iOS UIGestureRecognizer UISwipeGestureRecognizer
Example
Swipe gestures allow you to listen for the user moving their finger across the screen quickly in a certain direction.
Swift
override func viewDidLoad() {
super.viewDidLoad()
// Swipe (right and left)
let swipeRightGesture = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(_:)))
let swipeLeftGesture = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(_:)))
swipeRightGesture.direction = UISwipeGestureRecognizerDirection.Right
swipeLeftGesture.direction = UISwipeGestureRecognizerDirection.Left
swipeView.addGestureRecognizer(swipeRightGesture)
swipeView.addGestureRecognizer(swipeLeftGesture)
}
// Swipe action
func handleSwipe(gesture: UISwipeGestureRecognizer) {
label.text = "Swipe recognized"
// example task: animate view off screen
let originalLocation = swipeView.center
if gesture.direction == UISwipeGestureRecognizerDirection.Right {
label.text = "Swipe right"
} else if gesture.direction == UISwipeGestureRecognizerDirection.Left {
label.text = "Swipe left"
}
}
Objective-C
- (void)viewDidLoad
{
[super viewDidLoad];
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
// Setting the swipe direction.
[swipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
[swipeRight setDirection:UISwipeGestureRecognizerDirectionRight];
// Adding the swipe gesture on image view
[self.view addGestureRecognizer:swipeLeft];
[self.view addGestureRecognizer:swipeRight];
}
//Handling Swipe Gesture Events
- (void)handleSwipe:(UISwipeGestureRecognizer *)swipe {
if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
NSLog(@"Left Swipe");
}
if (swipe.direction == UISwipeGestureRecognizerDirectionRight) {
NSLog(@"Right Swipe");
}
}
Notes
- A fuller project example can be found here.
