how to fail UILongPressGestureRecognizer for UIPanGestureRecognizer?

Question

In my view, i added long press gesture and pan gesture as below

UILongPressGestureRecognizer *longPressRecognizer = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(fitToView:)];
    [longPressRecognizer setDelegate:self];
    longPressRecognizer.allowableMovement = 5.0f;
    longPressRecognizer.minimumPressDuration = 2.0;
    [self addGestureRecognizer:longPressRecognizer];

    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(move:)];
    [panRecognizer setMinimumNumberOfTouches:1];
    [panRecognizer setMaximumNumberOfTouches:1];
    panRecognizer.delegate = self;
    [self addGestureRecognizer:panRecognizer];
    [panRecognizer requireGestureRecognizerToFail:longPressRecognizer];

and their gesture handlers are given below:

-(void)move:(UIPanGestureRecognizer*)recognizer {

    CGPoint translatedPoint = [recognizer translationInView:self.imgView ];

    if ([recognizer state] == UIGestureRecognizerStateBegan) {
        _firstX = [self.imgView center].x;
        _firstY = [self.imgView center].y;
    } 

    CGAffineTransform newTransform = CGAffineTransformTranslate(CGAffineTransformIdentity, translatedPoint.x , translatedPoint.y );

    self.imgView.transform = newTransform;

}

-(void)fitToView:(UILongPressGestureRecognizer*)recognizer {

    if ([recognizer state] == UIGestureRecognizerStateBegan) {
        self.imgView.transform = CGAffineTransformIdentity;
    }

}

long press is meant to restore the image. But when i moves the image long press gesture delegate also calls and restoring all the changes i have done. i used [panRecognizer requireGestureRecognizerToFail:longPressRecognizer]; to fail long press recognizer. But it doesnt happens. I also tried delegate method gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:. But it didnt work

remove [longPressRecognizer setDelegate:self]; and panRecognizer.delegate = self; and see is it working? — Ashim, Jun 10 '13 at 12:31
try the other way... [longPressRecognizer requireGestureRecognizerToFail:panRecognizer]; — Prashant Nikam, Jun 10 '13 at 12:39
from your code pangesture will not recive any event when Longpressgesture is active. Hope your need is just reverse. So change to [longPressRecognizer requireGestureRecognizerToFail:panRecognizer] — Ashim, Jun 10 '13 at 12:41

score 0 · Answer 1 · answered Jun 10 '13 at 12:54

0

Try implementing delegate function

gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:

and return YES

answered Jun 10 '13 at 12:54

Adithya

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score 0 · Answer 2 · edited May 23 '17 at 11:44

0

Did you see this related answer Combining a UILongPressGestureRecognizer with a UIPanGestureRecognizer from @annie?

You can do this solely with UILongPressGestureRecognizer.

edited May 23 '17 at 11:44

Community

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answered Jan 08 '15 at 01:10

SwiftArchitect

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how to fail UILongPressGestureRecognizer for UIPanGestureRecognizer?

2 Answers2