objective-c - 根据 NSMutable 数组中的内容对 NSMutableDictionary 进行排序

Question

我有一个数组 NSMutableArray ，其值如下10、2、13、4。

还有 NSMutableDictionary 的值如下(10, a), (20, b), (13, c), (2, d), (33, e)

我想对 NSMutableDictionary 中的值进行排序，使 dict 的结果应为 (10, a), (2, d), (13, c)

Answer 1

我为你写的函数。希望对您有帮助:

- (void)removeUnnedful
{
    NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithObjectsAndKeys:
                          @"a", [NSNumber numberWithInt:10],  
                          @"b", [NSNumber numberWithInt:20], 
                          @"c", [NSNumber numberWithInt:13], 
                          @"d", [NSNumber numberWithInt:2 ],
                          @"e", [NSNumber numberWithInt:33],  
                          nil];
    NSMutableArray *array = [[NSMutableArray alloc] initWithObjects:
                             [NSNumber numberWithInt:10],
                             [NSNumber numberWithInt:2 ],
                             [NSNumber numberWithInt:13],
                             [NSNumber numberWithInt:14], nil];

    NSMutableDictionary *newDict = [[NSMutableDictionary alloc] init];
    for (NSNumber *key in [dict allKeys])
    {
        NSLog(@"%@", key);
        if ([array containsObject:key])
        {
            [newDict setObject:[dict objectForKey:key] forKey:key];
        }
    }

    for (NSNumber *key in [newDict allKeys])
        NSLog(@"key: %@, value: %@", key, [newDict objectForKey:key]);

    [dict release];
    [array release];
}