UISwipeGestureRecognizer Swipe length
In Swift
override func viewDidLoad() {
super.viewDidLoad()
// add your pan recognizer to your desired view
let panRecognizer = UIPanGestureRecognizer(target: self, action: #selector(panedView))
self.view.addGestureRecognizer(panRecognizer)
}
@objc func panedView(sender:UIPanGestureRecognizer){
var startLocation = CGPoint()
//UIGestureRecognizerState has been renamed to UIGestureRecognizer.State in Swift 4
if (sender.state == UIGestureRecognizer.State.began) {
startLocation = sender.location(in: self.view)
}
else if (sender.state == UIGestureRecognizer.State.ended) {
let stopLocation = sender.location(in: self.view)
let dx = stopLocation.x - startLocation.x;
let dy = stopLocation.y - startLocation.y;
let distance = sqrt(dx*dx + dy*dy );
NSLog("Distance: %f", distance);
if distance > 400 {
//do what you want to do
}
}
}
Hope that helps all you Swift pioneers
It's impossible to get a distance from a swipe gesture, because the SwipeGesture triggers the method where you could access the location exactly one time, when the gesture has ended.
Maybe you want to use a UIPanGestureRecognizer.
If it possible for you to use pan gesture you would save the starting point of the pan, and if the pan has ended calculate the distance.
- (void)panGesture:(UIPanGestureRecognizer *)sender {
if (sender.state == UIGestureRecognizerStateBegan) {
startLocation = [sender locationInView:self.view];
}
else if (sender.state == UIGestureRecognizerStateEnded) {
CGPoint stopLocation = [sender locationInView:self.view];
CGFloat dx = stopLocation.x - startLocation.x;
CGFloat dy = stopLocation.y - startLocation.y;
CGFloat distance = sqrt(dx*dx + dy*dy );
NSLog(@"Distance: %f", distance);
}
}