Why a MKPolyline doesn't show on the MKMapView?

Why a MKPolyline doesn't show on the MKMapView?

References

Reference NO 1

http://stackoverflow.com/questions/13643310/why-a-mkpolyline-doesnt-show-on-the-mkmapview

Reference NO 2

http://stackoverflow.com/questions/14618994/hide-show-mkpolyline-with-a-particular-title

Reference NO 3

http://stackoverflow.com/questions/14813580/draw-and-update-mkpolyline-on-a-mapview

Reference NO 4

http://stackoverflow.com/questions/15688055/mkmapview-overlays-redrawblink-when-adding-new-overlays-mkpolylines-are-jagge

Reference NO 5

http://stackoverflow.com/questions/5682688/gradient-mkoverlay-on-mkmapview-iphone

Reference NO 6

#EANF#

Reference NO 7

#EANF#

Reference NO 8

#EANF#