Question

我在游乐场创建一个场景并使用hitTest（func hitTest（_ point：CGPoint，options：[SCNHitTestOption：Any]？= nil） - ＆gt; [SCNHitTestResult]）函数来确定其中一个节点是否被触摸过，但只有在触摸节点时才会导致模拟器在操场上崩溃。使用xcode的iOS项目中的相同代码不会发生这种情况。

func panGesture(sender: UIPanGestureRecognizer) {
    sender.view

    let translation = sender.translation(in: sender.view!)

    var newAngleX = (Float)(translation.y)*(Float)(M_PI)/180.0
    newAngleX += currentXAngle
    var newAngleY = (Float)(translation.x)*(Float)(M_PI)/180.0
    newAngleY += currentYAngle

    if (sender.numberOfTouches>0){

        var point = sender.location(in: self)

        print(point)

        let hit = self.hitTest(point, options: nil)

        let node = hit.first?.node

        node?.eulerAngles.x = newAngleX
        node?.eulerAngles.y = newAngleY

        if(sender.state == UIGestureRecognizerState.ended) {
            currentXAngle = newAngleX
            currentYAngle = newAngleY
        }

    }

}

Answer 1

这在游乐场真的非常非常慢......但也许还有别的东西在继续。无论如何，如果你用这个替换你的func panGesture(sender: UIPanGestureRecognizer)，至少应该让你在Playground中运行它而不会崩溃。

func panGesture(sender: UIPanGestureRecognizer) {
    sender.view

    let translation = sender.translation(in: sender.view!)

    var newAngleX = (Float)(translation.y)*(Float)(M_PI)/180.0
    newAngleX += currentXAngle
    var newAngleY = (Float)(translation.x)*(Float)(M_PI)/180.0
    newAngleY += currentYAngle

    let point = sender.location(in: self)
    print(point)

    // important
    guard let hit = self.hitTest(point, options: nil) as? [SCNHitTestResult] else { return }

    // and, don't go in here if hit.count == 0, because it won't have a .first
    if (sender.numberOfTouches > 0 && hit.count > 0){

        let node = hit.first?.node

        node?.eulerAngles.x = newAngleX
        node?.eulerAngles.y = newAngleY

        if(sender.state == UIGestureRecognizerState.ended) {
            currentXAngle = newAngleX
            currentYAngle = newAngleY
        }

    }

}

在SceneKit中声明的func hitTest会导致Playground崩溃

1 个答案: