UITouch touchesMoved Finger Direction and Speed - iphone

Question

How can I get Speed and Direction of finger movements in touchmoved function?
I want to get the finger speed and finger direction and apply it in a UIView class direction movement and animation speed.
I read this link but I can not understand the answer, in addition it is not explaining how I can detect the direction:
UITouch movement speed detection
so far, I tried this code:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *anyTouch = [touches anyObject];
CGPoint touchLocation = [anyTouch locationInView:self.view];
//NSLog(#"touch %f", touchLocation.x);
player.center = touchLocation;
[player setNeedsDisplay];
self.previousTimestamp = event.timestamp;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView:self.view];
CGPoint prevLocation = [touch previousLocationInView:self.view];
CGFloat distanceFromPrevious = [self distanceBetweenPoints:location :prevLocation];
NSTimeInterval timeSincePrevious = event.timestamp - previousTimestamp;
NSLog(#"diff time %f", timeSincePrevious);
}

Answer 1

Direction will be determined from the values of "location" and "prevLocation" in touchesMoved. Specifically, location will contain the new point of the touch. For example:
if (location.x - prevLocation.x > 0) {
//finger touch went right
} else {
//finger touch went left
}
if (location.y - prevLocation.y > 0) {
//finger touch went upwards
} else {
//finger touch went downwards
}
Now touchesMoved will get called many times for a given finger movement. It will be key to your code to compare an initial value when the finger first touches the screen, with a value of the CGPoint when the movement is finally complete.

Answer 2

why not just the below as a variation on obuseme's response
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *aTouch = [touches anyObject];
CGPoint newLocation = [aTouch locationInView:self.view];
CGPoint prevLocation = [aTouch previousLocationInView:self.view];
if (newLocation.x > prevLocation.x) {
//finger touch went right
} else {
//finger touch went left
}
if (newLocation.y > prevLocation.y) {
//finger touch went upwards
} else {
//finger touch went downwards
}
}