如何在iPhone上按升序对NSMutableArray进行排序？

Question

我有一个SQLite数据库（DB），并将其转换为模型类，然后将DB的数据存入NSMutableArray中。我的DB类似于以下内容。 学生姓名 | 注册号码 | 入学日期 我已成功在UITableView中显示了入学日期，但我想在UITableView中按升序和降序对入学日期进行排序。 非常感谢您的帮助！

- Lion

Answer 1

你可以使用 NSSortDescriptor 和 sortUsingDescriptors:sortDescriptors 来对可变数组进行排序。

NSSortDescriptor *sortDescriptor;
sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"DatesOfJoin" ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
[array sortUsingDescriptors:sortDescriptors];
[sortDescriptor release];

- unexpectedvalue

---

这应该是“sortedArrayUsingDescriptors”。 - Pochi

不确定数组是否为可变数组。https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSMutableArray_Class/Reference/Reference.html - unexpectedvalue

Answer 2

请查看官方文档：http://developer.apple.com/library/ios/#documentation/cocoa/reference/foundation/Classes/NSArray_Class/NSArray.html 您有很多方法可以对数组进行排序：

- (NSArray *)sortedArrayUsingFunction:(NSInteger (*)(id, id, void *))comparator context:(void *)context

- (NSArray *)sortedArrayUsingSelector:(SEL)comparator

- (NSArray *)sortedArrayUsingComparator:(NSComparator)cmptr

- (NSArray *)sortedArrayWithOptions:(NSSortOptions)opts usingComparator:(NSComparator)cmptr

- Macmade

Answer 3

降序排列：

NSArray *sorted = [Arr sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    if ([obj1 intValue] < [obj2 intValue]) return NSOrderedDescending;
    else return NSOrderedAscending;
}];

升序排列：

NSArray *sorted = [Arr sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    if ([obj1 intValue] < [obj2 intValue]) return NSOrderedAscending;
    else return NSOrderedDescending;
}];

- Ketan Ubhada

Answer 4

你可以尝试使用：

NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"Over here your key" ascending:YES]; //Just write the key for which you want to have sorting & whole array would be sorted.
[self.messageAry sortUsingDescriptors:[NSArray arrayWithObjects:descriptor,nil]];
[descriptor release];

希望能够正常工作，

- Ajay Sharma

Answer 5

    NSString *res =[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
    //Sorting an array
    NSMutableArray *sortArray = [res valueForKey:@"Year"];
    NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:nil ascending:NO selector:@selector(localizedCompare:)];
    yearArray = [sortArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];

在 Swift 3.0 版本中

let sortedCapitalArray = yourArray.sorted {($0 as AnyObject).localizedCaseInsensitiveCompare(($1 as AnyObject)as! String) == ComparisonResult.orderedAscending}

- User558