[英]Pinch gesture does not work if view registers pan gesture
我有一個用手勢操縱視圖的應用程序。 視圖與平移、捏合和旋轉手勢有關。 如果我開始用兩個手指與視圖交互,則所有手勢都同時工作(預期行為)。 但是,如果您從一個手指平移開始,則捏合和旋轉手勢不起作用。 當我嘗試在平移時開始捏合或旋轉時,不會調用委托中的任何方法。
shouldRecognizeSimultaneouslyWith
永遠是真的。
預期行為,
從一個干凈的項目中,我添加了以下內容:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
view.addGestureRecognizer({
let gesture = UIPanGestureRecognizer(target: self, action: #selector(onPan))
gesture.delegate = self
return gesture
}())
view.addGestureRecognizer({
let gesture = UIPinchGestureRecognizer(target: self, action: #selector(onPinch))
gesture.delegate = self
return gesture
}())
view.addGestureRecognizer({
let gesture = UIRotationGestureRecognizer(target: self, action: #selector(onRotate))
gesture.delegate = self
return gesture
}())
}
@objc private func onPan(_ sender: UIPanGestureRecognizer) {
print("Did pan to \(sender.translation(in: sender.view))")
}
@objc private func onPinch(_ sender: UIPinchGestureRecognizer) {
print("Did pinch to \(sender.scale)")
}
@objc private func onRotate(_ sender: UIRotationGestureRecognizer) {
print("Did rotate to: \(sender.rotation)")
}
}
extension ViewController: UIGestureRecognizerDelegate {
func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool { true }
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool { true }
}
在您描述的場景之后,所有 3 種方法都會報告更改:
這個例子對你不起作用嗎? 您正在經歷的行為是什么以及預期的行為是什么?
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