只需几句话，就可以让 NSCoding 协议自动化。
将两个文件复制到您的项目中，并添加 #import "NSObject+NSCoding.h"。目前 CocoaPods 支持。
self 是 Parent 的子类
Parent
#pragma mark - NSCoding
- (void)encodeWithCoder:(NSCoder *)encoder
{
[self encodeAutoWithCoder:encoder class:[Parent class]];
}
- (id)initWithCoder:(NSCoder *)decoder
{
if (self = [super init]) {
[self decodeAutoWithAutoCoder:decoder class:[Parent class]];
}
return self;
}
Children
#pragma mark - NSCoding
- (void)encodeWithCoder:(NSCoder *)encoder
{
[super encodeWithCoder:encoder];
[self encodeAutoWithCoder:encoder];
}
- (id)initWithCoder:(NSCoder *)decoder
{
if (self = [super initWithCoder:decoder]) {
[self decodeAutoWithAutoCoder:decoder];
}
return self;
}#pragma mark - NSCoding
- (void)encodeWithCoder:(NSCoder *)aCoder
{
[self encodeAutoWithCoder:aCoder];
}
- (id)initWithCoder:(NSCoder *)aDecoder
{
if (self = [super initWithCoder:aDecoder]) {
[self decodeAutoWithAutoCoder:aDecoder];
}
return self;
}