I want to stop scrolling after detect second touch and handle touches with my own pinch gesture.
I've tryed this in scroll view:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
if(event.allTouches.count > 2)self.panGestureRecognizer.enabled = NO;
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
if(event.allTouches.count > 2)self.panGestureRecognizer.enabled = YES;
}
But it's doesnt works.
Try this:
scroll.panGestureRecognizer.maximumNumberOfTouches = 1;
But nothing
I find solution. I redefined UIScrollView, and add:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return YES;
}
And disable\enable pan gesture:
if(pinch.state == UIGestureRecognizerStateBegan) scroll.panGestureRecognizer.enabled = NO;
if(pinch.state == UIGestureRecognizerStateEnded) scroll.panGestureRecognizer.enabled = YES;
Now my pinch gesture works.
You can disable scroll View using like this :
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
if ([touches count] == 2) {
//Disable scrollview
}
}
Set delayContentTouches property of UIScrollView to NO (instead of the default YES). This will allow the touch to propagate to the subviews of the scroll view immediately.
I found that setting the enabled property of UIPangestureRecognizer didn't work, at least in my code. However, setting the UIScrollView's scrollEnabled property has worked for me.
scrollView.scrollEnabled = false;
scrollView.scrollEnabled = true;
Related
This is my first time trying to use NSUndoManager and i'm not sure where I should be putting it/what i'm missing. I'm making an application that has a map view with a draw button and undo button. I have the draw button enable the user to draw a polyline and every time their finger leaves the screen it connects another line to the line they just drew. I want the undo button to get rid of the last line that they drew.
some of what I have so far...
- (void)viewDidLoad
{
[super viewDidLoad];
...
...
undoManager = [[NSUndoManager alloc]init];
}
- (IBAction)oopsButton:(id)sender {
[undoManager undo];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
....
....
[[undoManager prepareWithInvocationTarget:self]touchesEnded:(touches) withEvent:event];
[undoManager setActionName:NSLocalizedString(#"Route Changed", #"route undo")];
}
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
...
...
right now, when I click undo, it undoes one line but that's all. I need it to keep undoing for as many times as the user clicks. Thanks for any help on this, i've been looking all over google and stack and haven't found anything that helps yet.
I found a way to update the polyline without using undo manager...
- (IBAction)oopsButton:(id)sender {
//remove last point from array
[self.coordinates removeLastObject];
//update line on map
NSInteger numberOfPoints = [self.coordinates count];
if (numberOfPoints > 1)
{
MKPolyline *oldPolyLine = self.polyLine;
CLLocationCoordinate2D points[numberOfPoints];
for (NSInteger i = 0; i < numberOfPoints; i++)
points[i] = [self.coordinates[i] MKCoordinateValue];
MKPolyline *newPolyLine = [MKPolyline polylineWithCoordinates:points count:numberOfPoints];
[self.mapView addOverlay:newPolyLine];
self.polyLine = newPolyLine;
if (oldPolyLine)
[self.mapView removeOverlay:oldPolyLine];
}
}
I am trying to subclass gesture recognizer to detect touch down , and not touch up .
The subclassing is working , only when i don't put this row to enable scrolling :
[touchDown requireGestureRecognizerToFail:scroller.panGestureRecognizer];
the subclass implementation :
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
if (self.state == UIGestureRecognizerStatePossible)
{
self.state = UIGestureRecognizerStateRecognized;
}
}
problem is , that i need that row ,otherwise the scroller will not move..
implementation :
TouchDownGestureRecognizer *touchDown = [[TouchDownGestureRecognizer alloc] initWithTarget:self action:#selector(handleTouchDown:)];
[scroller addGestureRecognizer:touchDown];
[touchDown requireGestureRecognizerToFail:scroller.panGestureRecognizer];//not work with it.
solution to enable scroller :
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return YES;
}
I have created a UIGestureRecognizer subclass called LongPressGestureRecognizer to simulate a long press gesture. (Yes, I know about the concrete subclass which already exists, I'm just learning objective-c and experimenting a bit.)
I have overridden only the following methods :
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
self.state = UIGestureRecognizerStatePossible;
[self performSelector:#selector(setState:) withObject:[NSNumber numberWithInt:UIGestureRecognizerStateRecognized] afterDelay:2];
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
[NSObject cancelPreviousPerformRequestsWithTarget:self];
self.state = UIGestureRecognizerStateCancelled;
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
[NSObject cancelPreviousPerformRequestsWithTarget:self];
self.state = UIGestureRecognizerStateFailed;
}
and in my view controller with a property recognizer to store the gesture recogniser, i have the following code:
- (LongPressGestureRecognizer *)recognizer
{
if (!_recognizer) {
_recognizer = [[LongPressGestureRecognizer alloc] init];
}
return _recognizer;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self.recognizer addTarget:self action:#selector(log:)];
[self.view addGestureRecognizer:self.recognizer];
}
- (IBAction)log:(LongPressGestureRecognizer *)recognizer
{
//blah blah blah
}
My problem is that log: is not getting called at all... By logging the UIGestureRecogniserStates in the console, I know that the gesture recogniser is working as expected as far as states are concerned...
