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MKMapView   statement

mkmapview tag, rect, wndTag

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

Tlbx MapKit.incl header.

tag A number (1 through 1000000) that you assign when you create the mkmapview 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 mkmapview.
rect The mkmapview'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 mkmapview'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
_mapViewDidChangeVisibleRegion // macOS 10.13+
_mapViewClusterAnnotationForMemberAnnotations // macOS 10.13+


Apple documentation