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当我们归档自定义对象的时候，可以重写自定义Model的的encodeWithCoder和initWithCoder
开始的大概是这样的，当属性非常多的时候 这种方式就会觉得不还好 好像重复在做一样的事情 其实这块我们可以交给runtime来做
- (void)encodeWithCoder:(NSCoder *)aCoder //将属性进行编码
{
[aCoder encodeObject:self.name forKey:@"name"];
[aCoder encodeObject:self.phone forKey:@"phone"];
[aCoder encodeInteger:self.age forKey:@"age"];
}
- (id)initWithCoder:(NSCoder *)aDecoder //将属性进行解码
{
NSString *name1 = [aDecoder decodeObjectForKey:@"name"];
NSString *phone1 = [aDecoder decodeObjectForKey:@"phone"];
int age1 = [aDecoder decodeIntegerForKey:@"age"];
[self initWithName:name1 phone:phone1 age:age1];
return self;
}
用runtime来实现上面的功能
-(void)encodeWithCoder:(NSCoder *)encoder{
unsigned int count;
Ivar *ivar = class_copyIvarList([User class], &count);
for (int i=0; i<count; i++) {
Ivar iv = ivar[i];
const char *name = ivar_getName(iv);
NSString *strName = [NSString stringWithUTF8String:name];
//利用KVC取值
id value = [self valueForKey:strName];
[encoder encodeObject:value forKey:strName];
}
free(ivar);
}
-(id)initWithCoder:(NSCoder *)decoder{
self = [super init];
if (self) {
unsigned int count = 0;
//获取类中所有成员变量名
Ivar *ivar = class_copyIvarList([User class], &count);
for (int i = 0; i<count; i++) {
Ivar iva = ivar[i];
const char *name = ivar_getName(iva);
NSString *strName = [NSString stringWithUTF8String:name];
//进行解档取值
id value = [decoder decodeObjectForKey:strName];
//利用KVC对属性赋值
[self setValue:value forKey:strName];
}
free(ivar);
}
return self;
}
用runtime来重写Coder和deCode方法 归档解档的时候使用
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原文地址：http://www.cnblogs.com/damiao/p/5358538.html
