无法获取locationInView:尝试检索位置时出现此类型的NSTouch断言错误

问题描述

我正在尝试在用户单击特定的SCNNode之后检索鼠标位置.我最终希望执行一次命中测试，以确定单击了哪个SCNNode.我有以下代码，但是一旦运行项目，我就会得到一个断言错误，指出:无法获得locationInView:对于这种类型的NSTouch".任何帮助将不胜感激.

I'm trying to retrieve the mouse location after a user clicks on a specific SCNNode. I eventually want to perform a hit test to determine which SCNNode was clicked. I have the following code but once I run the project I get an assertion error stating: "Cannot get locationInView: for this type of NSTouch". Any help would be appreciated.

override func touchesBegan(with event: NSEvent) {
    let touch = event.touches(for: self.view)
    if #available(OSX 10.12.2, *) {
        let location = touch.first?.location(in: self.view)
        let hitResults = sceneView.hitTest(location!, options: nil)

    } else {
        // Fallback on earlier versions
    }
}

推荐答案

-locationInView: 仅适用于 type NSTouchTypeDirect .如果您的Mac带有触摸栏，则按下它会导致触摸类型为 NSTouchTypeIndirect ，它在屏幕上没有位置.

-locationInView: will only work for touches of type NSTouchTypeDirect. If you have a Mac with a Touch Bar, pressing it will lead to an event with a touch of type NSTouchTypeIndirect which has no location on the screen.

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