ios类\u copyPropertyList返回较少的计数属性

我在函数中调用类\ uCopyPropertyList

+ (NSDictionary *)classPropsFor:(Class)klass{
    if (klass == NULL) {
        return nil;
    }

    NSMutableDictionary *results = [[NSMutableDictionary alloc] init] ;

    unsigned int outCount, i;
    objc_property_t *properties = class_copyPropertyList(klass, &outCount);
    for (i = 0; i < outCount; i++) {
        objc_property_t property = properties[i];
        const char *propName = property_getName(property);
        if(propName) {
            const char *propType = getPropertyType(property);
            NSString *propertyName = [NSString stringWithUTF8String:propName];
            NSString *propertyType = [NSString stringWithUTF8String:propType];
            if (propertyType != nil){
                [results setObject:propertyType forKey:propertyName];
            }
        }
    }
    free(properties);

    // returning a copy here to make sure the dictionary is immutable
    return [NSDictionary dictionaryWithDictionary:results];
}

但以具有2个属性的类为例，它会获得不同的属性计数列表：一次0计数，另一次2计数，另一次1计数

为什么?

---

这发生在iOS 7上

可能是因为：问题是运行时返回NSNumber