所以我正在创建一个带有网格的应用程序,当我点击时会创建一个节点。现在,我正在使用PanGesture将节点拖放到网格中的其他位置。现在,我希望我拖动的节点更大(因此用户更容易看到),然后在删除时返回其大小。所以我用“panGesture.state == begin”来实现一个扩大节点的动画。但是,此动画仅在节点开始移动时才开始,而不是在我触摸它时。根据Apple API,
A pan gesture recognizer enters the began state as soon as the
**required amount of initial movement is achieved**
意味着在我开始拖动节点之前,我的节点不会更大。
有什么方法可以解决这个问题吗?
答案 0 :(得分:0)
您可以同时使用长按和平移手势识别器。请参阅代码示例。
class ViewController: UIViewController, UIGestureRecognizerDelegate {
var dragView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
self.dragView = UIView(frame: CGRect(x: 100.0, y: 100, width: 50.0, height: 50.0))
self.dragView.backgroundColor = UIColor.red
let panRecognizer = UIPanGestureRecognizer(target: self, action: #selector(pan))
panRecognizer.delegate = self
self.dragView.addGestureRecognizer(panRecognizer)
let pressRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(press))
pressRecognizer.minimumPressDuration = 0.0 // IMPORTANT
pressRecognizer.delegate = self
self.dragView.addGestureRecognizer(pressRecognizer)
self.view.addSubview(self.dragView)
}
@objc
func press(gestureRecognizer: UILongPressGestureRecognizer) {
switch gestureRecognizer.state {
case .began:
UIView.animate(withDuration: 0.1, animations: {
self.dragView.transform = CGAffineTransform(scaleX: 1.1, y: 1.1)
})
case .cancelled, .ended, .failed:
UIView.animate(withDuration: 0.1, animations: {
self.dragView.transform = CGAffineTransform.identity
})
default: break
}
}
@objc
func pan(gestureRecognizer: UIPanGestureRecognizer) {
switch gestureRecognizer.state {
case .changed:
var center = self.dragView.center
let translation = gestureRecognizer.translation(in: self.dragView)
center.x += translation.x
center.y += translation.y
self.dragView.center = center
gestureRecognizer.setTranslation(CGPoint.zero, in: self.dragView)
default: break
}
}
// MARK: UIGestureRecognizerDelegate
@objc
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer,
shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
return true // IMPORTANT
}
}
答案 1 :(得分:0)
在摇动手势中,.began表示开始移动而不是开始触摸。您必须重写func touchesBegan(_ touches:Set,带有事件:UIEvent?)函数以获得实际的触摸。