Question

我将mycode发布到json但我的应用程序错误

“因未捕获的异常而终止应用 'NSInvalidArgumentException'，原因：'+ [NSDictionary dictionaryWithObjectsAndKeys：]：每对的第二个对象必须是非空。或者，您是否忘记了终止参数列表？'“

-(void)requesdatesendorder:(NSArray *)foodid{
NSString *FoodId ;

for (int i =0; i < foodid.count; i++) {
    NSString *idfood = [foodid objectAtIndex:i];
    if (FoodId.length == 0) {
        FoodId = [NSString stringWithFormat:@"%@,food_id[%d]",idfood,i];
    }
    else{
        FoodId = [NSString stringWithFormat:@"%@,%@,food_id[%d]",FoodId,idfood,i];
    }
}

NSLog(@"%@",FoodId);

NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
                        @"date_send_order",@"params",
                        FoodId
                        ,nil];
[self requestWithMethod:@"POST"
              urlString:kFeedBeeservice
             parameters:params
                   mode:Beeservicedatesendorder];
}

但我想发送json格式 http://i.stack.imgur.com/tkfqv.png

Answer 1

您尚未为 FoodId 指定任何键。您的NSDictionary语法错误。它应该如下，

NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
                    @"Object1",@"key1",@"object2",@"key2",nil];

在您的代码中为FoodId添加一个键或为FoodId添加一个对象。它将解决您的错误。

NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
                    @"date_send_order",@"params",
                    FoodId,@"key",nil];

OR

NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
                    @"date_send_order",@"params",@"object"
                    FoodId,nil];

Answer 2

我看到有三个问题：

一旦你有了字符串，就打破for循环：

NSString *foodIdStr = nil;

for (int i =0; i < foodid.count && foodIdStr == nil; i++) {
    NSString *idfood = [foodid objectAtIndex:i];
    if (FoodId.length == 0) {
        foodIdStr = [NSString stringWithFormat:@"%@,food_id[%d]",idfood,i];
    }
    else{
        foodIdStr = [NSString stringWithFormat:@"%@,%@,food_id[%d]",FoodId,idfood,i];
    }
}

确保您没有为字典分配nil值：

if (foodIdStr == nil) {
    NSLog(@"Failed to get food id");
    return;
}

您使用了错误数量的参数dictionaryWithObjectsAndKeys：

NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
    @"date_send_order", @"params",
    foodIdStr, @"food_id",    // Here
    nil];

'+ [NSDictionary dictionaryWithObjectsAndKeys：]：每对的第二个对象必须是非零的。或者，您是否忘记了终止参数列表？

2 个答案: