Two finger swipe in Yosemite 10.10 - objective-c

Question

I have been using a similar method to as this:
https://github.com/oscardelben/CocoaNavigationGestures
To capture two finger swipes on the Mac, under Yosemite it is no longer working. Anyone know what has change, or what I need to change for this to work.

Answer 1

The accepted answer didn't work well for me - it would often not detect the swipe. Instead, I overrode wantsScrollEventsForSwipeTrackingOnAxis:(NSEventGestureAxis)axis to return YES for the appropriate axis, then overrode scrollWheel:(NSEvent *)theEvent to detect scrolling. Works perfect every time.

Answer 2

The complete answer in Swift 5.3, based on #bmuller would be:
override func wantsScrollEventsForSwipeTracking(on axis: NSEvent.GestureAxis) -> Bool {
return axis == .horizontal
}
override func scrollWheel(with event: NSEvent) {
if event.scrollingDeltaX < 0 {
print("Go forward")
}
else {
print("Go back")
}
}
Multiple swipe events might be sent in a single gesture with this code. You may need to add phase(NSEventPhase) handling code to the scrollWheel(...) function e.g.
override func scrollWheel(with event: NSEvent) {
guard event.phase == .began else {
return
}
if event.scrollingDeltaX < 0 {
print("Go forward")
}
else {
print("Go back")
}
}

Answer 3

On your Mac, go to system preferences and you will find all the different settings of the trackpad.
From here: https://discussions.apple.com/thread/5710582
Hope I helped.

Answer 4

This was my solution, seems to be working for me.
#define kSwipeMinimumLength 0.2
- (void)touchesBeganWithEvent:(NSEvent *)event{
if(event.type == NSEventTypeGesture){
NSSet *touches = [event touchesMatchingPhase:NSTouchPhaseAny inView:self];
if(touches.count == 2){
self.twoFingersTouches = [[NSMutableDictionary alloc] init];
for (NSTouch *touch in touches) {
[self.twoFingersTouches setObject:touch forKey:touch.identity];
}
}
}
}
- (void)touchesMovedWithEvent:(NSEvent*)event {
NSSet *touches = [event touchesMatchingPhase:NSTouchPhaseEnded inView:self];
if(touches.count > 0){
NSMutableDictionary *beginTouches = [self.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]];
}
float sum = 0;
for (NSNumber *magnitude in magnitudes)
sum += [magnitude floatValue];
// 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
// This might need to be > (i am using flipped coordinates), you can use an else to go forward also.
if (sum > 0){
NSLog(#"go back");
}
}
}