简易Demo, 示例只包含一些基本属性用于展示实现, 并不包含嵌套关系:
#import "Person.h"
#import "objc/runtime.h"
@implementation Person
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
self = [super init];
if (self) {
// 获取所有的实例变量
unsigned int count = 0;
Ivar *ivars = class_copyIvarList([Person class], &count);
// 遍历
for (int i = 0; i < count; i ++) {
Ivar ivar = ivars[i];
const char *name = ivar_getName(ivar);
NSString *key = [NSString stringWithUTF8String:name];
// kvc
id value = [aDecoder decodeObjectForKey:key];
// 解码
[self setValue:value forKey:key];
}
free(ivars);
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)aCoder {
// 获取所有的实例变量
unsigned int count = 0;
Ivar *ivars = class_copyIvarList([Person class], &count);
// 遍历
for (int i = 0; i < count; i ++) {
Ivar ivar = ivars[i];
const char *name = ivar_getName(ivar);
NSString *key = [NSString stringWithUTF8String:name];
// kvc
/***
valueForKey (总体规则 先找相关方法 再找相关变量)
1. 先找相关方法, 如果相关方法找不到(getName name)
2. 根据accessInstanceVariablesDirectly类方法来判断
3. 如果判断是NO,直接执行KVC的valueForUndefineKey(系统跑出一个异常,未定义key)
4. 如果是YES,继续找相关变量(_name _isName,naame,isName)
***/
id value = [self valueForKey:key];
// 编码
[aCoder encodeObject:value forKey:key];
}
free(ivars);
}
@end
