我需要使用滑动来识别先向下再向右滑动的手势。但是在 swift UISwipeGestureRecognizer 上有预先确定的正确方向..我不知道如何让它用于其他方向..
最佳答案
每个方向都需要一个 UISwipeGestureRecognizer
。这有点奇怪,因为 UISwipeGestureRecognizer.direction
属性是一个选项样式的位掩码,但每个识别器只能处理一个方向。如果需要,您可以将它们全部发送给同一个处理程序,然后在那里进行排序,或者将它们发送给不同的处理程序。这是一种实现方式:
override func viewDidLoad() {
super.viewDidLoad()
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(respondToSwipeGesture))
swipeRight.direction = .right
self.view.addGestureRecognizer(swipeRight)
let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(respondToSwipeGesture))
swipeDown.direction = .down
self.view.addGestureRecognizer(swipeDown)
}
@objc func respondToSwipeGesture(gesture: UIGestureRecognizer) {
if let swipeGesture = gesture as? UISwipeGestureRecognizer {
switch swipeGesture.direction {
case .right:
print("Swiped right")
case .down:
print("Swiped down")
case .left:
print("Swiped left")
case .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
}
}
}
关于ios - 如何识别所有 4 个方向的滑动,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24215117/