我在 Playground 中创建一个场景,并使用 hitTest (func hitTest(_ point: CGPoint, options: [SCNHitTestOption : Any]? = nil) -> [SCNHitTestResult]) 函数来确定是否已触摸其中一个节点,但只有当节点被触摸时,它才会导致 Playground 中模拟器崩溃。使用 xcode 在 iOS 项目上使用相同的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
}
}
}
最佳答案
这在 Playground 中运行得真的、真的、真的很慢……但也许还有其他原因。无论如何,如果你用这个替换你的 func panGesture(sender: UIPanGestureRecognizer)
,它至少应该让你在 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
}
}
}
关于ios - SceneKit 中声明的 func hitTest 导致 Playground 崩溃,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42960892/