SynthesizeSingleton.h，Object-c单例宏

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// 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_HEADER(className) \
\
+ (className *)shared##className;

#define SYNTHESIZE_SINGLETON_FOR_CLASS(className) \
\
+ (className *)shared##className { \
static className *shared##className = nil; \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \
shared##className = [[self alloc] init]; \
}); \
return shared##className; \
}

#define SYNTHESIZE_SINGLETON_FOR_CLASS_INITMETHODS(className) \
\
+ (className *)shared##className { \
static className *shared##className = nil; \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \
shared##className = [[self alloc] init]; \
[shared##className initConfig];\
}); \
return shared##className; \
}

以上为SynthesizeSingleton.h内容。

使用方法：（1）在类的h文件中添加 SYNTHESIZE_SINGLETON_FOR_HEADER(单例类)

（2）在类的m文件中添加 SYNTHESIZE_SINGLETON_FOR_CLASS_INITMETHODS(单例类);

（3）这样这个类就成为单例类，调用时直接使用[### shared###]；

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