单例模板一则

参考我上一篇转载的博文，我对单例模板做出了一些修改，用起来的话会变得更加方便一点：

// // SynthesizeSingleton.h // CocoaWithLove // // Created by Matt Gallagher on 20/10/08. // Copyright 2009 Matt Gallagher. All rights reserved. // // Permission is given to use this source code file without charge in any // project, commercial or otherwise, entirely at your risk, with the condition // that any redistribution (in part or whole) of source code must retain // this copyright and permission notice. Attribution in compiled projects is // appreciated but not required. // #define SYNTHESIZE_SINGLETON_FOR_CLASS(classname) \ \ static classname *instance = nil; \ \ + (classname *)getInstance \ { \ @synchronized(self) \ { \ if (instance == nil) \ { \ instance = [[self alloc] init]; \ } \ } \ \ return instance; \ } \ \ + (id)allocWithZone:(NSZone *)zone \ { \ @synchronized(self) \ { \ if (instance == nil) \ { \ instance = [super allocWithZone:zone]; \ return instance; \ } \ } \ \ return nil; \ } \ \ - (id)copyWithZone:(NSZone *)zone \ { \ return self; \ } \ \ - (id)retain \ { \ return self; \ } \ \ - (NSUInteger)retainCount \ { \ return NSUIntegerMax; \ } \ \ - (void)release \ { \ } \ \ - (id)autorelease \ { \ return self; \ }

有了上面的宏模板，就再也不用机械化的多次复制粘贴以下代码了：

/** *单例~ */ +(AudioManager*) getInstance { staticAudioManager*instance; @synchronized(self) { if(!instance) { instance = [[selfalloc]init]; } } returninstance; }

其实本质来说，还是粘贴复制，不过现在只要复制粘贴一句了

SYNTHESIZE_SINGLETON_FOR_CLASS(AudioManager)