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我正在使用以下代码连接到 Web 服务并获取响应。代码工作得很好，我正在使用连接委托 connectionDidFinishLoading 来解析结果并采取一些措施。

- (IBAction)signInTouchUpInside:(id)sender {

    if (r == NO) {

        if ([Utility internet]) {

            [self.connection cancel];

            self.json = [[NSMutableData alloc] init];

            NSString* urlString = [NSString stringWithFormat:@"http://www.domain.com/signin?email=%@&password=%@", self.email.text, self.password.text];
            NSURL* url = [NSURL URLWithString:urlString];
            NSMutableURLRequest* urlRequest = [NSMutableURLRequest requestWithURL:url];
            [urlRequest setHTTPMethod:@"GET"];
            [urlRequest addValue:@"iphonekey" forHTTPHeaderField:@"key"];

            self.connection = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];
            [self.connection start];

        } else {

        }

    }

}

- (void)connectionDidFinishLoading:(NSURLConnection*)connection {

    NSString* jsonString = [[NSString alloc] initWithData:self.json encoding:NSUTF8StringEncoding];

    SBJsonParser* parser = [[SBJsonParser alloc] init];
    NSDictionary* holder = [parser objectWithString:jsonString error:nil];

    if ([[holder valueForKey: @"result"] boolValue]) {
    } else {    
    }

}

- (void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse*)response {
    [self.json setLength:0];
}

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

- (void)connection:(NSURLConnection*)connection didFailWithError:(NSError*)error {
    NSLog(@"error %@", error);
}

现在我面临一些问题，我不知道该怎么办。我需要在多个视图控制器中进行相同的连接，所以与其一直重复自己，我认为创建一个类来管理连接会更好。此外，我在connectionDidFinishLoading中采取的动作对于每个Web服务都是不同的，所以我需要为每个调用配置一个回调。我怎样才能做到这一点？

ps：我没有并发通话。

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1 回答 1

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是的，您应该创建一个类来管理连接。对于每个连接，创建它的一个实例 -

@property (nonatomic,retain)NSURLConnection* loginConnection;
@property (nonatomic,retain)NSURLConnection* logoutConnection;
@property (nonatomic,retain)NSURLConnection* registerConnection;

在视图控制器中 -

-(IBAction)signInTouchUpInside:(id)sender{
    [[NSNotification defaultCenter]addObserver:self selector:@selector(signInResponse:) name:@"login" object:nil];

    //do something

}

-(void)signInResponse:(NSNotification*)notification{
    [[NSNotification defaultCenter]removeObserver:self name:@"login" object:nil];
    //do the callback function
}

In the new class, assign the connection -

    self.loginConnection = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];
    [self.connection start];

Then in connectionDidFinishLoading -

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{

    if (connection == loginConnection){
        [[NSNotification defaultCenter] postNotificationName:@"login" object:nil userInfo:someInfo];
    }
    if (connection == logoutConnection){
        [[NSNotification defaultCenter] postNotificationName:@"logout" object:nil userInfo:someInfo];
    }
    if (connection == registerConnection){
        [[NSNotification defaultCenter] postNotificationName:@"register" object:nil userInfo:someInfo];
    }
}

This way, you can do operations targeted for that connection.

于 2012-10-15T01:10:24.790 回答