Instance member cannot be used on type

Question

I have the following class:

class ReportView: NSView {  
    var categoriesPerPage = [[Int]]()
    var numPages: Int = { return categoriesPerPage.count }
}
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Answer 1

Sometimes Xcode when overrides methods adds class func instead of just func. Then in static method you can't see instance properties. It is very easy to overlook it. That was my case.