CODEWITHSUNDEEP
iosuigesturerecognizergestureuipangesturerecognizersimultaneous
Vyachaslav Gerchicov
Vyachaslav Gerchicov

Reputation: 2457

2 various UIPanGestureRecognizers with different directions simultaneously?

It is possible to pan up, down, left and right.

Recognizer 1 handles vertical pans only, recognizer 2 handles horizontal pans only. Both of them are linked with the same one delegate object.

Recognizer 2 is fully independent from the first one (except of only one direction from the described 4 ones may be chosen).

So how to prevent one of them from being executed simultaneously with another one?

Upvotes: 1

Views: 343

Answers (1)

Mukesh
Mukesh

Reputation: 3690

-(void)initPanGestures{
UIPanGestureRecognizer *panGestureRecognizer1 = [[UIPanGestureRecognizer alloc] initWithTarget:self
                                                                action:@selector(handlePan1Gesture:)];

UIPanGestureRecognizer *panGestureRecognizer2 = [[UIPanGestureRecognizer alloc] initWithTarget:self
                                                                                        action:@selector(handlePan2Gesture:)]
}

-(void)handlePan1Gesture:(UIPanGestureRecognizer *)sender{
CGPoint velocity = [sender velocityInView:sender.view];

switch(sender.state) {

        case UIGestureRecognizerStateBegan:
        if(fabs(velocity.y) > fabs(velocity.x)){
            panGestureRecognizer2.enabled=YES;
            panGestureRecognizer1.enabled=NO;
        }
        break;
        case UIGestureRecognizerStateCancelled:
         panGestureRecognizer1.enabled=YES;
        break;
    case UIGestureRecognizerStateEnded:{
        panGestureRecognizer1.enabled=YES;
    }

        break;
}

if(velocity.x > 0)
{
    NSLog(@"gesture went right");
}
else if(velocity.x < 0)
{
    NSLog(@"gesture went left");
}


}

-(void)handlePan2Gesture:(UIPanGestureRecognizer *)sender{
 CGPoint velocity = [sender velocityInView:sender.view];
switch(sender.state) {

    case UIGestureRecognizerStateBegan:
        if(fabs( velocity.x) > fabs(velocity.y)){
            panGestureRecognizer2.enabled=NO;
            panGestureRecognizer1.enabled=YES;

        }
        break;

    case UIGestureRecognizerStateCancelled:
        panGestureRecognizer2.enabled=YES;
        break;
    case UIGestureRecognizerStateEnded:
         panGestureRecognizer2.enabled=YES;
        break;

}


if(velocity.y > 0)
{
    NSLog(@"gesture went down");
}
else if(velocity.y < 0)
{
    NSLog(@"gesture went up");
}

 }

Also For two diff Gesture you have to implement delegate methods and recognise the gestures.Fro example i have used two gesture simultaneously long and pan gesture

#pragma mark - UIGestureRecognizerDelegate methods
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {

return YES;
}

 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
if ([panGestureRecognizer1 isEqual:gestureRecognizer]) {

    return [panGestureRecognizer2 isEqual:otherGestureRecognizer];
}

if ([panGestureRecognizer2 isEqual:gestureRecognizer]) {

    return [panGestureRecognizer1 isEqual:otherGestureRecognizer];
}

return NO;
 }

Upvotes: 1

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