runtime的应用（1）

前面对runtime有了一个简单了解，可看了半天在应用在没什么用啊，那你就错了

啊，我想起来了，你前面不就要说应用吗，为毛等到现在，我还傻傻看完前一页，流量啊，其实我是来替网通做任务的

还记得归档解档吗，想想就心碎的不行啊，那一大堆的=啊，有了runtime马上心就热乎了

首先遵循NSCoding协议

//归档- (void)encodeWithCoder:(NSCoder *)aCoder{	unsigned int count;	//获得指向当前类的所有属性的指针	objc_property_t *propertys = class_copyPropertyList([Student class], &count);	for (int i = 0;  i < count; i++) {		//获得指向属性的指针		objc_property_t property = propertys[i];				const char *name = property_getName(property);				NSString *properyName = [NSString stringWithUTF8String:name];						//通过名称取值		NSString *propertyValue = [self valueForKey:properyName];		//编码属性		[aCoder encodeObject:propertyValue forKey:properyName];	}	free(propertys);}//解档- (instancetype)initWithCoder:(NSCoder *)aDecoder{		unsigned int count;	//获得指向当前类的所有属性的指针	objc_property_t *propertys = class_copyPropertyList([Student class], &count);	for (int i = 0;  i < count; i++) {		//获得指向属性的指针		objc_property_t property = propertys[i];				const char *name = property_getName(property);				NSString *properyName = [NSString stringWithUTF8String:name];				//解码属性值		NSString *propertyValue = [aDecoder decodeObjectForKey:properyName];				[self setValue:propertyValue forKey:properyName];	}   free(propertys);		return self;}