PYObjC NSWindow是NoneType？(PYObjC NSWindow is NoneType?)

PYObjC NSWindow是NoneType？(PYObjC NSWindow is NoneType?) window = NSApplication.sharedApplication().mainWindow() window.contentView().addSubview_(chart_view)

窗口是在另一个部分制作的，看起来很好，但我明白了：

：'NoneType'对象没有属性'contentView'

有谁知道为什么它认为窗口是“NoneType”？ 谢谢。

window = NSApplication.sharedApplication().mainWindow() window.contentView().addSubview_(chart_view)

The window was made in another section and appears fine but I get this:

: 'NoneType' object has no attribute 'contentView'

Does anyone know why it thinks the window is "NoneType"? Thankyou.

最满意答案

看起来mainWindow()返回None ，这表明没有活动窗口或类似的东西。

It looks like mainWindow() is returning None, which suggests that there is no active window or something like that.