动态归档

自定义归档,可以实现对象内包含对象等的动态判断,方便使用

#import <objc/runtime.h>
@implementation NSObject (AutoEncoding)

-(instancetype)initWithCoder:(NSCoder *)aDecoder{
 //记录类中实例变量个数

 unsigned int ivarCount = 0;

Ivar *vars = class_copyIvarList(object_getClass(self), &ivarCount);

    if (self = [self init]) {

        for (int i = 0; i < ivarCount; i ++) {

            Ivar var = vars[i];
//                NSString *type = [NSString stringWithUTF8String:ivar_getTypeEncoding(var)];
            NSString *name = [NSString stringWithUTF8String:ivar_getName(var)];
            [self setValue:[aDecoder decodeObjectForKey:name] forKey:name];
        }

    }

free(vars);
return self;
}

-(void)encodeWithCoder:(NSCoder *)aCoder{
//    记录中 实例变量的个数
unsigned int ivarCount = 0;
Ivar * vars = class_copyIvarList(object_getClass(self), &ivarCount);
for (int i = 0; i < ivarCount; i ++) {
    Ivar var = vars[i];
//        NSString *type = [NSString stringWithUTF8String:ivar_getTypeEncoding(var)];
    NSString *name = [NSString stringWithUTF8String:ivar_getName(var)];
    id value = [self valueForKey:name];
    [aCoder encodeObject:value forKey:name];
}

free(vars);

}