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标题: ios - 按数字对字典数组进行排序 [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-13 03:14
标题: ios - 按数字对字典数组进行排序

所以我有一个包含大约 180 个字典的数组，每个字典中有 5 个对象(3 个字符串和 2 个 NSNumber)

我正在尝试按其属性之一对每个字典进行排序，这对字符串很有效，但是当涉及到数字时，它无法正确排序。

 -(void) sortArrayByint)sortingNumber {

    switch (sortingNumber) {
            case 0:
                NSLog(@"sorting by atomicnumber");
                [self.elementsArray sortUsingDescriptors:[NSArray arrayWithObjects:
 // When sorting this comes back the same each time but not in the correct order
                [NSSortDescriptor sortDescriptorWithKey"ATOMIC NUMBER" ascending:YES], nil]];
                break;
            case 1:
                NSLog(@"sorting by name");
                [self.elementsArray sortUsingDescriptors:[NSArray arrayWithObjects: [NSSortDescriptor sortDescriptorWithKey"ELEMENT NAME" ascending:YES], nil]];
                break;
            case 2:
                NSLog(@"sorting by symbol");
                [self.elementsArray sortUsingDescriptors:[NSArray arrayWithObjects: [NSSortDescriptor sortDescriptorWithKey"CHEMICAL SYMBOL" ascending:YES], nil]];
                break;
            case 3:
                NSLog(@"sorting by mass");
 // When sorting this comes back the same each time but not in the correct order
                [self.elementsArray sortUsingDescriptors:[NSArray arrayWithObjects: [NSSortDescriptor sortDescriptorWithKey"ATOMIC MASS" ascending:YES], nil]];
                break;

            default:
                break;
        }

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Best Answer-推荐答案

好的，所以我发现了问题，由于某种原因，它是按第一个数字而不是整数排序，所以我使用以下代码:

        NSSortDescriptor *sortDescriptor = [NSSortDescriptor 

sortDescriptorWithKey"ATOMIC MASS" ascending:YES comparator:^(id obj1, id obj2) {
                return [obj1 comparebj2 options:NSNumericSearch];
            }];

            [self.elementsArray sortUsingDescriptors:[NSArray arrayWithObjects: sortDescriptor, nil]];

关于ios - 按数字对字典数组进行排序，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17920564/

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