What am I doing wrong here?
There may be other issues as well, but I can tell you that your -performSelector:withObject:afterDelay: call isn't going to work the way you're hoping; you'll end up passing a pointer to an NSNumber object instead of an int, so state will be set to some kind of junk value. Create a method that will do self.state = UIGestureRecognizerStateRecognized and call that instead.
I'm trying to implement a uitableview that its rows can be dragged to right and left (and show something behind them).
The code works fine, I've implemented it using the following methods:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;
My problem is that the rows also contain UIButtons that when clicking them- should be clicked but when dragging - should drag the entire cell.
I've found this solution. Basically to bubble up the events when clicking on the UIButtons:
[super touchesBegan:touches withEvent:event];
[self.nextResponder touchesBegan:touches withEvent:event];
But, it seems taht the event touchesMoved only bubbles once.
I've seen all sort of questions in this area. Example. But I don't see any solution or responses.
Any help, suggestion or creative workaround would be appreciated!
Instead of implementing touchesBegan, etc. why not use a UIPanGestureRecognizer? I tested this with just a simple rectangular view which was mostly covered by a UIButton. The view was dragged, no matter where I touched, and the button method fired if I clicked over the button.
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(handlePanGesture:)];
[self.theView addGestureRecognizer:panGesture]; //theView is IBOutlet for small view containing a button
}
-(void)viewDidAppear:(BOOL)animated {
self.currentViewFrame = self.theView.frame;
}
- (IBAction)handlePanGesture:(UIPanGestureRecognizer *)sender {
CGPoint translate = [sender translationInView:self.view];
CGRect newFrame = self.currentViewFrame;
newFrame.origin.x += translate.x;
newFrame.origin.y += translate.y;
sender.view.frame = newFrame;
if (sender.state == UIGestureRecognizerStateEnded)
self.currentViewFrame = newFrame;
}
-(IBAction)doClick:(id)sender {
NSLog(#"click");
}
Just check to see which one was touched using the tag system.
I'm currently doing an application where I'm trying to detect touch-positions of the user.
I changed from ccTouchBegan to ccTouchesBegan in the process of implementing the "detect touch-position" function.
But I can't get it to work. I changed from ccTouchBegan to ccTouchesBegan:
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
instead of using:
-(BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event{
When i did this the whole thing crashes when I click the screen. Generating a SIGABRT error higlighting:
#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
-(BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
{
NSAssert(NO, #"Layer#ccTouchBegan override me");
return YES;
}
#endif
#end
So my questions are:
Why do you think it crashes?
What's the difference between ccTouchBegan & ccTouchesBegan? Multi touch abilities?
For further help, this is my code:
-(id) init
{
if( (self=[super init])) {
[CCTexture2D setDefaultAlphaPixelFormat:kCCTexture2DPixelFormat_RGBA8888];
self.isTouchEnabled = YES;
// Set up background
background = [CCSprite spriteWithFile:#"Image.png"];
background.scaleX = 1;
background.scaleY = 1;
background.position = ccp(0,0);
[self addChild:background];
[[CCTouchDispatcher sharedDispatcher]addTargetedDelegate:self
priority:0
swallowsTouches:YES];
// Preload sound effect
soundFile = [SimpleAudioEngine sharedEngine];
if (soundFile != nil) {
[soundFile preloadBackgroundMusic:#"sound.wav"];
}
}
return self;
}
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
NSLog(#"ccTouchesBegan");
// Sets the sound variable to YES
ifOne = YES;
prevPos = [touch locationInView:[touch self]];
prevPos = [[CCDirector sharedDirector] convertToGL:[touch locationInView:touch.self]];
[self schedule:#selector(timerUpdate:) interval:0.1];
//return YES;
}
It's a nice feature in cocos2d which lets you swallow touches in cases that you want to handle only a single touch event.
Try adding this function to your class:
- (void) registerWithTouchDispatcher {
[[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:INT_MIN+1 swallowsTouches:YES];
}
ccTouchesBegan happens the second you tap the screen
ccTouchesEnded happens the second you let go after tapping on the screen
and instead of
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
instead of using:
-(BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event{
try using
-(void)ccTouchesBegan:(UITouch *)...
or
-(void)ccTouchesBegan:(NSSet *)...
or
-(BOOL)ccTouchesBegan:(NSSet *)...
your problem may just be invalid data types or some crap like that, my advice is just try switching the types of touches around.
I would give more info but you didn't provide alot of information to work with, so this is the best I can do.