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  • 简化单例模式

    HMSingleton.h(这个可以直接copy过去,拿到项目中去用)文件名
    
    文件内容:
    // .h文件 #define HMSingletonH(name) + (instancetype)shared##name; // .m文件 #if __has_feature(objc_arc) #define HMSingletonM(name) static id _instace; + (id)allocWithZone:(struct _NSZone *)zone { static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ _instace = [super allocWithZone:zone]; }); return _instace; } + (instancetype)shared##name { static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ _instace = [[self alloc] init]; }); return _instace; } - (id)copyWithZone:(NSZone *)zone { return _instace; } #else #define HMSingletonM(name) static id _instace; + (id)allocWithZone:(struct _NSZone *)zone { static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ _instace = [super allocWithZone:zone]; }); return _instace; } + (instancetype)shared##name { static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ _instace = [[self alloc] init]; }); return _instace; } - (id)copyWithZone:(NSZone *)zone { return _instace; } - (oneway void)release { } - (id)retain { return self; } - (NSUInteger)retainCount { return 1;} - (id)autorelease { return self;} #endif
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  • 原文地址:https://www.cnblogs.com/521it/p/4982155.html
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