
Override touchesBegan:withEvent and touchesMoved:withEvent:. Keep track of the starting location in touchesBegan:withEvent. If repeated calls to touchesDragged (it is called while the drag is happening) show that you are moving fast enough for the action to be a swipe versus just a drag, use the difference between the starting location and the current touch location to animate changing the UILabels.
You can do that by using following methods for UIView.
In touchesBegan you should store the position where the user first touches the screen. So you can identify the left or right swipe when touches ends.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
self.startPoint = [touch locationInView:self];
}
Record the final position on touchesEnded method. By comparing this two positions you can determine the direction of movement.
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint endPosition = [touch locationInView:self];
if (startPoint.x < endPoint.x) {
// Right swipe
} else {
// Left swipe
}
}
I hope this helps.