首先新建一个头文件,定义如下宏:
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// .h文件的实现#define SingletonH(methodName) + (instancetype)shared##methodName;// .m文件的实现#if __has_feature(objc_arc) // 是ARC#define SingletonM(methodName) static id _instace = nil; + (id)allocWithZone:(struct _NSZone *)zone { if (_instace == nil) { static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ _instace = [super allocWithZone:zone]; }); } return _instace; } - (id)init { static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ _instace = [super init]; }); return _instace; } + (instancetype)shared##methodName { return [[self alloc] init]; } + (id)copyWithZone:(struct _NSZone *)zone { return _instace; } + (id)mutableCopyWithZone:(struct _NSZone *)zone { return _instace; }#else // 不是ARC#define SingletonM(methodName) static id _instace = nil; + (id)allocWithZone:(struct _NSZone *)zone { if (_instace == nil) { static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ _instace = [super allocWithZone:zone]; }); } return _instace; } - (id)init { static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ _instace = [super init]; }); return _instace; } + (instancetype)shared##methodName { return [[self alloc] init]; } - (oneway void)release { } - (id)retain { return self; } - (NSUInteger)retainCount { return 1; } + (id)copyWithZone:(struct _NSZone *)zone { return _instace; } + (id)mutableCopyWithZone:(struct _NSZone *)zone { return _instace; }#endif |
然后在你定义单例类的
.h 文件 写 SingletonH(MyMethodName)
.m 文件写 SingletonM(MyMethodName)
搞定!