Question

我是iOS开发中的新手。我的数组包含字典值键，如

for(NSDictionary *dict in self.imageArray )
    {
    [self.imagesa addObject:@{@"demopage":[dict valueForKey:@"demopage"]}];
    }

这里我的“demoPage”键值包含两个键，如“link”和“Pageno”，此处链接包含我的ImageURL，“pageno”包含页码，如

-demopage
{
link:"URL",
 page_no: "12"
},
{
link:"URL",
page_no: "13"
},
{
link: "URL",
page_no: "14"
},
{
link: "",
page_no: "3"
},
{
 link:"URL",
 page_no: "31"
},
{
link: "URL",
page_no: "32"
},

当我解析它然后我得到数据在这个范围像12,13,14,3,31,32我想安排这个图像像页码我希望它像1,2,3至数据阵列。

Answer 1

出于某种原因，您将页码存储为字符串而不是数字。因此，简单的排序将按字母顺序排序。

即。 1,10,11,12,2,20,21,235,3,35,4

你需要它按字面数字排序，你可以这样做......

NSSortDescriptor *alphaNumSD = [NSSortDescriptor sortDescriptorWithKey:@"page_no" ascending:YES comparator:^(NSString *string1, NSString *string2) {
    return [string1 compare:string2 options:NSNumericSearch];
}];

NSArray *sortedArray = [self.theArrayYouWantToSort sortedArrayUsingDescriptors:@[alphaNumSD]];

实施例

NSArray *originalArray = @[
                           @{@"page_no": @"27"},
                           @{@"page_no": @"1"},
                           @{@"page_no": @"12"},
                           @{@"page_no": @"23"},
                           @{@"page_no": @"3"},
                           @{@"page_no": @"2"},
                           @{@"page_no": @"17"},
                           ];

NSSortDescriptor *alphaNumSD = [NSSortDescriptor sortDescriptorWithKey:@"page_no"
                                                             ascending:YES
                                                            comparator:^(NSString *string1, NSString *string2)
{
    return [string1 compare:string2 options:NSNumericSearch];
}];


NSArray *sortedArray = [originalArray sortedArrayUsingDescriptors:@[alphaNumSD]];
NSLog(@"%@", sortedArray);

输出

(
        {
        "page_no" = 1;
    },
        {
        "page_no" = 2;
    },
        {
        "page_no" = 3;
    },
        {
        "page_no" = 12;
    },
        {
        "page_no" = 17;
    },
        {
        "page_no" = 23;
    },
        {
        "page_no" = 27;
    }
)

它绝对有效。

Answer 2

NSArray *ordersArray = info[@"result"];

NSArray *properSortedArray = [ordersArray sortedArrayUsingComparator:
                              ^(id obj1, id obj2)
                              {
                                  NSInteger value1 = [[obj1 objectForKey: @"orderId"] intValue];
                                  NSInteger value2 = [[obj2 objectForKey: @"orderId"] intValue];
                                  if (value1 > value2)
                                  {
                                      return (NSComparisonResult)NSOrderedAscending;
                                  }
                                  if (value1 < value2)
                                  {
                                      return (NSComparisonResult)NSOrderedDescending;
                                  }
                                  return (NSComparisonResult)NSOrderedSame;
                              }];

Answer 3

尝试：

[self.dataArray sortedArrayUsingDescriptors:@[[NSSortDescriptor sortDescriptorWithKey:@"page_no" ascending:YES]]]

如何在iOS中对数组进行排序？

3 个答案:

实施例

输出