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社区首页 >问答首页 >如何从字典数组中获取字典数组(例如arrayGroupBy)，其中某个键的值在另一个字典键的值中匹配

问如何从字典数组中获取字典数组(例如arrayGroupBy)，其中某个键的值在另一个字典键的值中匹配
EN

Stack Overflow用户
提问于 2014-11-04 14:04:12
回答 2查看 159关注 0票数 1

我有一个NSMutable数组，其中包含这样的NSDictionaries：

代码语言：javascript
复制
<__NSArrayM 0x7a2b4b00>(
{
"appointment_id" = 235;
"component_name" = Anil;
id = 5;
"start_time" = "2014-11-04 19:00:00";
"time_slot" = "7:00 PM";
},
{
    "appointment_id" = 235;
"component_name" = "test_book";
id = 19;
"start_time" = "2014-11-04 19:00:00";
"time_slot" = "7:00 PM";
},
{
"appointment_id" = 235;
"component_name" = "New Resource";
id = 21;
"start_time" = "2014-11-04 19:00:00";
"time_slot" = "7:00 PM";
},
{
"appointment_id" = 236;
"component_name" = ctbl;
id = 8;
"start_time" = "2014-11-04 22:00:00";
"time_slot" = "10:00 PM";
},
{
"appointment_id" = 236;
"component_name" = btbl;
id = 7;
"start_time" = "2014-11-04 22:00:00";
"time_slot" = "10:00 PM";
  },
{
"appointment_id" = 236;
    "component_name" = "New Resource";
id = 21;
"start_time" = "2014-11-04 22:00:00";
"time_slot" = "10:00 PM";
}
)

如何从上面的结构中创建一个新的数组，比如arrGroupByTimeSlots，如下所示：

代码语言：javascript
复制
array of time slot
(
time_slot = (an array of dictionaries with matching time_slot)
time_slot = (an array of dictionaries with matching another time_slot)
)

详细情况：

代码语言：javascript
复制
(
time_slot = ({
"appointment_id" = 235;
"component_name" = Anil;
id = 5;
"start_time" = "2014-11-04 19:00:00";
"time_slot" = "7:00 PM";
}, {
"appointment_id" = 235;
"component_name" = "test_book";
id = 19;
"start_time" = "2014-11-04 19:00:00";
"time_slot" = "7:00 PM";
}, {
"appointment_id" = 235;
"component_name" = "New Resource";
id = 21;
"start_time" = "2014-11-04 19:00:00";
"time_slot" = "7:00 PM";
}),

time_slot = ({
"appointment_id" = 236;
"component_name" = ctbl;
id = 8;
"start_time" = "2014-11-04 22:00:00";
"time_slot" = "10:00 PM";
}, {
"appointment_id" = 236;
"component_name" = btbl;
id = 7;
"start_time" = "2014-11-04 22:00:00";
"time_slot" = "10:00 PM";
}, {
"appointment_id" = 236;
"component_name" = "New Resource";
id = 21;
"start_time" = "2014-11-04 22:00:00";
"time_slot" = "10:00 PM";
}))

我尝试过的是：Onik IV提供的解决方案。

一些更多的日志:注意"time_slot“= "7:00 PM";是我想要排序的字典数组：

代码语言：javascript
复制
Printing description of arrAllocated:
<__NSArrayM 0x19055f70>(
{
"appointment_id" = 244;
"component_name" = "badge test";
id = 20;
"start_time" = "2014-11-11 19:00:00";
"time_slot" = "7:00 PM";
},
{
"appointment_id" = 246;
"component_name" = p1;
id = 42;
"start_time" = "2014-11-11 18:00:00";
"time_slot" = "6:00 PM";
},
{
"appointment_id" = 246;
"component_name" = p2;
id = 41;
"start_time" = "2014-11-11 18:00:00";
"time_slot" = "6:00 PM";
},
{
"appointment_id" = 246;
"component_name" = p3;
id = 43;
"start_time" = "2014-11-11 18:00:00";
"time_slot" = "6:00 PM";
}, 
{
"appointment_id" = 247;
"component_name" = p4;
id = 44;
"start_time" = "2014-11-11 19:00:00";
"time_slot" = "7:00 PM";
},
{
"appointment_id" = 247;
"component_name" = p5;
id = 45;
"start_time" = "2014-11-11 19:00:00";
"time_slot" = "7:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r1;
id = 29;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r10;
id = 38;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r11;
id = 39;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r12;
id = 40;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r2;
id = 30;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r3;
id = 31;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r4;
id = 32;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r5;
id = 33;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r6;
id = 34;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r7;
id = 35;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r8;
id = 36;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r9;
id = 37;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
}
)

