Sending arguments to gesture recognizer initialization selector?
Solution 1
The correct signature for the method to call would be:
-(void) PlanetTapped: (UIGestureRecognizer*)gestureRecognizer
then you could access the view that received the gesture by calling:
-(void) PlanetTapped: (UIGestureRecognizer*)gestureRecognizer {
UIImageView* aPlanet = gestureRecognizer.view;
...
}
Indeed, this is what UIGestureRecognizer reference states:
A gesture recognizer has one or more target-action pairs associated with it. If there are multiple target-action pairs, they are discrete, and not cumulative. Recognition of a gesture results in the dispatch of an action message to a target for each of those pairs. The action methods invoked must conform to one of the following signatures:
- (void)handleGesture;
- (void)handleGesture:(UIGestureRecognizer *)gestureRecognizer;
Solution 2
- (void)viewDidLoad
{
UILongPressGestureRecognizer *longPressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPressOnPhotos:)];
[yourView addGestureRecognizer:longPressRecognizer];
}
- (IBAction)handleLongPressOnPhotos:(UILongPressGestureRecognizer *)sender{
// use "sender.view" to get the "yourView" you have long pressed
}
hope these would help you.
Fitzy
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Updated on June 05, 2022Comments
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Fitzy almost 2 years
In my program, I have a
UITapGestureRecognizer
which I have initialized withinitWithTarget: action:
. I have passed in a selector to call a method by the name ofPlanetTapped: (UIImageView *)aPlanet
. This calls the method fine, however I would like to know how to pass arguments intoaction:
like you would withperformSelector: withObject
. Is this popssible? It would make sense to allow you to send arguments to theUIGestureRecognizer
's selector. Any help is appreciated.