objective-c – 如何正确使用swipeWithEvent浏览webView,Obj-C

我有一个主要的webView,和两个方法导航回来和第四.这里的一大问题是我不太清楚如何写这个问题.我只需要知道如何识别我的webView上的滑动手势,并调用我的两种方法.类似于Safari,Google Chrome和Mozilla Firefox.谢谢.

编辑
我已经实施了这些方法,假设允许我向后滑动.

- (void)swipeWithEvent:(NSEvent *)event {
    NSLog(@"Swipe With Event");
    CGFloat x = [event deltaX];
    //CGFloat y = [event deltaY];

    if (x != 0) {
        (x > 0) ? [self goBack:self] : [self goForward:self];
    }
}


-(BOOL)recognizeTwoFingerGestures
{
    NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
    return [defaults boolForKey:@"AppleEnableSwipeNavigateWithScrolls"];
}

- (void)beginGestureWithEvent:(NSEvent *)event
{
    if (![self recognizeTwoFingerGestures])
        return;

    NSSet *touches = [event touchesMatchingPhase:NSTouchPhaseAny inView:nil];

    self.twoFingersTouches = [[NSMutableDictionary alloc] init];

    for (NSTouch *touch in touches) {
        [twoFingersTouches setObject:touch forKey:touch.identity];
    }
}

- (void)endGestureWithEvent:(NSEvent *)event
{
    if (!twoFingersTouches) return;

    NSSet *touches = [event touchesMatchingPhase:NSTouchPhaseAny inView:nil];

    // release twoFingersTouches early
    NSMutableDictionary *beginTouches = [twoFingersTouches copy];
    self.twoFingersTouches = nil;

    NSMutableArray *magnitudes = [[NSMutableArray alloc] init];

    for (NSTouch *touch in touches)
    {
        NSTouch *beginTouch = [beginTouches objectForKey:touch.identity];

        if (!beginTouch) continue;

        float magnitude = touch.normalizedPosition.x - beginTouch.normalizedPosition.x;
        [magnitudes addObject:[NSNumber numberWithFloat:magnitude]];
    }

    // Need at least two points
    if ([magnitudes count] < 2) return;

    float sum = 0;

    for (NSNumber *magnitude in magnitudes)
        sum += [magnitude floatValue];

    // Handle natural direction in Lion
    BOOL naturalDirectionEnabled = [[[NSUserDefaults standardUserDefaults] valueForKey:@"com.apple.swipescrolldirection"] boolValue];

    if (naturalDirectionEnabled)
        sum *= -1;

    // See if absolute sum is long enough to be considered a complete gesture
    float absoluteSum = fabsf(sum);

    if (absoluteSum < kSwipeMinimumLength) return;

    // Handle the actual swipe
    if (sum > 0)
    {
        [self goForward:self];
    } else
    {
        [self goBack:self];
    }


}

但是,这段代码没有做任何事情.它似乎没有被调用.