删除数组元素并将它们添加到同一索引 iOS

Question

我正在对数组进行排序。数组中有三种类型的元素。 1.精选 2.有机和 3. 声称。

其中，我只想对有机元素进行排序，并将特色元素和声明元素保留在自己的索引中。

下面是我的代码，我在其中提取字典中声明的索引和特征索引，因为键是索引，值是数组元素。

//Initialization
NSMutableArray *sortedArray = nil;
NSMutableDictionary *tempFeaturedDictionary = [[NSMutableDictionary alloc]init];
NSMutableDictionary *tempClaimedDictionary = [[NSMutableDictionary alloc]init];
NSMutableArray *tempOrganicArray = [[NSMutableArray alloc]init];

for (int i = 0; i < array.count; i++) {

    DRListing *isFeaturedObj = (DRListing*)[array objectAtIndex:i];

    if (isFeaturedObj.featured) {
        [tempFeaturedDictionary setObject:isFeaturedObj forKey:[@(i)stringValue]];
    }else if (isFeaturedObj.claimed)
    {
        [tempClaimedDictionary setObject:isFeaturedObj forKey:[@(i)stringValue]];
    }else
        [tempOrganicArray addObject:isFeaturedObj];

}

在排序后，我再次将声明和特色添加回其原始索引：

 sortedArray = [NSMutableArray arrayWithArray:[tempOrganicArray sortedArrayUsingDescriptors:sortDescriptorsArray]];

for (int i = 0; i<sortedArray.count; i++) {
    for (NSString *key in tempFeaturedDictionary) {
        if ( [[@(i)stringValue] isEqualToString: key] ) {
            [sortedArray insertObject:[tempFeaturedDictionary objectForKey:[@(i)stringValue]] atIndex:i];
        }}

    for (NSString *key in tempClaimedDictionary) {
        if ([[@(i)stringValue]isEqualToString:key ]) {
            [sortedArray insertObject:[tempClaimedDictionary objectForKey:[@(i)stringValue]] atIndex:i];
        }
    }
}

代码运行良好。除了在 'array' 的最后一个索引处有声明/（和）特色元素。因为在这种情况下 'sortedArray' 索引仍然小于 'array.count'。提前致谢。

更新-

我收到以下类型的响应数组：

[{featured1 featured2}, {organic1, organic2..}, {claimed1}, {featured11, featured12}, {organic11, organic12..}, {claimed2}, ..]

而且我只能对该数组中的有机元素进行排序。特色和声明不应失去其原始索引位置。

Answer 1

也许这是另一种选择：

NSMutableArray *organics = [NSMutableArray new];
NSMutableArray *others = [NSMutableArray new];

for (DRListing *isFeaturedObj in array) {
     if (isFeaturedObj.organic) {
         [organics addObject:isFeaturedObj];
     } else {
         [others addObject:isFeaturedObj];
     }
 }

 NSMutableArray *sorted = [NSMutableArray alloc]initWithObjects:organics,others, nil];

Answer 2

我会遍历数组，提取有机物进行排序。然后对您的有机阵列进行排序。然后遍历原始数组，根据需要从原始数组中获取元素或从已排序的有机物数组中获取元素。

NSMutableArray *organicsArray = [NSMutableArray new];

for (int i = 0; i < array.count; i++) {
    DRListing *isFeaturedObj = (DRListing*)array[i];

    if ((!isFeaturedObj.featured) && (!isFeaturedObj.claimed)) {
        [organicsArray addObject:isFeaturedObj];
    }
} 
NSMutableArray *sortedOrganicsArray = [[organicsArray sortedArrayUsingDescriptors:sortDescriptorsArray] mutableCopy];

NSMutableArray *outputArray = [NSMutableArray new];

for (int i = 0; i < array.count; i++) {
    DRListing *isFeaturedObj = (DRListing*)array[i];

    if ((!isFeaturedObj.featured) && (!isFeaturedObj.claimed)) {
        [outputArray addObject:sortedOrganicsArray[0]];
        [sortedOrganicsArray removeObjectAtIndex:0];
    } else {
        [outputArray addObject:isFeaturedObject];
    }
}

如果你颠倒有机物数组的排序顺序，你可能会提高效率，因为那时你可以说

[outputArray addObject:[sortedOrganicsArray lastObject]];
[sortedOrganicsArray removeLastObject];

但如果您的数组不是特别大，那么性能提升可能可以忽略不计。

Answer 3

前2个函数可以使用。其他的是我用来测试的。

- (DRListing *)getNextObjectFromArray:(NSArray *)array WithStartingIndex:(int)index
{
    for (int i=index; i<array.count; i++) {
        DRListing *obj = (DRListing*)[array objectAtIndex:i];
        if (!obj.featured && !obj.claimed)
        {
            return obj;
        }
    }

    return nil;
}

- (void)sortArray:(NSMutableArray *)array
{
    for (int pass = 0; pass<array.count-1; pass++) {
        for (int i=0; i<array.count-1; i++) {
            DRListing *obj = [self getNextObjectFromArray:array WithStartingIndex:i];
            int foundIndex = (int)[array indexOfObject:obj];
            DRListing *obj2 = [self getNextObjectFromArray:array WithStartingIndex:foundIndex+1];
            int foundIndex2 = (int)[array indexOfObject:obj2];

            if (obj!=nil && obj2 !=nil) {
                if (obj.value >= obj2.value) {
                    [array exchangeObjectAtIndex:foundIndex withObjectAtIndex:foundIndex2];
                }

                i = foundIndex;
            }
        }
    }

    NSLog(@"Sorted Data: %@",array);
}

- (NSMutableArray *)testData
{
    NSMutableArray *array = [NSMutableArray new];
    for (int i=0; i<20; i++) {
        DRListing *obj = [DRListing new];
        obj.featured = i*i%2;
        obj.claimed = i%2;
        obj.value = i*3%10;
        [array addObject:obj];
    }

    NSLog(@"Test Data: %@",array);
    return array;
}

@interface DRListing : NSObject

@property (nonatomic) BOOL featured;
@property (nonatomic) BOOL claimed;
@property (nonatomic) int value;
@end

删除数组元素并将它们添加到同一索引 iOS

Remove array elements and add them at the same index iOS

arrays

objective-c

nsmutablearray

nsmutabledictionary

ios