My app was rejected from the appstore with the reason of not performing correctly in iOS9.
I have downloaded iOS9, and it seems that sprite textures are not performing in the order I create them (this worked well in previous versions of iOS).
Also in
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
the well known
for (UITouch *touch in touches) { .. }
loop won't detect the correct nodes.
Any ideas?
I have an issue with SKSpriteNodes and IOS9. The sprites randomly appeared or not, so I have to set in all of them the zPosition property and now I can see all of them.
After testing the bug - it seems that the option of
for (UITouch *touch in touches) { .. }
Indeed no longer identifies all the nodes in touch location, but only the top most node. Which is bad for games which use it. Instead, you need to use only the following method that currently works:
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInNode:self];
NSArray *nodes = [self nodesAtPoint:location];
for (SKNode *node in nodes) { .. }
Related
Im using the following code:
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
self.location = [touch locationInView:self.view];
NSLog(#"%#", NSStringFromCGPoint(location));
}
In order to try and find where the user might touch the screen, and i thought that [touches anyobject] would allow it to detect where the user has touched the screen even if another object has been selected. However when I select a button it seems that it is not the case. Could anyone help me out?
Thanks!
UIButtons by default "absorb" the touch, so you have to manually pass it along.
Check out this thread for more info:
Is there a way to pass touches through on the iPhone?
I have a view that the users are allowed to finger paint. The code is working perfectly if the area is touched with one finger. For example: I touch it with one finger and move the finger. Then, a line is drawn as I move the first finger. If I touch with a second finger the same view, the line that was being drawn by the first finger stops.
I would like to ignore any touch beyond the first, i.e., to track the first touch but ignore all others to the same view.
I am using touchesBegan/moved/ended.
I have used this to detect the touches
UITouch *touch = [[event allTouches] anyObject];
lastPoint = [touch locationInView:myView];
I have also tried this
lastPoint = [[touches anyObject] locationInView:myView];
but nothing changed.
How do I do that - track the first touch and ignore any subsequent touch to a view?
thanks.
NOTE: the view is NOT adjusted to detect multiple touches.
A given touch will maintain the same memory address as long as it is in contact with the screen. This means you can save the address as an instance variable and ignore any events from other objects. However, do not retain the touch. If you do, a different address will be used and your code won't work.
Example:
Add currentTouch to your interface:
#interface MyView : UIView {
UITouch *currentTouch;
...
}
...
#end
Modify touchesBegan: to ignore the touch if one is already being tracked:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
if(currentTouch) return;
currentTouch = [touches anyObject];
...
}
Modify touchesMoved: to use currentTouch instead of getting a touch from the set:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
if(!currentTouch) return;
CGPoint currentPoint = [currentTouch locationInView:myView];
...
}
Modify touchesEnded: and touchesCancelled: to clear currentTouch, but only if currentTouch has ended or been cancelled.
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
if(currentTouch && currentTouch.phase == UITouchPhaseEnded) {
...
currentTouch = nil;
}
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
if(currentTouch && currentTouch.phase == UITouchPhaseCancelled) {
...
currentTouch = nil;
}
}
yourView.multipleTouchEnabled = NO;
From the reference documents on UIView
multipleTouchEnabled
A Boolean value that indicates whether
the receiver handles multitouch
events.
#property(nonatomic, getter=isMultipleTouchEnabled) BOOL
multipleTouchEnabled Discussion
When set to YES, the receiver receives
all touches associated with a
multitouch sequence. When set to NO,
the receiver receives only the first
touch event in a multitouch sequence.
The default value of this property is
NO.
Other views in the same window can
still receive touch events when this
property is NO. If you want this view
to handle multitouch events
exclusively, set the values of both
this property and the exclusiveTouch
property to YES.
Im having a little problem on handling touches in my apps.
I set my touchesBegan like this:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *currentTouch = [[event allTouches] anyObject];
touchPoint = [currentTouch locationInView:self.view];
if (CGRectContainsPoint(image1.frame, touchPoint)) {
image1IsTouched = YES;
}
}
Then i set my touch move like this:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *currentTouch = [[event allTouches] anyObject];
currentPoint = [currentTouch locationInView:currentTouch.view];
if(image1IsTouched == YES) {
image1.center = CGPointMake(currentPoint.x,currentPoint.y);
.....
}
}
Now i tried my app on actual unit and thats where i notice my problem. While im touching the image1 with 1 finger the app is doing ok and its checking for collision everytime i drag my finger. The problem occurs when i touch the screen with another finger while touching/dragging the image. The image im currently touching will jump to the other finger. I've tried [myView setMultipleTouchEnable:NO]; & using NSArray on touches and comparing the [touches count] with the touch but its not working. Can someone show me how to set a uiimageview to act on single touch only. Thanks.
First, you should use UITouch *currentTouch = [touches anyObject]; to get the current touch.
Second, you should check that touches.count == 1 to make sure there's only one finger on the screen, and ignore touch input if there's more than one, unless you wanted to support multitouch.
I recently downloaded the sample application, GLPaint from apple. This app showed me how to implement drawing, but now I would like to animate a image over the drawn lines. Similarly to how the application "Flight Control" works, I would like to be able to draw a path for an image and then have the image animate over this path.
any ideas?
you could create your path
CGMutablePathRef thePath = CGPathCreateMutable();
and then in the touchesBegan and touchesMoved add to your path
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
if(touch){
CGPoint tapPoint = [touch locationInView: self.view];
CGPathMoveToPoint(thePath, NULL,tapPoint.x,tapPoint.y);
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
if(touch){
CGPoint tapPoint = [touch locationInView: self.view];
CGPathAddLineToPoint(thePath, NULL,tapPoint.x,tapPoint.y);
}
}
and on touchedEnded, as Joshua said, create a CAKeyframeAnimation and set its path to thePath and set the other properties of your animation (duration, etc) and apply it to your object
Look at CAKeyframeAnimation, this allows you to set a path (which is a CGPathRef) for the animation to run along.
Based on code from AtomRiot, I created a simple project on my blog. See this post, also posted a short video showing the result.
However when the animation ends, the image will somehow repositioned back to (0,0), so might need to add extra code to reset the image location after animation finished.
Plus, found that you can't change the animation once it started, have to wait for it to end before you can change it.
Hope this helps!
I am trying to build an iPhone app by using Cocos2d. And i would like to set an image to another fixed position from a fixed position by using touch as my wish(speedy, or slowly). I have got some code but it does not work properly.
so friends it will more helpful to me if i get any solution.
The question is a little fuzzy, but if you want to set the position of a CocosNode you do:
[myNode setPosition:cpv(x,y)];
If you want the node to be offset from a touch location, you can do this by implementing ccTouchesBegan:withEvent
-(BOOL)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView: [touch view]];
CGPoint convertedLocation = [[Director sharedDirector] convertCoordinate:location];
[myNode setPosition: cpv(convertedLocation.x - 100, convertedLocation.y - 100)];
return kEventHandled;
}
That will offset the CocosNode by -100,-100 to where the touch occurred.
The ccTouchesBegan:withEvent: should be implemented in your Layer, and isTouchesEnabled should be set to YES to enable touches.