检测 UIIMageView 上的两指触摸

Question

I am trying to detect two finger touch on a UIImageView object. In xib I had set multi-touch enbled. Then I implemented the following code:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    //NSLog(@"%@", [[touches anyObject] class]);
    UITouch* touch = [touches anyObject];
    NSLog(@"%@", [touch class]);
    if ([touches count] > 1)
        NSLog(@"multi touches: %d fingers", [touches count]);

    NSUInteger numTaps = [touch tapCount];

    if (numTaps == 1) {
        NSLog(@"single tap");
    } else {
        NSLog(@"multi tap: %d", numTaps);
    }
}

What actually happning with this code is: This is detecting multiple taps not multi-touch. How can I detect that user touched on object with two finger(Multi-Touch).

Thanks

Answer 1

Use gestureRecognizers like this:

UITapGestureRecognizer *twoFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleFingerTap:)];
twoFingerTap.numberOfTouchesRequired = 2;
[super addGestureRecognizers:twoFingerTap];

http://developer.apple.com/library/ios/#documentation/EventHandling/Conceptual/EventHandlingiPhoneOS/GestureRecognizers/GestureRecognizers.html

Answer 2

At this point you are really better off using a gesture recognizer, looking for two taps with two fingers.

Answer 3

You can use event object for the same as

 NSSet *touch = [event allTouches];
 int touchCounts = [touch count];
 if(touchCounts >2)
 {
 //Multitouch.
 }