#ifndef RadishNinja_Singleton_h #define RadishNinja_Singleton_h// 單例聲明(在@interface中) #define SingletonDeclare(className)\ +(className*) singleton// 單例實現(@implementation中) #define SingletionImplement(className) \ static className* _shared##className = nil; \ +(className*) singleton \ { \@synchronized([className class]) \{ \if (!_shared##className) \[[className alloc] init]; \\return _shared##className; \} \\return nil; \ } \\ +(id)alloc\ { \@synchronized([className class]) \{ \NSAssert(_shared##className == nil, @"Attempted to allocate a second instance of a singleton.");\_shared##className = [super alloc]; \return _shared##className; \} \\return nil; \ }\#endif

例子：

@interface myClass : NSObjectSingletonDeclare(myClass);-(void) doSomething;@end@implementation myClassSingletionImplement(myClass);-(void) doSomething {NSLog(@"Are you sure you're a programing monkey?"); }@end

調用
[[myClass singleton] doSomething];

轉載于:https://www.cnblogs.com/iapp/archive/2012/05/04/3631804.html

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