Objective c 所有相同密钥的总和

我不熟悉iOS

我有一个NSdictionary的NSMutableArray

我想做所有相同键的和， 这是我的代码，我试过了，但没有成功

ARQprofileDataArray此为NSMutableArray：

我想求康纳廷MF所有类别的和，以及康纳廷股权所有类别的和

我的代码：

 NSNumber *sum = [ARQProfileDataArray valueForKeyPath:@"@sum.category"];
  NSLog(@"sum---------- %@",sum);

我的代码在此行上崩溃NSNumber*sum=[ARQProfileDataArray valueForKeyPath:@@sum.category]

请帮忙，我哪里出错了？

---

提前谢谢

使循环成为您的NSMutableArray。请检查Objective-C的语法很长时间了&我没有检查

//Declare variable for category types

int mfCount = 0
int equityCount = 0

for dict in ARQProfileDataArray {
  if ([dict[@"category"] isEqualToString:@"MF"]) {
       mfCount += 1;
  } else if ([dict[@"category"] isEqualToString:@"Equity"]) {
       equityCount += 1;
 }
}

现在您有了mfCount和equityCount中的类别之和

---

如果您不想为每个键创建变量，那么您可以改为创建字典并在case中更新它。

请找到一个简单而通用的解决方案

    NSMutableArray *sumArray = [@[@{
        @"type":@"arqEquity",
        @"category":@"Equity",
        @"investment":@6935.7,
        @"percentage":@"25.43"
    },
    @{
        @"type":@"liquid",
        @"category":@"MF",
        @"investment":@0,
        @"percentage":@0
    },
    @{
        @"type":@"balanced",
        @"category":@"MF",
        @"investment":@10215.87,
        @"percentage":@"37.46"
    },
    @{
        @"type":@"equityMF",
        @"category":@"MF",
        @"investment":@10123.41,
        @"percentage":@"37.12"
        }] mutableCopy];

    // It will work for Number and Integer.
    NSNumber *sum = [sumArray valueForKeyPath:@"@sum.investment"];
    NSLog(@"Sum of Investment : %@", sum);

    NSArray *categorys = [sumArray valueForKeyPath:@"@distinctUnionOfObjects.category"];
    for (NSString* item in categorys)
    {

        NSArray *categoryArray = [self findSameValueKey:sumArray WithKey:@"category" WithValue:item];
        NSLog(@"%@ count: %@", item,@([categoryArray count]));
    }


    // Helps to find same value key.
    -(NSArray*)findSameValueKey:(NSArray*)dateArray WithKey:(NSString*)key WithValue:(NSString*)value{
        NSPredicate *predicate = [NSPredicate predicateWithBlock:^BOOL(NSDictionary *resultsDictionary, NSDictionary *bind){
            if ([resultsDictionary objectForKey: key] && [[resultsDictionary objectForKey: key] isEqualToString:value]) {
                return true;
            }
            return false;
        }];

        // Apply the predicate block .
        NSArray *sameValueKeys = [dateArray filteredArrayUsingPredicate:predicate];
        return sameValueKeys;
    }

---

谢谢你的帮助，我尝试了你的代码，但它在这一行崩溃了NSNumber*sum=[sumArray valueForKeyPath:@@sum.investment]；请提供有效的答复。查看您的响应，它同时具有字符串和整数数据类型。投资额：6935.7，投资额：0，。你能试试我的密码吗？你会明白的。Thanx为了帮助我尝试了你的代码，我不想计算，我想添加值glad来帮助你。你可以随时修改它。这里的语法不正确`Switch dict[@category]`

    NSMutableArray *sumArray = [@[@{
        @"type":@"arqEquity",
        @"category":@"Equity",
        @"investment":@6935.7,
        @"percentage":@"25.43"
    },
    @{
        @"type":@"liquid",
        @"category":@"MF",
        @"investment":@0,
        @"percentage":@0
    },
    @{
        @"type":@"balanced",
        @"category":@"MF",
        @"investment":@10215.87,
        @"percentage":@"37.46"
    },
    @{
        @"type":@"equityMF",
        @"category":@"MF",
        @"investment":@10123.41,
        @"percentage":@"37.12"
        }] mutableCopy];

    // It will work for Number and Integer.
    NSNumber *sum = [sumArray valueForKeyPath:@"@sum.investment"];
    NSLog(@"Sum of Investment : %@", sum);

    NSArray *categorys = [sumArray valueForKeyPath:@"@distinctUnionOfObjects.category"];
    for (NSString* item in categorys)
    {

        NSArray *categoryArray = [self findSameValueKey:sumArray WithKey:@"category" WithValue:item];
        NSLog(@"%@ count: %@", item,@([categoryArray count]));
    }


    // Helps to find same value key.
    -(NSArray*)findSameValueKey:(NSArray*)dateArray WithKey:(NSString*)key WithValue:(NSString*)value{
        NSPredicate *predicate = [NSPredicate predicateWithBlock:^BOOL(NSDictionary *resultsDictionary, NSDictionary *bind){
            if ([resultsDictionary objectForKey: key] && [[resultsDictionary objectForKey: key] isEqualToString:value]) {
                return true;
            }
            return false;
        }];

        // Apply the predicate block .
        NSArray *sameValueKeys = [dateArray filteredArrayUsingPredicate:predicate];
        return sameValueKeys;
    }