单例宏定义的写法
1 // 单例的声明 2 // ## 拼接 3 // \回车 换行 4 #define singleton_interface(className) \ 5 + (instancetype)shared##className; 6 7 // 单例实现 8 #define singleton_implementation(className) \ 9 static className *manager = nil; \ 10 + (instancetype)shared##className { \ 11 static dispatch_once_t onceToken; \ 12 dispatch_once(&onceToken, ^{ \ 13 manager = [[[self class] alloc] init]; \ 14 }); \ 15 return manager; \ 16 }
