如何识别所有4个方向的滑动
我需要使用滑动来识别滑动手势，然后右键。 但在迅速的UISwipeGestureRecognizer已经预先确定了正确的方向..我不知道如何使这个使用其他方向..
您需要为每个方向都有一个UISwipeGestureRecognizer 。 这UISwipeGestureRecognizer.direction因为UISwipeGestureRecognizer.direction属性是一个选项样式的位掩码，但是每个识别器只能处理一个方向。 你可以把它们全部发送给同一个处理程序，然后把它们整理出来，或者发送给不同的处理程序。 这里有一个实现：
override func viewDidLoad() { super.viewDidLoad() var swipeRight = UISwipeGestureRecognizer(target: self, action: "respondToSwipeGesture:") swipeRight.direction = UISwipeGestureRecognizerDirection.Right self.view.addGestureRecognizer(swipeRight) var swipeDown = UISwipeGestureRecognizer(target: self, action: "respondToSwipeGesture:") swipeDown.direction = UISwipeGestureRecognizerDirection.Down self.view.addGestureRecognizer(swipeDown) } func respondToSwipeGesture(gesture: UIGestureRecognizer) { if let swipeGesture = gesture as? UISwipeGestureRecognizer { switch swipeGesture.direction { case UISwipeGestureRecognizerDirection.Right: print("Swiped right") case UISwipeGestureRecognizerDirection.Down: print("Swiped down") case UISwipeGestureRecognizerDirection.Left: print("Swiped left") case UISwipeGestureRecognizerDirection.Up: print("Swiped up") default: break } } }
Swift 3：
override func viewDidLoad() { super.viewDidLoad() let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(self.respondToSwipeGesture)) swipeRight.direction = UISwipeGestureRecognizerDirection.right self.view.addGestureRecognizer(swipeRight) let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(self.respondToSwipeGesture)) swipeDown.direction = UISwipeGestureRecognizerDirection.down self.view.addGestureRecognizer(swipeDown) } func respondToSwipeGesture(gesture: UIGestureRecognizer) { if let swipeGesture = gesture as? UISwipeGestureRecognizer { switch swipeGesture.direction { case UISwipeGestureRecognizerDirection.right: print("Swiped right") case UISwipeGestureRecognizerDirection.down: print("Swiped down") case UISwipeGestureRecognizerDirection.left: print("Swiped left") case UISwipeGestureRecognizerDirection.up: print("Swiped up") default: break } } }
我只是觉得自己做出了贡献，最终看起来更优雅：
func addSwipe() { let directions: [UISwipeGestureRecognizerDirection] = [.Right, .Left, .Up, .Down] for direction in directions { let gesture = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipe:")) gesture.direction = direction self.addGestureRecognizer(gesture) } } func handleSwipe(sender: UISwipeGestureRecognizer) { print(sender.direction) }
从故事板：
- 添加四个滑动手势识别器到您的视图。
- 使用属性检查器中的目标方向设置每个对象。 您可以select右，左，上或下
- 一个接一个，select滑动手势识别器，控制+拖动到你的视图控制器。 插入名称（让我们说leftGesture，rightGesture，upGesture和downGesture），将连接更改为：操作并键入到：UISwipeGestureRecognizer
从你的viewController：
@IBAction func rightGesture(sender: UISwipeGestureRecognizer) { print ("Right") } @IBAction func leftGesture(sender: UISwipeGestureRecognizer) { print ("Left") } @IBAction func upGesture(sender: UISwipeGestureRecognizer) { print = ("Up") } @IBAction func downGesture(sender: UISwipeGestureRecognizer) { print ("Down") }
看起来事情最近已经改变了。 在XCode 7.2中，以下方法工作：
override func viewDidLoad() { super.viewDidLoad() let swipeGesture = UISwipeGestureRecognizer(target: self, action: "handleSwipe:") swipeGesture.direction = [.Down, .Up] self.view.addGestureRecognizer(swipeGesture) } func handleSwipe(sender: UISwipeGestureRecognizer) { print(sender.direction) }
在iOS 8.4和9.2的模拟器上以及9.2上的实际设备上进行testing。
或者， 在这里使用mlcollard的方便扩展：
let swipeGesture = UISwipeGestureRecognizer() { print("Gesture recognized !") } swipeGesture.direction = [.Down, .Up] self.view.addGestureRecognizer(swipeGesture)
Apple Swift 3.1版 – Xcode版本8.3（8E162）
从亚历山大卡萨涅的方法方便的方式
let directions: [UISwipeGestureRecognizerDirection] = [.up, .down, .right, .left] for direction in directions { let gesture = UISwipeGestureRecognizer(target: self, action: #selector(YourClassName.handleSwipe(gesture:))) gesture.direction = direction self.view?.addGestureRecognizer(gesture) } func handleSwipe(gesture: UISwipeGestureRecognizer) { print(gesture.direction) switch gesture.direction { case UISwipeGestureRecognizerDirection.down: print("down swipe") case UISwipeGestureRecognizerDirection.up: print("up swipe") case UISwipeGestureRecognizerDirection.left: print("left swipe") case UISwipeGestureRecognizerDirection.right: print("right swipe") default: print("other swipe") } }
