CODEWITHSUNDEEP
iosobjective-ccocoa-touch
Buntylm
Buntylm

Reputation: 7383

How to detect Finger Up to down / Down to up with coordinates

As I have CustomView where i want to detect Touch Event like when user do Touch Down/Up and release or visa versa as in this Image.

enter image description here

What I tried

Swipe But in Which i Get only coordinate where user releasing the finger. like tap on X = 100 and releasing on 10 and m getting 10 only.

What i am looking for

Want to get whole coordinate like user tap on X = 100 and release on X = 80 then looking for on every single coordinate changed like 100,99,98,97,96,95,94.......80. equally as finger moving.

Please if anyone have any idea about it or something i forget to do. Please Review.

Upvotes: 0

Views: 570

Answers (3)

SachinVsSachin
SachinVsSachin

Reputation: 6427

Change this to your .h file

@interface ViewController : UIViewController{
    CGFloat touchStartPoint;
    CGFloat touchOffsetPoint;
    CGFloat tempTouchOffsetPoint;
}

@end

And this to your .m file

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch=[touches anyObject];
    touchStartPoint=[touch locationInView:self.view].y;
    touchOffsetPoint = 0;
    tempTouchOffsetPoint = 0;
    //  NSLog(@"touchStartPoint = %f",touchStartPoint);   
}


-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch=[touches anyObject];
    touchOffsetPoint = [touch locationInView:self.view].y - touchStartPoint;


    if (touchOffsetPoint>tempTouchOffsetPoint) {
        NSLog(@"touch down");
    }else{
        NSLog(@"touch up");
    }

    tempTouchOffsetPoint = touchOffsetPoint;
}

Upvotes: 1

Adrian P
Adrian P

Reputation: 6529

Here is how I have done it:

 UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc]  initWithTarget:self action:@selector(handleSwipeGesture:)];
 swipeGesture.direction =    UISwipeGestureRecognizerDirectionUp|UISwipeGestureRecognizerDirectionDown;
 [self.gestureAreaView addGestureRecognizer:swipeGesture];
 [swipeGesture release];

  -(void)handleSwipeGesture:(UISwipeGestureRecognizer *) sender 
 {
//Gesture detect - swipe up/down , can't be recognized direction
 }
 UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc]    initWithTarget:self action:@selector(handleSwipeGesture:)];
 swipeGesture.direction = UISwipeGestureRecognizerDirectionUp;
 [self.view addGestureRecognizer:swipeGesture];
 [swipeGesture release];

 UISwipeGestureRecognizer *swipeGesture2 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeGesture:)];
 swipeGesture2.direction = UISwipeGestureRecognizerDirectionDown;
 [self.view addGestureRecognizer:swipeGesture2];
 [swipeGesture2 release];

 -(void)handleSwipeGesture:(UISwipeGestureRecognizer *) sender 
 {
//Gesture detect - swipe up/down , can be recognized direction
if(sender.direction == UISwipeGestureRecognizerDirectionUp)
{
}
else if(sender.direction == UISwipeGestureRecognizerDirectionDown)
{
}
}

Hope this helps out

Upvotes: 1

Maksim
Maksim

Reputation: 2052

Try this method

// declared somewhere
@property (nonatomic, retain) NSMutableArray *touchPositions;

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesBegan:touches withEvent:event];
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint loc = [touch locationInView:self];
    [self.touchPositions addObject:[NSValue valueWithCGPoint:loc]];
}

Upvotes: 0

Related Questions