ios - '+[NSDictionary dictionaryWithObjectsAndKeys :]: second object of each pair must be non-nil. 或者，你是否忘记了 nil-terminate 你的参数列表？'

Question

我将我的代码发布到 json 但我的应用程序错误

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

-(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

您还没有为 FoodId 指定任何键。您的 NSDictionary 语法错误。应该是这样的，

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];

或

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