【发布时间】：2012-01-27 20:39:40
【问题描述】：
我正在为 iOS 应用编写网络类。此类将处理所有日志记录和网络流量。我有一个问题，我必须一次发送可能数千个请求，但是 NSURLConnections 超时，因为在所有 NSURLConnections 启动之前不会调用委托方法，此时超时期限已过期。我正在为 Drupal 使用一个 rest API，不幸的是，我不知道用一个请求创建多个实例的方法。如何在发送回复的同时接收回复？如果我使用 GCD 来传递 NSURLConnections 的创建，那会解决问题吗？我想我必须传递遍历对象以发送和发送到 GCD 的整个操作，以释放主线程来响应响应。
-(BOOL)sendOperation:(NetworkOperation)op
NetworkDataType:(NetworkDataType)dataType
JsonToSend:(NSArray *)json
BackupData:(NSArray *)data
{
if(loggingMode)
{
return YES;
}
NSURLConnection *networkConnection;
NSData *send;
NSString *uuid = [self generateUUID];
NSMutableArray *connections = [[NSMutableArray alloc] init];
NSMutableURLRequest *networkRequest;
for (int i=0; i<[json count] && (data ? i<[data count] : YES); i++)
{
if(op == Login)
{
/*Grab all cookies from the server domain and delete them, this prevents login failure
because user was already logged in. Probably find a better solution like recovering
from the error*/
NSArray *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:
[[NSURL alloc] initWithString:networkServerAddress]];
for (NSHTTPCookie *cookie in cookies)
{
[[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie];
}
networkRequest = [[NSMutableURLRequest alloc] initWithURL:
[NSURL URLWithString:[networkServerAddress stringByAppendingString:@"/user/login"]]];
}
else if(op == StartExperiment)
{
networkRequest = [[NSMutableURLRequest alloc] initWithURL:
[NSURL URLWithString:[networkServerAddress stringByAppendingString:@"/node"]]];
}
else if(op == Event || op == EndExperiment || op == SendAll)
{
networkRequest = [[NSMutableURLRequest alloc] initWithURL:
[NSURL URLWithString:[networkServerAddress stringByAppendingString:@"/node"]]];
}
else if(op == Logout)
{
networkRequest = [[NSMutableURLRequest alloc] initWithURL:
[NSURL URLWithString:[networkServerAddress stringByAppendingString:@"/user/logout"]]];
}
send = [[json objectAtIndex:i] dataUsingEncoding:NSUTF8StringEncoding];
//Set the headers appropriately
[networkRequest setHTTPMethod:@"POST"];
[networkRequest setValue:@"application/json"
forHTTPHeaderField: @"Content-type"];
[networkRequest setValue:[NSString stringWithFormat:@"%d", [send length]]
forHTTPHeaderField:@"Content-length"];
[networkRequest setValue:@"application/json"
forHTTPHeaderField:@"Accept"];
//Set the body to the json encoded string
[networkRequest setHTTPBody:send];
//Starts async request
networkConnection = [[NSURLConnection alloc] initWithRequest:networkRequest delegate:self];
//Successfully created, we are off
if(networkConnection)
{
[networkConnectionsAndData setValue:[[NSMutableArray alloc] initWithObjects:uuid,
[[NSNumber alloc] initWithInt:op], [[NSNumber alloc] initWithInt:dataType], [[NSMutableData alloc] init], (data ? [data objectAtIndex:i] : [NSNull null]), nil]
forKey:[networkConnection description]];
}
else //Failed to conn ect
{
NSLog(@"Failed to create NSURLConnection");
return NO;
}
}
[[self networkOperationAndConnections] setObject:[[NSMutableDictionary alloc] initWithObjectsAndKeys:[[NSMutableArray alloc] initWithObjects:connections, nil], @"connections", [[NSMutableArray alloc] init], @"errors", nil]
forKey:uuid];
return YES;
}
字典用于跟踪与每个 NSURLConnection 相关的数据，并将 NSURLConnection 组合成一组以确定整个操作的最终成功或失败。
更新
AFNetworking 是完成这个项目的关键。它不仅大幅清理了代码，而且处理了发送这么多请求时继承的所有线程问题。更不用说使用 AFNetworking，我可以将所有请求批处理到一个操作中。使用块，就像 AFNetworking 使用的那样，是比 NSURLConnections 的标准委托更清洁和更好的解决方案。
【问题讨论】：
标签： objective-c ios timeout nsurlconnection grand-central-dispatch