2014/10/15 下午 10:10:11

iphone Programming Glossary: imagereference

How to display an image on a MKOverlayView?

http://stackoverflow.com/questions/3891850/how-to-display-an-image-on-a-mkoverlayview

radarOverlay RadarOverlay self.overlay UIImage image UIImage alloc initWithData radarOverlay.radarData CGImageRef imageReference image.CGImage MKMapRect theMapRect self.overlay boundingMapRect CGRect theRect self rectForMapRect theMapRect CGRect clipRect.. @ RadarTransparency CGContextAddRect context clipRect CGContextClip context CGContextDrawImage context theRect imageReference image release When I download the image I flip the image so it can be easily drawn in the MKOverlayView size_t width CGImageGetWidth.. When I download the image I flip the image so it can be easily drawn in the MKOverlayView size_t width CGImageGetWidth imageReference self.scaleFactor size_t height CGImageGetHeight imageReference self.scaleFactor Calculate colorspace for the specified image..

How do I create an image overlay and add to MKMapView?

http://stackoverflow.com/questions/5283741/how-do-i-create-an-image-overlay-and-add-to-mkmapview

MKZoomScale zoomScale inContext CGContextRef ctx UIImage image UIImage imageNamed @ image.png retain CGImageRef imageReference image.CGImage MKMapRect theMapRect self.overlay boundingMapRect CGRect theRect self rectForMapRect theMapRect CGRect clipRect.. clipRect self rectForMapRect mapRect CGContextAddRect ctx clipRect CGContextClip ctx CGContextDrawImage ctx theRect imageReference image release @end Add the overlay to the MKMapView MapOverlay mapOverlay MapOverlay alloc init mapView addOverlay mapOverlay..