根据字典数组为 tableview 设置 numberOfRowsInSection答案

【问题标题】：Set numberOfRowsInSection for tableview as per the Array of Dictionaries根据字典数组为 tableview 设置 numberOfRowsInSection
【发布时间】：2018-07-04 14:30:19
【问题描述】：

我有一个小问题...

这里有一个名为 arrayDishDetails 的数组

{
    "dishid": "5",
    "cusineid": "1",
    "dishname": "Cheese Fries",
    "dishimage": "noimage.png",
    "type": "NA",
    "description": "VEG FRIES",
    "price": "120",
    "swiggy_status": "enable",
    "preflag": "true",
    "pre": [
        {
            "preid": "112",
            "pretype": "Multi",
            "prenm": "BATTER FRIED FISH",
            "preprice": "70",
            "cat_id": "3"
        },
        {
            "preid": "109",
            "pretype": "Multi",
            "prenm": "JALAPENO POPPERS",
            "preprice": "50",
            "cat_id": "3"
        },
        {
            "preid": "110",
            "pretype": "Multi",
            "prenm": "CHICKEN SAUSAGES",
            "preprice": "50",
            "cat_id": "3"
        },
        {
            "preid": "111",
            "pretype": "Multi",
            "prenm": "CHICKEN NUGGETS",
            "preprice": "50",
            "cat_id": "3"
        },
        {
            "preid": "113",
            "pretype": "Multi",
            "prenm": "SHREDDED CHICKEN",
            "preprice": "50",
            "cat_id": "3"
        },
        {
            "preid": "114",
            "pretype": "Multi",
            "prenm": "CHICKEN POPCORN",
            "preprice": "50",
            "cat_id": "3"
        },
        {
            "preid": "105",
            "pretype": "Multi",
            "prenm": "GRATED CHEESE",
            "preprice": "30",
            "cat_id": "3"
        },
        {
            "preid": "272",
            "pretype": "Multi",
            "prenm": "Chili",
            "preprice": "20",
            "cat_id": "6"
        },
        {
            "preid": "273",
            "pretype": "Multi",
            "prenm": "Jalapeno Cheese",
            "preprice": "20",
            "cat_id": "6"
        },
        {
            "preid": "274",
            "pretype": "Multi",
            "prenm": "Salsa",
            "preprice": "20",
            "cat_id": "6"
        },
        {
            "preid": "275",
            "pretype": "Multi",
            "prenm": "BBQ",
            "preprice": "20",
            "cat_id": "6"
        },
        {
            "preid": "276",
            "pretype": "Multi",
            "prenm": "Mayo",
            "preprice": "20",
            "cat_id": "6"
        },
        {
            "preid": "277",
            "pretype": "Multi",
            "prenm": "Schezwan",
            "preprice": "20",
            "cat_id": "6"
        },
        {
            "preid": "278",
            "pretype": "Multi",
            "prenm": "Pizza Sauce",
            "preprice": "20",
            "cat_id": "6"
        },
        {
            "preid": "279",
            "pretype": "Multi",
            "prenm": "Chipotle",
            "preprice": "20",
            "cat_id": "6"
        },
        {
            "preid": "280",
            "pretype": "Multi",
            "prenm": "Tandoori",
            "preprice": "20",
            "cat_id": "6"
        },
        {
            "preid": "281",
            "pretype": "Multi",
            "prenm": "Garlic Mayo",
            "preprice": "20",
            "cat_id": "6"
        },
        {
            "preid": "282",
            "pretype": "Multi",
            "prenm": "Tartare sauce",
            "preprice": "20",
            "cat_id": "6"
        },
        {
            "preid": "283",
            "pretype": "Multi",
            "prenm": "Thai Sweet Chili",
            "preprice": "20",
            "cat_id": "6"
        },
        {
            "preid": "284",
            "pretype": "Multi",
            "prenm": "Makhani Gravy",
            "preprice": "20",
            "cat_id": "6"
        },
        {
            "preid": "106",
            "pretype": "Multi",
            "prenm": "CRUSHED TORTILLAS",
            "preprice": "20",
            "cat_id": "3"
        },
        {
            "preid": "107",
            "pretype": "Multi",
            "prenm": "BEANS",
            "preprice": "20",
            "cat_id": "3"
        },
        {
            "preid": "115",
            "pretype": "Multi",
            "prenm": "FRIED MAGGI",
            "preprice": "20",
            "cat_id": "3"
        },
        {
            "preid": "270",
            "pretype": "Multi",
            "prenm": "Chat Masala",
            "preprice": "10",
            "cat_id": "3"
        },
        {
            "preid": "108",
            "pretype": "Multi",
            "prenm": " MAGIC MASALA",
            "preprice": "10",
            "cat_id": "3"
        }
    ],
    "modifier_cat": [
        {
            "cat_id": "3",
            "cat_name": "ADD ONS",
            "modifier_selection": "1"
        },
        {
            "cat_id": "6",
            "cat_name": "Extra Sauces",
            "modifier_selection": "1"
        }
    ]
}

现在在我的表格视图中，我像这样设置 titleForHeaderInSection。

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    return [[[self.arrayDishDetails valueForKey:@"modifier_cat"] valueForKey:@"cat_name"] objectAtIndex:section];
}

我这样设置 numberOfSectionsInTableView..

