Question

我正在创建一个简单的游戏（iPhone应用程序），我希望用户根据积分进行排名。在应用程序首次启动时，存储所有用户点然后为用户分配排名的最佳方法是什么？我有一个服务器（一个网站），所以如果需要我可以使用SQL。有什么想法吗？

Answer 1

我建议你看一下Apple Game Center。它包含（几乎）预建的排行榜。

Answer 2

您可以使用 NSMutableURLRequest 来访问从mySQL数据库读取排名的php页面。让php输出xml并解析结果。以下代码将请求发送到php页面，然后解析该页面返回的xml。（您也可以将数据发布到不同的php页面以更新数据库条目等。）。

//IN THE .h class (of a viewController)
... : UIViewController {

  //I use a label to display the data
  IBOutlet UILabel *label1;
  //Create global variable
  NSString *tempString;
  //Dataset for response from HTTP Request
  NSMutableData *receivedData;
  NSXMLParser *xmlParser;

}

-(void) initiateAPIConnection;

@property (nonatomic, retain) NSString *tempString;

@property (nonatomic, retain) UILabel *label1;

@end
//IN THE .h class


//IN THE .m class
//...
@synthesize label1, tempString;
//...

-(void)initiateAPIConnection{

  NSString *post = [NSString stringWithFormat:@"user=Chris"];
  NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
  NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];

  NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
  [request setURL:[NSURL URLWithString:@"http://www.yourDomain.com/yourPhpPage.php"]];
  [request setHTTPMethod:@"POST"];
  [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
  [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
  [request setTimeoutInterval:10.0]; //fail after 10 seconds with no response
  [request setHTTPBody:postData];

  NSURLConnection *conn=[[[NSURLConnection alloc] initWithRequest:request delegate:self] autorelease];
  if (conn){
    NSLog(@"In if conn");
    receivedData = [[NSMutableData data] retain];
    NSLog(@"End of if conn");
  }
  else{
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Conn error" message:@"No Server" delegate:nil cancelButtonTitle:@"ok" otherButtonTitles:nil];
    [alert show];
    [alert release];
  }

}//initiateAPIConnection

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
  UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Connection error" message:[error localizedDescription] delegate:self cancelButtonTitle:@"ok" otherButtonTitles:nil];
  [alert show];
  [alert release];
}

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
  NSHTTPURLResponse *urlResponse = (NSHTTPURLResponse *)response;
  NSLog(@"%i",[urlResponse statusCode]);
  [receivedData setLength:0];
}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
  [receivedData appendData:data];
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
  xmlParser = [[NSXMLParser alloc]initWithData:receivedData];
  [xmlParser setDelegate:self];

  //you may want to enable these features of NSXMLParser.
  [xmlParser setShouldProcessNamespaces:NO];
  [xmlParser setShouldReportNamespacePrefixes:NO];
  [xmlParser setShouldResolveExternalEntities:NO];
  [xmlParser parse];
}


//XMLdeligate methods
-(void)parserDidStartDocument:(NSXMLParser *)parser{
  NSLog(@"Started Parsing");
}

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict{
  NSLog(@"Started Element name: %@", elementName);
}

-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
  NSLog(@"Found characters: %@", string);
  tempString = string;
}

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
  NSLog(@"Finished Element name: %@", elementName);

  //my outputted xml would have <ranking>...ValueFromDb...</ranking> in it's response
  if([elementName isEqualToString:@"ranking"]){
    //display result in a label (you could save it to a local variable instead)
    label1.text = tempString;
  }

}

-(void)parserDidEndDocument:(NSXMLParser *)parser{
  NSLog(@"Finished Parsing");
}


//...


//Don't forget to dealloc
-(void)dealloc {
  //...
  [label1 release];
  [tempString release];
  [xmlParser release];
  [receivedData release];
  //...
  [super dealloc];
}
//IN THE .m class

您必须在自己排名的问题中找出为用户搜索数据库所需的逻辑。您可以通过将（例如）？user = USERNAME＆amp; pass = PASSWORD附加到.php文件的末尾来传递登录信息...即...

[request setURL:[NSURL URLWithString:@"http://www.yourDomain.com/yourPhpPage.php?user=USERNAME&pass=PASSWORD"]];

USERNAME和PASSWORD将是从沙箱等读取的值...您需要格式化URLWithString（就像使用stringWithFormat一样）

-Chris Allinson

Answer 3

是的，在我看来，这是在该屏幕中使用排名功能获取或查看用户信息的最佳选择。

你可以在这个屏幕上使用不同的功能，你必须选择那些按比例排序的用户，通过这种编程你不需要做额外的工作

存储用户“排名”的最佳方式 - iPhone应用程序

3 个答案: