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7734958eec
// FREEBIE
68 lines
1.8 KiB
Swift
68 lines
1.8 KiB
Swift
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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import UIKit.UIGestureRecognizerSubclass
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@objc
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enum PanDirection: Int {
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case left, right, up, down, any
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}
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@objc
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class PanDirectionGestureRecognizer: UIPanGestureRecognizer {
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let direction: PanDirection
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init(direction: PanDirection, target: AnyObject, action: Selector) {
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self.direction = direction
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super.init(target: target, action: action)
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}
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override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent) {
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// Only start gesture if it's initially in the specified direction.
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if state == .possible {
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guard let touch = touches.first else {
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return
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}
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let previousLocation = touch.previousLocation(in: view)
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let location = touch.location(in: view)
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let deltaY = previousLocation.y - location.y
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let deltaX = previousLocation.x - location.x
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switch direction {
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case .up where deltaY > 0:
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return
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case .down where deltaY < 0:
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return
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case .left where deltaX > 0:
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return
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case .right where deltaX < 0:
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return
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default:
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break
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}
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}
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// Gesture was already started, or in the correct direction.
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super.touchesMoved(touches, with: event)
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if state == .began {
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let vel = velocity(in: view)
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switch direction {
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case .left, .right:
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if fabs(vel.y) > fabs(vel.x) {
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state = .cancelled
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}
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case .up, .down:
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if fabs(vel.x) > fabs(vel.y) {
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state = .cancelled
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}
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default:
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break
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}
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}
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}
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}
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