On 9 Nov 2010, at 3:31 AM, Dan Hopwood wrote: > Ok so I am working with MKAnnotations on my map view and want to know the * > correct* (i.e. the Apple intended) way to set up my custom annotation class > so that I can set the coordinate upon initialisation but also access the > coordinate attribute from outside the class e.g. in my case I wish to do > something like: > > region.center = myAnnotation.coordinate; > > The above gives me an error and says the assignment is between incompatible > types.
We need something better than "something like." Assuming "region" is an MKCoordinateRegion, and "myAnnotation" implements MKAnnotation, the above line is okay. But if "region" is your shorthand for "someMapView.region", you have a problem. Show us the code. > I've done plenty of googling and have seen a few different solutions but > none of which seemed to allow me to access the coordinate. Some people > define a coordinate member variable and then @property/synthesize. > Others named the member variable _coordinate and then *just* synthesized it > (not @property) using @synthesize _coordinate = coordinate; - I don't fully > understand what that means. Finally (in the case of the MapCallouts source) > others have defined a function called coordinate that returns the > coordinate. <MKAnnotation> already declares @property coordinate, so there is no reason to re-declare it. A -coordinate method, or a @synthesize if there is a "coordinate" instance variable to back it, is enough. > If someone could give tell me the correct solution by means of a really > simple example i.e. what should go in the .h and .m (I'm only interested in > the coordinate attribute for now) and then how to correctly access the > coordinate attribute from outside the class for assignment e.g. the center > attribute of the region object (sorry I can't remember the exact name). Don't do this by Braille from what I can tell you off the top of my head, or from cookbook examples. Read and understand for yourself the documentation on properties at <http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ObjectiveC/Articles/ocProperties.html>. — F _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
