objective-c中Nsdictionary数组排序时出现问题

Question

我必须用特定的键"likecount"按降序对数组"Array"进行排序。我已经写了下面的代码，我没有看到任何变化正在发生。这意味着排序没有执行。我在下面提到了我的控制台输出。

for (NSDictionary *wallText in wallvalue) {
    NSString *wallNameValue = [wallText objectForKey:@"message"];
    if(![[NSNull null] isEqual:wallNameValue] && [wallNameValue length])
    {
        [tableList addObject:wallNameValue];
        NSLog(@" Count Like %@",[likeCount objectAtIndex:i]);
        dict = [NSDictionary dictionaryWithObjectsAndKeys: @"message", wallNameValue, @"likecount", [likeCount objectAtIndex:i], nil];
        [array addObject:dict];
        NSLog(wallNameValue);
    }
    i++;
}
NSSortDescriptor *descriptors=[[[NSSortDescriptor alloc]initWithKey:@"likecount" ascending:YES]autorelease];
NSArray *sortdescriptor=[NSArray arrayWithObject:descriptors];
NSArray *sortedarray=[array sortedArrayUsingDescriptors:sortdescriptor];
NSLog(@"source sorting id key is %@",sortedarray);
NSLog(@"source s@@@@@@  id key is %@",array);

程序输出

source id key is (
    {
    2 = likecount;
    "This wall post is not from application. Direct from website." = message;
},
    {
    0 = likecount;
    "New integration" = message;
},
    {
    1 = likecount;
    "This is beta testing.. yes" = message;
},
    {
    2 = likecount;
    "hello wall testing.." = message;
}
)

Answer 1

您以错误的顺序声明了对象和键。应该是

dict = [NSDictionary dictionaryWithObjectsAndKeys: wallNameValue, @"message", [likeCount objectAtIndex:i], @"likecount",  nil];

这就是它没有排序的原因。

Answer 2

您的键和值使用了错误的方法。@"likecount"是值，数字是键。