在使用Onik IV方法进行排序之后，我将注意"time_slot“= "7:00 PM";：

代码语言：javascript
复制
<__NSArrayM 0x17e9b660>(
<__NSArrayM 0x19088e80>(
{
"appointment_id" = 244;
"component_name" = "badge test";
id = 20;
"start_time" = "2014-11-11 19:00:00";
"time_slot" = "7:00 PM";
}
)
,
<__NSArrayM 0x190543b0>(
{
"appointment_id" = 246;
"component_name" = p1;
id = 42;
"start_time" = "2014-11-11 18:00:00";
"time_slot" = "6:00 PM";
},
{
"appointment_id" = 246;
"component_name" = p2;
id = 41;
"start_time" = "2014-11-11 18:00:00";
"time_slot" = "6:00 PM";
},
{
"appointment_id" = 246;
"component_name" = p3;
id = 43;
"start_time" = "2014-11-11 18:00:00";
"time_slot" = "6:00 PM";
}
)
,
<__NSArrayM 0x1905d750>
(
{
"appointment_id" = 247;
"component_name" = p4;
id = 44;
"start_time" = "2014-11-11 19:00:00";
"time_slot" = "7:00 PM";
},
{
"appointment_id" = 247;
"component_name" = p5;
id = 45;
"start_time" = "2014-11-11 19:00:00";
"time_slot" = "7:00 PM";
}
)
,
<__NSArrayM 0x190243e0>
(
{
"appointment_id" = 245;
"component_name" = r1;
id = 29;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r10;
id = 38;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r11;
id = 39;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r12;
id = 40;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r2;
id = 30;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r3;
id = 31;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r4;
id = 32;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r5;
id = 33;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r6;
id = 34;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r7;
id = 35;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r8;
id = 36;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";
},
{
"appointment_id" = 245;
"component_name" = r9;
id = 37;
"start_time" = "2014-11-11 17:00:00";
"time_slot" = "5:00 PM";

(})

)

如果您看到"time_slot“= "7:00 PM";

它不是在其他"time_slot“=”7:00PM“的数组中分组的；

希望我能说得更清楚。谢谢和问候。

ipad
nsarray
nsdictionary
objective-c
iphone
EN

回答 2

Stack Overflow用户

回答已采纳

发布于 2014-11-04 16:29:32

以下是一种方法：

代码语言：javascript
复制
NSArray *arrAllocated; // Your initial array
NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"time_slot" ascending:YES];
NSArray *sorts = @[sort];
NSArray *orderedArrAllocated = [arrAllocated sortedArrayUsingDescriptors:sorts];

NSMutableArray *groupedFilterArray = [[NSMutableArray alloc] init];
NSMutableArray *currentMutableArray;
NSDictionary *lastObject;

for (NSDictionary *dict in orderedArrAllocated)
{
    if ([[dict valueForKey:@"time_slot"] isEqualToString:[lastObject valueForKey:@"time_slot"]])
    {
        [currentMutableArray addObject:dict];
    }
    else
    {
        NSMutableArray *newMutableArray = [[NSMutableArray alloc] initWithObjects:dict, nil];
        lastObject = dict;
        currentMutableArray = newMutableArray;
        [groupedFilterArray addObject:newMutableArray];

    }
}
票数 2
EN

Stack Overflow用户

发布于 2014-11-17 11:29:04

@orkenstein的答案在这里非常有效。但唯一的问题是，如果您不保存匹配的数组，它将被覆盖。为此，您可以使用NSMutableArray并在For循环中添加匹配的数组。我没有足够的声誉来发布这条评论，所以我把它作为回应。:)

代码语言：javascript
复制
-(void)filteredArray
{
      NSArray *yourArray = originalArray;
      // Get all time slots
      NSArray *allTimeSlotsArray = [yourArray valueForKey:@"time_slot"];
      // Remove duplucates
      NSSet *allTimeSlotsSet = [NSSet setWithArray:allTimeSlotsArray];
      // Enumerate
    for (NSString *timeSlot in allTimeSlotsSet) {
        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"time_slot == %@", timeSlot];
        NSArray *matchingArray = [yourArray filteredArrayUsingPredicate:predicate];
        [finalArray addObjectsFromArray:matchingArray];
    }
    NSLog(@"Filtered Array : %@",finalArray);
}

finalArray是一个NSMutableArray对象。

票数 2
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/26737104

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