我正在尝试为SwiftOSXOpenGL应用程序创建一个主渲染循环,但我在网络上找不到任何示例,也无法弄清楚与ObjectiveCAPI的交互。这是我的NSOpenGLView子类初始化期间的代码:varudl:Unmanaged?CVDisplayLinkCreateWithActiveCGDisplays(&udl)vardisplayLink:CVDisplayLink=udl!.takeRetainedValue()//Iguess//Thetwofollowinglinesgiveerrorsthatthetypeisn'tconvertible//tothedeclared