iOS开发零基础教程之AFNetWorking POST 队列请求

我们在开发过程中，经常会遇到有些页面不止一个网络请求，有时候需要两个三个甚至更多，这个时候我们就需要队列请求，下边是GET请求的多个请求放在队列里边：

NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];

    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    AFHTTPRequestOperation *operation1 = [[AFHTTPRequestOperation alloc] initWithRequest:request];

    [operation1 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

        NSLog(@"Response: %@", [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]);

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

        NSLog(@"Error: %@", error);

    }];

    

    

    NSURL *url2 = [NSURL URLWithString:@"http://www.sohu.com"];

    NSURLRequest *request2 = [NSURLRequest requestWithURL:url2];

    AFHTTPRequestOperation *operation2 = [[AFHTTPRequestOperation alloc] initWithRequest:request2];

    [operation2 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

        NSLog(@"Response2: %@", [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]);

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

        NSLog(@"Error: %@", error);

    }];

    

    

    

    NSURL *url3 = [NSURL URLWithString:@"http://www.sina.com"];

    NSURLRequest *request3 = [NSURLRequest requestWithURL:url3];

    AFHTTPRequestOperation *operation3 = [[AFHTTPRequestOperation alloc] initWithRequest:request3];

    [operation3 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

        NSLog(@"Response3: %@", [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]);

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

        NSLog(@"Error: %@", error);

    }];

    

    

    //同时请求

    NSOperationQueue *operationQueue = [[NSOperationQueue alloc] init];

    [operationQueue setMaxConcurrentOperationCount:3];

    [operationQueue addOperations:@[operation1, operation2, operation3] waitUntilFinished:NO];

 

    

    //operation2 在 operation1 请求完成后执行

    NSOperationQueue *operationQueue = [[NSOperationQueue alloc] init];

    [operation2 addDependency:operation1];

    [operationQueue addOperations:@[operation1, operation2, operation3] waitUntilFinished:NO];

下边是POST请求：

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://gowalla.com/friendships/request?user_id=1699"]];
[request setHTTPMethod:@"POST"];

NSDictionary *headers = [NSDictionary dictionaryWithObject:[NSString stringWithFormat:@"Token token=\"%@\"", kOAuthToken] forKey:@"Authorization"];
[request setAllHTTPHeaderFields:headers];

AFHTTPRequestOperation *operation = [AFHTTPRequestOperation operationWithRequest:request completion:^(NSURLRequest *request, NSHTTPURLResponse *response, NSData *data, NSError *error) {
    BOOL HTTPStatusCodeIsAcceptable = [[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(200, 100)] containsIndex:[response statusCode]];
    if (HTTPStatusCodeIsAcceptable) {
        NSLog(@"Friend Request Sent");
    } else {
        NSLog(@"[Error]: (%@ %@) %@", [request HTTPMethod], [[request URL] relativePath], error);
    }
}];

NSOperationQueue *queue = [[[NSOperationQueue alloc] init] autorelease];
[queue addOperation:operation];

参考文献：http://cocoadocs.org/docsets/AFNetworking/0.5.1/