How to get current touch point and previous touch point in UIPanGestureRecognizer method?

You can use this:

CGPoint currentlocation = [recognizer locationInView:self.view];

Store previous location by setting current location if not found and adding current location everytime.

previousLocation = [recognizer locationInView:self.view]; 

When you link an UIPanGestureRecognizer to an IBAction, the action will get called on every change. The gesture recognizer also provides a property called state which indicates if it's the first UIGestureRecognizerStateBegan, the last UIGestureRecognizerStateEnded or just an event between UIGestureRecognizerStateChanged.

To solve your problem, try it like the following:

- (IBAction)panGestureMoveAround:(UIPanGestureRecognizer *)gesture {
    if ([gesture state] == UIGestureRecognizerStateBegan) {
        myVarToStoreTheBeganPosition = [gesture locationInView:self.view];
    } else if ([gesture state] == UIGestureRecognizerStateEnded) {
       CGPoint myNewPositionAtTheEnd = [gesture locationInView:self.view];
       // and now handle it ;)
    }
}

You may also have a look at the method called translationInView:.

If you don't want to store anything you can also do this :

let location = panRecognizer.location(in: self)
let translation = panRecognizer.translation(in: self)
let previousLocation = CGPoint(x: location.x - translation.x, y: location.y - translation.y)