iphone – 如何禁用NSDictionary自动重点排序

当我在NSMutableDictionary中添加值时,它将自动设置Key.我如何禁用它,并按照第一组和第二组进行排列.

NSMutableDictionary* filteredDictionary = [NSMutableDictionary dictionary];

[filteredDictionary setObject:@"abc" forKey:@"1"];
[filteredDictionary setObject:@"abc" forKey:@"3"];
[filteredDictionary setObject:@"abc" forKey:@"2"];
[filteredDictionary setObject:@"abc" forKey:@"5"];
[filteredDictionary setObject:@"abc" forKey:@"4"];

NSLog(@"%@",filteredDictionary);

current output:
{
1 = abc;
2 = abc;
3 = abc;
4 = abc;
5 = abc;    
}

but i want 
{
1 = abc;
3 = abc;
2 = abc;
5 = abc;    
4 = abc;
}

有没有办法按照键禁用排序？

解决方法

这是一种做法：

NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"key" ascending:YES comparator:^(id obj1,id obj2) {

    if (obj1 > obj2) {
        return (NSComparisonResult)NSOrderedDescending;
    }
    if (obj1 < obj2) {
        return (NSComparisonResult)NSOrderedAscending;
    }
    return (NSComparisonResult)NSOrderedSame;
}];

NSArray *sortedKeys = [[filteredDictionary allKeys] sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];

NSMutableDictionary *orderedDictionary = [NSMutableDictionary dictionary];

for (NSString *index in sortedKeys) {
    [orderedDictionary setObject:[filteredDictionary objectForKey:index] forKey:index];
}

filteredDictionary = orderedDictionary;