问题：在Dog.m里面实现归档，解归档
已知有个C语言写的demoFunc，能拿到key,也可以转换成ocKey，现在怎么做归档和解归档？
新建Dog类，在头文件里面定义几个变量，和一个方法
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我们在Dog.m里面实现
#import "Dog.h"
#import <objc/objc-runtime.h>
@interface Dog ()<NSCoding>
{
NSInteger xxx;
}
@end
@implementation Dog
#if 1
- (instancetype)initWithCoder:(NSCoder *)aDecoder{
self = [super init];
if (self) {
unsigned int count = 0;
//Ivar代表C语言的数组
Ivar *ivars = class_copyIvarList([self class], &count);
for (int i = 0; i<count; i++) {
Ivar ivar = ivars[i];
const char *key = ivar_getName(ivar);
//把C语言写的东西转换成UTF-8编码;
NSString *ocKey = [NSString stringWithCString:key encoding:NSUTF8StringEncoding];
//id定义value为任意OC对象.把ocKey对应的value赋值给它.
id value = [aDecoder decodeObjectForKey:ocKey];
//用KVC去存数据;
[self setValue:value forKey:ocKey];
}
}
return nil;
}
- (void)encodeWithCoder:(NSCoder *)aCoder{
unsigned int count = 0;
//Ivar代表C语言的数组
Ivar *ivars = class_copyIvarList([self class], &count);
// for循环遍历
for (int i = 0; i<count; i++) {
Ivar ivar = ivars[i];
//拿到值，赋值给key
const char *key = ivar_getName(ivar);
//转成oc可以读的Key
NSString *ocKey = [NSString stringWithCString:key encoding:NSUTF8StringEncoding];
//value等于ocKey对应的value
id value = [self valueForKey:ocKey];
//用KVC去取数据
[aCoder encodeObject:value forKey:ocKey];
NSLog(@"%@:%@",ocKey,value);
}
// class_copyPropertyList(<#__unsafe_unretained Class cls#>, <#unsigned int *outCount#>)
}
#endif
//demoFunc为之前给的示例代码
- (void)demoFunc{
unsigned int count = 0;
Ivar *ivars = class_copyIvarList([self class], &count);
for (int i = 0; i<count; i++) {
Ivar ivar = ivars[i];
const char *key = ivar_getName(ivar);
NSString *ocKey = [NSString stringWithCString:key encoding:NSUTF8StringEncoding];
id value = [self valueForKey:ocKey];
NSLog(@"%@:%@",ocKey,value);
}
}
@end
写法二:
也可以将老师的方法封装成block, 写法如下:
#if 1
- (instancetype)initWithCoder:(NSCoder *)aDecoder{
self = [super init];
if (self) {
[self demoBlock:^(NSString *zzz) {
id value = [aDecoder decodeObjectForKey:zzz];
[self setValue:value forKey:zzz];
}];
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)aCoder{
[self demoBlock:^(NSString *zzz) {
id value = [self valueForKey:zzz];
[aCoder encodeObject:value forKey:zzz];
}];
}
-(void)demoBlock:(void(^)(NSString*zzz))blc {
//直接复制之前C语言编写的可以重用的代码
unsigned int count = 0;
Ivar *ivars = class_copyIvarList([self class], &count);
for (int i = 0; i<count; i++) {
Ivar ivar = ivars[i];
const char *key = ivar_getName(ivar);
NSString *ocKey = [NSString stringWithCString:key encoding:NSUTF8StringEncoding];
blc(ocKey);
}
}
#endif
