ios 单利的完整使用实例 及销毁 宏定义
如下所示:
//下面这段宏考过去直接用 #defineSYNTHESIZE_SINGLETON_FOR_HEADER(className)\ \ +(className*)sharedInstance;\ +(void)destroyInstance; //在单例生成之前onceToken=0,在单例生成之后onceToken=-1了,之后一直保持-1这个值,知道这个之后我想你应该有思路了 #defineSYNTHESIZE_SINGLETON_FOR_CLASS(className)\ \ staticclassName*shared##className=nil;\ staticdispatch_once_tonceToken;\ +(className*)sharedInstance\ {\ return[[selfalloc]init];\ }\ +(className*)allocWithZone:(struct_NSZone*)zone\ {\ dispatch_once(&onceToken,^{\ shared##className=[superallocWithZone:zone];\ });\ returnshared##className;\ }\ -(className*)copyWithZone:(NSZone*)zone\ {\ returnshared##className;\ }\ -(className*)mutableCopyWithZone:(NSZone*)zone\ {\ returnshared##className;\ }\ +(void)destroyInstance{\ shared##className=nil;\ onceToken=0;\ }\
//用法,注意要遵循NSCopying,NSMutableCopying协议 import@interfaceYNHTUserModel:NSObject SYNTHESIZE_SINGLETON_FOR_HEADER(YNHTUserModel); @property(nonatomic,copy)NSString*inviter_id;//邀请人ID @property(nonatomic,copy)NSString*token; @property(nonatomic,copy)NSString*nick_name; @end
#import"YNHTUserModel.h" @implementationYNHTUserModel SYNTHESIZE_SINGLETON_FOR_CLASS(YNHTUserModel); @end
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