每对的第二个对象必须是非零的。或者，你忘记了 nil-terminate 你的参数列表吗？添加行数时

Question

我遇到异常：

'NSInvalidArgumentException', reason: '+[NSDictionary dictionaryWithObjectsAndKeys:]: second object of each pair must be non-nil. Or, did you forget to nil-terminate your parameter list?'

在此代码中：

if ([[questionaireDic objectForKey:@"Answer6Option"] boolValue]) {
    NSArray *ans6Arr = [subQuestionaireArr filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"QuestionNo = 6 AND SortOrder = 1"]];
    int rowCount = 1;
    for (int i =0;i<ans6Arr.count ; i++) {
        NSDictionary *ans6Dic = ans6Arr[ i];
        NSDictionary *answer6Row1Cell1TextDic = [NSDictionary dictionaryWithObjectsAndKeys:@"810-L50-%d",rowCount,@"DataId",[ans6Dic objectForKey:@"Cell1Text"],@"Value", nil];
        [questionaireArr addObject:answer6Row1Cell1TextDic];

        NSDictionary *answer6Row1Cell2DateDic = [NSDictionary dictionaryWithObjectsAndKeys:@"820-L50-%d",rowCount,@"DataId",[ans6Dic objectForKey:@"Cell2Date"],@"Value", nil];
        [questionaireArr addObject:answer6Row1Cell2DateDic];

        NSDictionary *answer6Row1Cell3NumberDic = [NSDictionary dictionaryWithObjectsAndKeys:@"830-L50-%d",rowCount,@"DataId",[ans6Dic objectForKey:@"Cell3Number"],@"Value", nil];
        [questionaireArr addObject:answer6Row1Cell3NumberDic];

        if (![[ans6Dic objectForKey:@"Cell4Number"] isKindOfClass:[NSNull class]]) {
            NSDictionary *answer6Row1Cell4NumberDic = [NSDictionary dictionaryWithObjectsAndKeys:@"840-L50-%d",rowCount,@"DataId",[ans6Dic objectForKey:@"Cell4Number"],@"Value", nil];
            [questionaireArr addObject:answer6Row1Cell4NumberDic];
        }
        rowCount++;
    }

我已经尝试了 Second object of each pair must be non-nil and Second object of each pair must be non-nil 中的修复程序。其中有几个 examples.But none 帮助了

Answer 1

我发现重新格式化代码以提高易读性有时会有所帮助...

如果您更改此行：

NSDictionary *answer6Row1Cell1TextDic = [NSDictionary dictionaryWithObjectsAndKeys:@"810-L50-%d",rowCount,@"DataId",[ans6Dic objectForKey:@"Cell1Text"],@"Value", nil];

至：

NSDictionary *answer6Row1Cell1TextDic =
[NSDictionary dictionaryWithObjectsAndKeys:
 @"810-L50-%d", rowCount,
 @"DataId", [ans6Dic objectForKey:@"Cell1Text"],
 @"Value", nil
 ];

您会看到您有一个对象 "Value" 的 nil 键...我敢肯定，这不是您的意图。

注意：我认为您的对象和键也颠倒了...

Answer 2

此异常是由于带有格式说明符的字符串引起的。您应该将两个 @"810-L50-%d",rowCount 值包含在一个字符串中。否则，它将 @"810-L50-%d" 作为键 rowCount.

的对象值

因此，键和值应更改为

NSDictionary *answer6Row1Cell1TextDic = [NSDictionary dictionaryWithObjectsAndKeys:[NSString stringWithFormat:@"810-L50-%d",rowCount], @"DataId",[ans6Dic objectForKey:@"Cell1Text"],@"Value", nil];

Answer 3

您似乎在尝试从格式 @810-L50-%d 和值 rowCount 生成字符串 * 而实际上并未调用字符串格式化方法来执行此操作。因此，您的值和键列表不同步，编译器报告与 nil.

有关的错误

切换到现代语法并更正此问题：

NSDictionary *answer6Row1Cell1TextDic =
   @{ @"DataId" : [NSString stringWithFormat:@"810-L50-%d",rowCount],
      @"Value" : ans6Dic[@"Cell1Text"]
    };

@{ ... } 语法是一个 字典文字 并且包含零个或多个 <key> : <value> 对。 ans6Dic[@"Cell1Text"] 是 字典索引，它查找与键匹配的值。

HTH

每对的第二个对象必须是非零的。或者，你忘记了 nil-terminate 你的参数列表吗？添加行数时

second object of each pair must be non-nil. Or, did you forget to nil-terminate your parameter list?' when adding row count

objective-c

nsdictionary