One Quickie

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Adding gesture recognizers (UIView->General)

Gesture recognizers are cool. Here is how you can add them to a UIView, say at init or view loading time:

    UITapGestureRecognizer *tap =
        [[UITapGestureRecognizer alloc] initWithTarget: self
                                        action: @selector(twoByThreeTap:)];
    tap.numberOfTapsRequired = 2;
    tap.numberOfTouchesRequired = 3;
    [self addGestureRecognizer: tap];
    [tap release];

If you're not getting taps, perhaps you're using a default UIImageView, you'll probably need to turn on interaction and multitouch, either in IB or in code:

    // So we can get the taps.
    self.userInteractionEnabled = YES;
    self.multipleTouchEnabled = YES;