A note on Objective-C singletons - Luke Redpath
Jul 01, 2011 A note on Objective-C singletons I'm not a big fan of singletons, especially when they are used as they often are - as glorified globals. That being said, it occasionally makes sense to have some kind of shared instance of an object; not a true singleton that strictly prevents more than one allocation, but a convenient default instance. Apple uses this pattern frequently throughout th
NSString @property, using copy instead of retain
I'm looking over Apple's sample application EditableDetailView, and noticed that in one of their controllers, they're setting an instance of NSString property with (nonatomic, copy). When would one use copy instead of retain? Is this so they can make a unique copy without affecting the existing data?
Cocoaの日々: [iOS][Mac] dispatch_once を使ったシングルトン
iOS/iPhone/iPad/MacOSX プログラミング, Objective-C, Cocoaなど [元ネタ] Cocoa Samurai: Singletons: You're doing them wrong GCD の dispatch_once 関数を使うとスレッドセーフなシングルトンの初期化処理をこんな感じで書ける。 static LKLocationManager* sharedManager_ = nil; + (LKLocationManager*)sharedManager { static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ sharedManager_ = [[LKLocationManager alloc] init]; }); return sharedManager_; }disp
![Cocoaの日々: [iOS][Mac] dispatch_once を使ったシングルトン](https://cdn-ak-scissors.b.st-hatena.com/image/square/ca01a2982562f29e16f7b3d283897888ffd95053/height=288;version=1;width=512/https%3A%2F%2Fblogger.googleusercontent.com%2Fimg%2Fb%2FR29vZ2xl%2FAVvXsEhCM7s-tV2KJkZ49JHeI2nZsG0xKtmNae7JMrcYvZpfDy_rkmHBGENiBl_Q-5BY_eNbNpun0gAyjFsLcCVikKE-sDwwGuqOFvqm8i_CxKr3HMlBpu_WZy1CkcMTC2Fon9j8FrJEGsLh3iuO%2Fs320%2F110509-0001.jpg)
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