尝试将NSDictionary从swift类传递到Objective c类时，无法识别的选择器被发送到实例

Question

我在swift中有一个类，它使字符串使用键中的字符串和值中的对象。例如let dict = ["key":value.key]。值始终是一个字符串。

当我在我的目标c类中获取数据时，对象类型是

_TtGCs26_SwiftDeferredNSDictionaryVs11AnyHashableP__$

并且代码期待nsdictionary。

现在当代码 -

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:dictionaryFromSwiftClass];

执行后，程序抛出错误

********[1235:641121] -[__SwiftValue encodeWithCoder:]: unrecognized selector sent to instance 0x280571380

//making dict in swift class

let dictForAddToCart:NSDictionary = 
[
    "assoc_prod":[

        ["assoc_prodID":"92",
         "assoc_prodValue":currentSelectedColor,
         "productInfo":[
             "code":productInfoColor.value(forKey: "code"),
             "id":productInfoColor.value(forKey: "id"),
             "image":productInfoColor.value(forKey: "image"),
             "label":productInfoColor.value(forKey: "label"),
             "optionslabel":productInfoColor.value(forKey: "optionslabel"),
             "price":productInfoColor.value(forKey: "price"),
             "qty":productInfoColor.value(forKey: "qty")]],

         ["assoc_prodID":"92",
         "assoc_prodValue":currentSelectedColor,
         "productInfo":[
             "code":productInfoColor.value(forKey: "code"),
             "id":productInfoColor.value(forKey: "id"),
             "image":productInfoColor.value(forKey: "image"),
             "label":productInfoColor.value(forKey: "label"),
             "optionslabel":productInfoColor.value(forKey: "optionslabel"),
             "price":productInfoColor.value(forKey: "price"),
             "qty":productInfoColor.value(forKey: "qty")]]
                  ]

     "productData":productData,
     "qty":currentSelectedQuantity

] as NSDictionary

//saving object in objective c class


- (void)saveCartArray:(NSArray *)arrayToSave {

    NSMutableArray *archiveArray = [NSMutableArray arrayWithCapacity:arrayToSave.count];

    for (NSMutableDictionary* productDic in arrayToSave) {
        NSData *productDicData = [NSKeyedArchiver archivedDataWithRootObject:productDic];

        [archiveArray addObject:productDicData];
    }

    NSUserDefaults *userData = [NSUserDefaults standardUserDefaults];
    [userData setObject:archiveArray forKey:@"cart"];

}

//NSLOG of arrayToSave-

{
        "assoc_prod" =         (
                        {
                "assoc_prodID" = 92;
                "assoc_prodValue" = 396;
                code = "********.Code.color";
                id = 92;
                image = "********.Image.empty";
                label = "********.Label.color";
                optionslabel = Nude;
                price = "280.0000";
                qty = "0.0000";
            },
                        {
                "assoc_prodID" = 180;
                "assoc_prodValue" = 388;
                code = "********.Code.size";
                id = 180;
                image = "********.Image.empty";
                label = "********.Label.size";
                optionslabel = 36;
                price = "280.0000";
                qty = "0.0000";
            }
        );
        productData =         {
            additionalParameters =             (
            );
            associatedProd = "someData";
            brand = "";
            categoryId = 378;
            description = "";
            image = "http://www.x.com/xyz.jpg";
            link = "";
            linkDownloads = "";
            name = some;
            position = 0;
            price = 280;
            productId = 1421;
            qty = 0;
            set = 0;
            shortDescription = "";
            sku = some;
            type = some;
            wsp = "";
        };
        qty = 1;
    }
)

Answer 1

我有预感这是我在这里回答的类似问题：https://stackoverflow.com/a/53501401/5329717

由于这个原因，你的情况会略有不同：

- (void)saveCartArray:(NSArray *)arrayToSave {

    NSMutableArray *archiveArray = [NSMutableArray arrayWithCapacity:arrayToSave.count];

    for (NSMutableDictionary* productDic in arrayToSave) {
        NSData *productDicData = [NSKeyedArchiver archivedDataWithRootObject:productDic];

        [archiveArray addObject:productDicData];
    }

所以基本上如果我理解正确，Swift桥接的SwiftDeferredNSDictionary是NSArray*中的元素。如果你能提取

NSData *productDicData = [NSKeyedArchiver archivedDataWithRootObject:productDic];

一个单独的方法，如：

-(void)dictionaryToData:(NSDictionary*)dic {
    return [NSKeyedArchiver archivedDataWithRootObject:productDic];
}

并使用我的链接答案解决方法：

func mySwiftFunc(dic: Dictionary) {
     myObjcClassInstance.perform(#selector(NSSelectorFromString("dictionaryToData:"), with: dic as NSDictionary)
}

你可以确保你处理“真正的”NSDictionary并避免隐含的__SwiftValue桥接。