UISwipeGestureRecognizer的direction属性具有以下定义：
var direction: UISwipeGestureRecognizerDirection
此手势识别器的滑动的允许方向。
Swift 3.0.1（及以下）的问题是，即使UISwipeGestureRecognizerDirection符合OptionSet ，下面的代码片段也会被编译，但不会产生任何积极的预期结果：
// This compiles but does not work let gesture = UISwipeGestureRecognizer(target: self, action: #selector(gestureHandler)) gesture.direction = [.right, .left, .up, .down] self.addGestureRecognizer(gesture)
作为解决方法，您将不得不为每个所需的direction创build一个UISwipeGestureRecognizer 。
下面的Playground代码显示了如何使用Array的map方法为同一个UIView和相同的selector实现多个UISwipeGestureRecognizer ：
import UIKit import PlaygroundSupport class SwipeableView: UIView { convenience init() { self.init(frame: CGRect(x: 100, y: 100, width: 100, height: 100)) backgroundColor = .red [UISwipeGestureRecognizerDirection.right, .left, .up, .down].map({ let gesture = UISwipeGestureRecognizer(target: self, action: #selector(gestureHandler)) gesture.direction = $0 self.addGestureRecognizer(gesture) }) } func gestureHandler(sender: UISwipeGestureRecognizer) { switch sender.direction { case [.left]: frame.origin.x -= 10 case [.right]: frame.origin.x += 10 case [.up]: frame.origin.y -= 10 case [.down]: frame.origin.y += 10 default: break } } } class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() view.backgroundColor = .white view.addSubview(SwipeableView()) } } let controller = ViewController() PlaygroundPage.current.liveView = controller
它可以通过简单地声明一个函数来处理你所有的滑动UISwipeGestureRecognizer的方向，这里是我的代码
let swipeGestureRight = UISwipeGestureRecognizer(target: self, action:#selector(ViewController.respondToSwipeGesture(_:)) ) swipeGestureRight.direction = UISwipeGestureRecognizerDirection.right self.view .addGestureRecognizer(swipeGestureRight) let swipeGestureLeft = UISwipeGestureRecognizer(target: self, action: #selector(ViewController.respondToSwipeGesture(_:))) swipeGestureLeft.direction = UISwipeGestureRecognizerDirection.left self.view.addGestureRecognizer(swipeGestureLeft) let swipeGestureUp = UISwipeGestureRecognizer(target: self, action: #selector(ViewController.respondToSwipeGesture(_:))) swipeGestureUp.direction = UISwipeGestureRecognizerDirection.up self.view.addGestureRecognizer(swipeGestureUp) let swipeGestureDown = UISwipeGestureRecognizer(target: self, action: #selector(ViewController.respondToSwipeGesture(_:))) swipeGestureDown.direction = UISwipeGestureRecognizerDirection.down self.view.addGestureRecognizer(swipeGestureDown)
这里是涉及swipedirectionfunction的function
func respondToSwipeGesture（_ sender：UIGestureRecognizer）{
if let swipeGesture = sender as? UISwipeGestureRecognizer { switch swipeGesture.direction { case UISwipeGestureRecognizerDirection.right: print("right swipe") case UISwipeGestureRecognizerDirection.left: print("leftSwipe") case UISwipeGestureRecognizerDirection.up: print("upSwipe") case UISwipeGestureRecognizerDirection.down: print("downSwipe") default: break } }
}
Nate的答案只是一个更酷的语法：
[UISwipeGestureRecognizerDirection.right, UISwipeGestureRecognizerDirection.left, UISwipeGestureRecognizerDirection.up, UISwipeGestureRecognizerDirection.down].forEach({ direction in let swipe = UISwipeGestureRecognizer(target: self, action: #selector(self.respondToSwipeGesture)) swipe.direction = direction self.view.addGestureRecognizer(swipe) })
使用起来很简单，请按照下面的代码进行操作，享受…👇🏻
//SwipeGestureMethodUsing func SwipeGestureMethodUsing () { //AddSwipeGesture [UISwipeGestureRecognizerDirection.right, UISwipeGestureRecognizerDirection.left, UISwipeGestureRecognizerDirection.up, UISwipeGestureRecognizerDirection.down].forEach({ direction in let swipe = UISwipeGestureRecognizer(target: self, action: #selector(self.respondToSwipeGesture)) swipe.direction = direction window?.addGestureRecognizer(swipe) }) } //respondToSwipeGesture func respondToSwipeGesture(gesture: UIGestureRecognizer) { if let swipeGesture = gesture as? UISwipeGestureRecognizer { switch swipeGesture.direction { case UISwipeGestureRecognizerDirection.right: print("Swiped right") case UISwipeGestureRecognizerDirection.down: print("Swiped down") case UISwipeGestureRecognizerDirection.left: print("Swiped left") case UISwipeGestureRecognizerDirection.up: print("Swiped up") default: break } } }
快乐编码😊
