ios对象转换为字典

 /**
 *  对象转换为字典
 *
 *  @param obj 需要转化的对象
 *
 *  @return 转换后的字典
 */
+ (NSDictionary*)getObjectData:(id)obj {

    NSMutableDictionary *dic = [NSMutableDictionary dictionary];
    unsigned int propsCount;

    objc_property_t *props = class_copyPropertyList([obj class], &propsCount);

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

        objc_property_t prop = props[i];
        NSString *propName = [NSString stringWithUTF8String:property_getName(prop)];
        id value = [obj valueForKey:propName];
        if(value == nil) {

            value = [NSNull null];
        } else {
            value = [self getObjectInternal:value];
        }
        [dic setObject:value forKey:propName];
    }

    return dic;
}

+ (id)getObjectInternal:(id)obj {

    if([obj isKindOfClass:[NSString class]]
       ||
       [obj isKindOfClass:[NSNumber class]]
       ||
       [obj isKindOfClass:[NSNull class]]) {

        return obj;

    }
    if([obj isKindOfClass:[NSArray class]]) {

        NSArray *objarr = obj;
        NSMutableArray *arr = [NSMutableArray arrayWithCapacity:objarr.count];

        for(int i = 0; i < objarr.count; i++) {

            [arr setObject:[self getObjectInternal:[objarr objectAtIndex:i]] atIndexedSubscript:i];
        }
        return arr;
    }
    if([obj isKindOfClass:[NSDictionary class]]) {

        NSDictionary *objdic = obj;
        NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithCapacity:[objdic count]];

        for(NSString *key in objdic.allKeys) {

            [dic setObject:[self getObjectInternal:[objdic objectForKey:key]] forKey:key];
        }
        return dic;
    }
    return [self getObjectData:obj];

}
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