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [[self.arrayDishDetails valueForKey:@"modifier_cat"] count];
}

现在，我的问题是，如何过滤 "pre" 数组以通过 "cat_id" 从 "prenm" 从 "modifier_cat" 数组，这样我就可以得到 2 个不同的类别？

例如：-

for "cat_id" = "3" 我想要所有的 "prenm" 像 "prenm": "BATTER FRIED FISH","JALAPENO POPPERS", "CHICKEN "pre" 数组中的 SAUSAGES" 等。

"cat_id" = "6"

也一样

我已经为过滤器数组寻找了许多解决方案，但无法获得我的帮助。任何帮助将非常感激。谢谢！

编辑 1：

我从@Karthik 的回答中得到了一些提示，我为我的表格视图设置了行数，如下所示：

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"cat_id = %@", [[[self.arrayDishDetails valueForKey:@"modifier_cat"]valueForKey:@"cat_id"]objectAtIndex:section]]; 
NSArray *filteredArray = [[self.arrayDishDetails valueForKey:@"pre"] filteredArrayUsingPredicate:predicate];
 
return filteredArray.count; 
}

现在，如何根据 "modifier_cat" 的 "cat_id" 为每个部分（此处为 0 和 1 两个部分）设置 "prenm" 数组？

【问题讨论】：

标签： ios objective-c nsarray nsdictionary

【解决方案1】：

我认为您正在寻找使用自定义对象过滤数组。我假设您放置的 JSON 已映射到自定义对象。添加以下代码以从 modifier_cat 数组中过滤带有 cat_id 的 pre 数组。

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [self getFilteredArray: section].count;
}

要显示包含项目的单元格，请使用以下方法

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle: UITableViewCellStyleDefault reuseIdentifier: @"FishDetailsCell"];
    UILabel *fishStyle = [[UILabel alloc] initWithFrame: CGRectMake(0, 0, tableView.frame.size.width, 100)];
    Pre *pre = [[self getFilteredArray:indexPath.section] objectAtIndex: indexPath.row];
    fishStyle.text = pre.prenm;
    fishStyle.textAlignment = NSTextAlignmentCenter;
    [cell addSubview: fishStyle];
    return cell;
}

// 过滤数组的复用方法

- (NSArray *)getFilteredArray:(NSInteger)section {
    NSPredicate *predicate = [NSPredicate predicateWithFormat: @"cat_id = %@", [[[self.arrayDishDetails valueForKey:@"modifier_cat"]valueForKey:@"cat_id"]objectAtIndex: section]];
    NSArray *filteredArray = [[self.arrayDishDetails valueForKey: @"pre"] filteredArrayUsingPredicate: predicate];
    return filteredArray;
}

希望这篇文章有所帮助。谢谢。

【讨论】：

谢谢！这对我有帮助。我得到了我的表视图的行数，如下所示： -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { NSPredicate *predicate = [NSPredicate predicateWithFormat:@"cat_id = %@", [[[self.arrayDishDetails valueForKey:@"modifier_cat"]valueForKey:@"cat_id"]objectAtIndex:section]]; NSArray *filteredArray = [[self.arrayDishDetails valueForKey:@"pre"] filteredArrayUsingPredicate:predicate];返回filteredArray.count； }
但是我如何才能在我的 tableview 中为每个部分打印“prenm”？
您希望 prenm 作为部分标题还是行标题？
每个 prenm 作为每个部分的行。与第 0 节一样，所有 prenm 的 cat_id = 3，对于第 1 节，所有 prenm 的 cat_id = 6。
如果您觉得这个答案有帮助，请您接受并支持我的回答。这将有助于提高我的 SO 评级。@iHarshil

【解决方案2】：

所以你可以通过以下方式做到这一点：

for cat in [self.arrayDishDetails valueForKey:@"modifier_cat"] {
    NSString *cat_id = [cat valueForKey:@"cat_id"];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"cat_id = %@", cat_id];
    NSArray *filteredArray = [pre filteredArrayUsingPredicate:predicate];
    //Here you will be getting your filtered array for cat_id 3 and 6 one after another, store it as per your requirement.
    NSArray *filteredprenmArrayForCatId = [filteredArray valueForKey:@"prenm"];    
}

希望这会有所帮助。

【讨论】：