ios - synthesizing properties with trailing underscore -


this question has answer here:

i'm following along lynda.com ocunit testing tutorial uses xcode 4. in 1 of demos, synthesizes properties in location.m file this

#import "location.h"  @implementation location  @synthesize locationmanager=locationmanager_; @synthesize speed=speed_;

the properties have trailing underscore. in other tutorials i've followed (such stanford ios class), synthesized properties prefixed underscore instance variables.

when properties created in .h file, there no underscores.

@property (nonatomic, strong) cllocationmanager *locationmanager; @property float speed;

why trailing underscore in synthesize statement?

by writing 

@synthesize locationmanager=locationmanager_;

you defining ivar locationmanager_which backs property.

so, property still refer using

self.locationmanager

however, ivar, "behind" property called: locationmanager_


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