版权所有，禁止匿名转载；禁止商业使用。
import "ZCPerson.h" @interface ZCPerson() @end @implementation ZCPerson static XMGPerson *_person;
(instancetype)allocWithZone:(struct _NSZone *)zone
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
_person = [super allocWithZone:zone];
});
return _person;
}
(instancetype)sharedPerson
{
static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{
_person = [[self alloc] init];
});
return _person;
}
(id)copyWithZone:(NSZone *)zone
{
return _person;
}
@end