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view   statement

view tag, rect, wndTag

The view statement puts a new custom view in the current output window, or alters an existing view's characteristics.

tag A number (1 through 1000000) that you assign when you create the view and that you refer to when altering the view. The number you assign must be different from the tag value of all other existing widgets in the current window. A negative tag hides the view.
rect The view's enclosing rectangle. This can be specified in either of two ways:
(i) (x,y,w,h) where x,y are the origin and w,h the size of the view.
(ii) A CGRect value
wndTag An optional parameter for when the view's window is not the current output window. Note specifying this parameter does not bring the window to the front or make it the output window.
Dialog events (subclass only)
_viewDidChangeEffectiveAppearance // macOS 10.14+

Apple documentation