特定手势的同时手势识别

Question

我正在尝试启用同时手势识别，但仅适用于 UIPinchGestureRecognizer 和 UIRotationGestureRecognizer 手势。我不希望它适用于任何其他手势。如果我将以下属性设置为 true，它允许同时识别所有手势，如何将其限制为仅旋转和缩放？

func gestureRecognizer(UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer: UIGestureRecognizer) -> Bool {
    return true
}

Answer 1

确保你的类实现UIGestureRecognizerDelegate

class YourViewController: UIViewController, UIGestureRecognizerDelegate ...

---

将手势的delegate设置为self

yourGesture.delegate = self

---

为您的班级添加委托功能

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    if (gestureRecognizer is UIPanGestureRecognizer || gestureRecognizer is UIRotationGestureRecognizer) {
        return true
    } else {
        return false
    }
}

Answer 2

swift 5.1 任意 2 美分

// 假设您需要更喜欢捏而不是平移：

//UIGestureRecognizerDelegate
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith shouldRecognizeSimultaneouslyWithGestureRecognizer: UIGestureRecognizer) -> Bool {

        if gestureRecognizer is UIPinchGestureRecognizer {
            return true
        }
        return false
    }