我试图让 UISwipeGestureRecognizer 在 Swift 3 中工作,默认的向右滑动工作正常,但不是向上或向左滑动。
我试过控制拖动一个Action
@IBAction func hole(_ recognizer: UISwipeGestureRecognizer) {
if (recognizer.direction == UISwipeGestureRecognizerDirection.left)
{
print("left")
}else if recognizer.direction == .right {
print("right")
}else {
print("other")
}
}
并且,在 ViewDidLoad 中
//gesture recognisers
let swipeRight = UISwipeGestureRecognizer(target: self, action: "holeSwiped:")
swipeRight.direction = UISwipeGestureRecognizerDirection.right
self.view.addGestureRecognizer(swipeRight)
let swipeLeft = UISwipeGestureRecognizer(target: self, action: "holeSwiped:")
swipeLeft.direction = UISwipeGestureRecognizerDirection.left
self.view.addGestureRecognizer(swipeLeft)
我的方法
func holeSwiped(gesture: UISwipeGestureRecognizer)
{
if let swipeGesture = gesture as? UISwipeGestureRecognizer{
switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.right:
print("right swipe")
case UISwipeGestureRecognizerDirection.left:
print("left swipe")
default:
print("other swipe")
}
}
}
现在,除了默认的右滑动操作外,所有滑动操作都不起作用。有什么想法吗?
最佳答案
第 1 步:在 viewDidLoad() 方法中添加滑动手势。
override func viewDidLoad() {
super.viewDidLoad()
let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(handleGesture))
swipeLeft.direction = .left
self.view.addGestureRecognizer(swipeLeft)
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(handleGesture))
swipeRight.direction = .right
self.view.addGestureRecognizer(swipeRight)
let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(handleGesture))
swipeUp.direction = .up
self.view.addGestureRecognizer(swipeUp)
let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(handleGesture))
swipeDown.direction = .down
self.view.addGestureRecognizer(swipeDown)
}
第二步:检查handleGesture()方法中的手势检测
func handleGesture(gesture: UISwipeGestureRecognizer) {
if gesture.direction == .right {
print("Swipe Right")
}
else if gesture.direction == .left {
print("Swipe Left")
}
else if gesture.direction == .up {
print("Swipe Up")
}
else if gesture.direction == .down {
print("Swipe Down")
}
}
我希望这会对某人有所帮助。
更新:
您需要使用@objc 为最新的swift 版本调用您的“选择器”方法。 即,
@objc func handleGesture(gesture: UISwipeGestureRecognizer) -> Void {
.
.
.
}
关于swift - Swift 3 中的滑动手势,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39764088/