Question

我们说我的NSMutableArray如下所示。

(
        {
        blockNumber = 1;
        boxId = 1;
        boxNumber = 4536;
        carId = 10;
        carNumber = 10;
        isDeleted = yes;
    },
        {
        blockNumber = 2;
        boxId = 2;
        boxNumber = 4537;
        carId = 10;
        carNumber = 10;
        isDeleted = yes;
    },
        {
        blockNumber = 3;
        boxId = 3;
        boxNumber = 4538;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 4;
        boxId = 4;
        boxNumber = 4539;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 5;
        boxId = 5;
        boxNumber = 4540;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 6;
        boxId = 6;
        boxNumber = 4541;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 7;
        boxId = 7;
        boxNumber = 4542;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 8;
        boxId = 8;
        boxNumber = 4543;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 9;
        boxId = 9;
        boxNumber = 4544;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 10;
        boxId = 10;
        boxNumber = 4545;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 11;
        boxId = 11;
        boxNumber = 4546;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 12;
        boxId = 12;
        boxNumber = 4547;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 13;
        boxId = 13;
        boxNumber = 4548;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 14;
        boxId = 14;
        boxNumber = 4549;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 15;
        boxId = 15;
        boxNumber = 4550;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 16;
        boxId = 16;
        boxNumber = 4551;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 17;
        boxId = 17;
        boxNumber = 4552;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 18;
        boxId = 18;
        boxNumber = 4553;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 19;
        boxId = 19;
        boxNumber = 4554;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 20;
        boxId = 20;
        boxNumber = 4555;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 21;
        boxId = 21;
        boxNumber = 4556;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 22;
        boxId = 22;
        boxNumber = 4557;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 23;
        boxId = 23;
        boxNumber = 4558;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 24;
        boxId = 24;
        boxNumber = 4559;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 25;
        boxId = 25;
        boxNumber = 4560;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 26;
        boxId = 26;
        boxNumber = 4561;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 27;
        boxId = 27;
        boxNumber = 4562;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 28;
        boxId = 28;
        boxNumber = 4563;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 29;
        boxId = 29;
        boxNumber = 4564;
        carId = 10;
        carNumber = 10;
        isDeleted = no;
    },
        {
        blockNumber = 30;
        boxId = 30;
        boxNumber = 4565;
        carId = 10;
        carNumber = 10;
        isDeleted = yes;
    }
)

我想要的是我的号码isDeleted = yes。

在我的情况下，它是3。

我知道我可以通过下面的循环来做到这一点。

for (NSMutableDictionary* aDict in carBoxesArray) {
    if ([aDict[@"isDeleted"] isEqualToString:@"yes"]) {
        findTotalYes++;
    }
}

然而，我正在寻找任何其他方式（可能是一个班轮），它会给我我想要的东西。

特别是我不想使用循环（因为我可以在数组中有更多的记录，这需要花费一些时间进行迭代）

Answer 1

您可以使用NSPredicate

NSArray *totalYes = [carBoxesArray filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(isDeleted == %@)", @"yes"]];

NSLog(@"Found Total YES: %d",totalYes.count);

Answer 2

您可以在后台线程中使用循环并在主线程中使用一些加载器。在这种情况下，当您进行循环时，显示不会冻结。

Answer 3

您也可以使用NSCountedSet：

NSCountedSet *countset = [NSCountedSet setWithArray:[carBoxesArray valueForKey:@"isDeleted"]];
NSInteger count = [countset countForObject:@"yes"];

当你要求一个班轮时，将上面的两行合并为一个：

NSInteger count = [[NSCountedSet setWithArray:[carBoxesArray valueForKey:@"isDeleted"]] countForObject:@"yes"];

Answer 4

你也可以使用枚举，

如下所示

__block int count = 0;
[carBoxesArray enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
   if([[obj objectForKey:@"isDeleted"] isEqualToString:@"yes"])
       count++;
}];

NSLog(@"%d",count);

找到＆＃34;是＆＃34;在NSMutableArray中

4 个答案: