IOS第二天多线程-04简化单例模式
******HMSingleton-ARC.h
// .h文件 #define HMSingletonH(name) + (instancetype)shared##name; // .m文件 #define HMSingletonM(name) \ static id _instance; \ \ + (id)allocWithZone:(struct _NSZone *)zone \ { \ static dispatch_once_t onceToken; \ dispatch_once(&onceToken, ^{ \ _instance = [super allocWithZone:zone]; \ }); \ return _instance; \ } \ \ + (instancetype)shared##name \ { \ static dispatch_once_t onceToken; \ dispatch_once(&onceToken, ^{ \ _instance = [[self alloc] init]; \ }); \ return _instance; \ } \ \ - (id)copyWithZone:(NSZone *)zone \ { \ return _instance; \ }
****.m的文件中
@implementation HMMovieTool HMSingletonM(MovieTool) @end
没有失败, 只有放弃...