CODEWITHSUNDEEP
iosobjective-cuiscrollview
Jason Renaldo
Jason Renaldo

Reputation: 2822

Getting tag of object from UITapGestureRecognizer

I have a UIScrollView used inside a custom class that subclasses UIView. Within that scrollview, I have added several other custom objects (all subclassing UIView as well) like so:

UITapGestureRecognizer *tap;

    for (int count = 0; count < ColorSchemeCount; count++) {
        //Check for next page first
        [self managePageAdditions];

        //Set up the scheme
        ColorScheme *scheme = [[ColorScheme alloc]
                               initWithFrame:[self determineSchemeCircleFrameFromCount:pageCheck]
                               title:[self getColorSchemeTitleFromIndex:pageCheck]
                               colors:[self getColorSchemeFromIndex:pageCheck]];
        scheme.tag = pageCheck;
        tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(schemeTouchedAtIndex:)];
        tap.cancelsTouchesInView = NO;
        [scheme addGestureRecognizer:tap];
        [self.scrollView addSubview:scheme];

        //See if next pass requires a new page or not
        if(pageCheck > 0) needsNextPage = (pageCheck % kSchemesPerPage == 0);
        needsNextPage ? pageCheck = 0 : pageCheck++;
    }

And then I try to see the ColorScheme's tag to respond accordingly:

- (void)schemeTouchedAtIndex:(UITapGestureRecognizer *)gesture{
    CGPoint touchPointInSuperview = [gesture locationInView:self.scrollView];
    ColorScheme *touchedView = (ColorScheme *)[self.scrollView hitTest:touchPointInSuperview withEvent:nil];

    NSLog(@"%li", (long)touchedView.tag);
}

And no matter what I seem to do, it always logs the tag as zero.

A couple of observations:

Stumped on this one, any help is much appreciated.

Upvotes: 6

Views: 8628

Answers (1)

David Wong
David Wong

Reputation: 10294

-(void)schemeTouchedAtIndex:(UITapGestureRecognizer *)gesture{
NSLog(@"%ld", gesture.view.tag);
}

Since your gestures are hooked to the ColorScheme object its less hacky to grab the view from the gesture recognizer itself.

Upvotes: 26

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