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POsingleton class in objective-C
 

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    <p>I want to have one object that is initialized in the delegate and I want to be able to use this object anywhere across view controllers (doesn't depend on what view I am currently at). I am guessing the solution to this would be to have a singleton class, so far I have the following:</p> <pre><code>@interface LocationManager : NSObject &lt;CLLocationManagerDelegate&gt;{ NSDate *enter; NSDate *exit; CLLocationManager * manager; } @property (nonatomic, retain) NSDate * enter; @property (nonatomic, retain) NSDate * exit; - (BOOL)registerRegionWithLatitude:(double)latitude andLongitude:(double)longitude; + (LocationManager *)instance; @end #import "LocationManager.h" @implementation LocationManager @synthesize enter; @synthesize exit; #pragma mark - CLLocationManager delegate static LocationManager *gInstance = NULL; + (LocationManager *)instance { @synchronized(self) { if (gInstance == NULL) gInstance = [[self alloc] init]; } return(gInstance); } @end </code></pre> <p>Is this correct? So all I need to do to access this is just to call instance? Inside LocationManager I also want to have only one CLLocationManager, called manager.. however, where do I initialize it so I only have one? Can I do the following? Most other singleton examples doesn't have any variables in the class, so that's where I got confused</p> <pre><code>+ (LocationManager *)sharedLocationManager { @synchronized(self) { if (lm == NULL){ lm = [[self alloc] init]; lm.manager = [[CLLocationManager alloc] init]; lm.manager.delegate = lm; } } return(lm); } </code></pre>
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    2. COI would name it `sharedLocationManager` instead of `instance`. Apple name them this way (except for `NSNull` and `NSUserDefaults`, but these are special).
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