Question

For various reasons, I’ve moved these methods from a UIView subclass to my viewcontroller. And I finally got it working, except for one thing. Not only am I able to drag the UIImageviews I’ve programmatically created, but the actual view controllers view is draggable too. Creating this much undesired effect. I guess it’s the fact that it’s touches anyobject, and the background itself is an object. I’m just not sure how exclude the background. I would think that it would need the “UserInteraction enabled”, but I guess not? I only want it to make UIImageViews draggable. Please forgive my noobness. I’m still learning.

I have all the imageviews i’d want “touchable” in an NSMutableDictionary called “letterDictionary”. Would it be possible to only have touch apply to what’s in the dictionary?

https://i.stack.imgur.com/vdN1T.jpg

- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
    UITouch *touch = [touches anyObject];
    touchPoint = [touch locationInView:self.view];

    movingLetter = [touch view];

    CGPoint pointInside = [touch locationInView:[touch view]];
    if ([movingLetter pointInside:pointInside withEvent:event]) touchedInside = YES;

}


- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    if (touchedInside) {
        UITouch *touch = [touches anyObject];
        CGPoint newPoint = [touch locationInView:self.view];  // get the new touch location
        movingLetter.center = CGPointMake(movingLetter.center.x + newPoint.x - touchPoint.x, movingLetter.center.y + newPoint.y - touchPoint.y);         
        touchPoint = newPoint;      
    }
}


- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    if (touchedInside) {
        UITouch *touch = [touches anyObject];
        CGPoint newPoint = [touch locationInView:self.view];

        movingLetter.center = CGPointMake(movingLetter.center.x + newPoint.x - touchPoint.x, movingLetter.center.y + newPoint.y - touchPoint.y);

        if (CGRectIntersectsRect([movingLetter frame], [placeHolder frame]))
            {
                movingLetter.center = placeHolder.center;
            }

    }   
    touchedInside = NO;
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    touchedInside = NO;
}

Answer 1

You have the view that was touched,

    UITouch *touch = [touches anyObject];
    touchPoint = [touch locationInView:self.view];
    movingLetter = [touch view];

just test to see if it is the class you are looking for (e.g. a UIImageView) then return

    UITouch *touch = [touches anyObject];
    if (![[touch view] isKindOfClass:[UIImageView class]])
    {
       return;
    }