重载手势识别器应以swift中的UIPangestureRecognitor开头

我有一个平移手势，我需要检查这个手势何时开始。在objective-C中，您可以使用

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer

使用UIPangestureRecognitor可能会过载

- (BOOL)gestureRecognizerShouldBegin:(UIPanGestureRecognizer *)gestureRecognizer

但是迅速地

override func gestureRecognizerShouldBegin(gestureRecognizer: UIPanGestureRecognizer) -> Bool {

它不起作用，又回来了

使用选择器“GestureRecognitzerShouldBegin:”重写的方法具有不兼容的类型“（UIPangestureRecognitzer）->Bool”

---

如何在swift中重载此方法？

删除覆盖，并且不要忘记添加UIGestureRecognitizerDelegate扩展

您可以将其添加到类的底部

class YourViewController: UIViewController {
    // You class declaration
}

extension YourViewController: UIGestureRecognizerDelegate {
    func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
        //
        return true
    }
}

---

删除覆盖，不要忘记添加UIgestureRecognitizerDelegate扩展

您可以将其添加到类的底部

class YourViewController: UIViewController {
    // You class declaration
}

extension YourViewController: UIGestureRecognizerDelegate {
    func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
        //
        return true
    }
}

---

您不需要重载该方法，可以改为：

override func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
    if let panGesture = gestureRecognizer as? UIPanGestureRecognizer {
        return ...
    }
    else {
        return ...
    }
}

---

您不需要重载该方法，可以改为：

override func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
    if let panGesture = gestureRecognizer as? UIPanGestureRecognizer {
        return ...
    }
    else {
        return ...
    }
}

---

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