AFNetWorking 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：

1. NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];
2. NSURLRequest *request = [NSURLRequest requestWithURL:url];
3. AFHTTPRequestOperation *operation1 = [[AFHTTPRequestOperation alloc] initWithRequest:request];
4. [operation1 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
5. NSLog(@"Response: %@", [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]);
6. } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
7. NSLog(@"Error: %@", error);
8. }];
9. NSURL *url2 = [NSURL URLWithString:@"http://www.sohu.com"];
10. NSURLRequest *request2 = [NSURLRequest requestWithURL:url2];
11. AFHTTPRequestOperation *operation2 = [[AFHTTPRequestOperation alloc] initWithRequest:request2];
12. [operation2 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
13. NSLog(@"Response2: %@", [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]);
14. } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
15. NSLog(@"Error: %@", error);
16. }];
17. NSURL *url3 = [NSURL URLWithString:@"http://www.sina.com"];
18. NSURLRequest *request3 = [NSURLRequest requestWithURL:url3];
19. AFHTTPRequestOperation *operation3 = [[AFHTTPRequestOperation alloc] initWithRequest:request3];
20. [operation3 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
21. NSLog(@"Response3: %@", [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]);
22. } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
23. NSLog(@"Error: %@", error);
24. }];
25. //同时请求
26. NSOperationQueue *operationQueue = [[NSOperationQueue alloc] init];
27. [operationQueue setMaxConcurrentOperationCount:3];
28. [operationQueue addOperations:@[operation1, operation2, operation3] waitUntilFinished:NO];
29. //operation2 在 operation1 请求完成后执行
30. NSOperationQueue *operationQueue = [[NSOperationQueue alloc] init];
31. [operation2 addDependency:operation1];
32. [operationQueue addOperations:@[operation1, operation2, operation3] waitUntilFinished:NO];

下边是POST请求：

1. NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://gowalla.com/friendships/request?user_id=1699"]];
2. [request setHTTPMethod:@"POST"];
3. NSDictionary *headers = [NSDictionary dictionaryWithObject:[NSString stringWithFormat:@"Token token=\"%@\"", kOAuthToken] forKey:@"Authorization"];
4. [request setAllHTTPHeaderFields:headers];
5. AFHTTPRequestOperation *operation = [AFHTTPRequestOperation operationWithRequest:request completion:^(NSURLRequest *request, NSHTTPURLResponse *response, NSData *data, NSError *error) {
6. BOOL HTTPStatusCodeIsAcceptable = [[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(200, 100)] containsIndex:[response statusCode]];
7. if (HTTPStatusCodeIsAcceptable) {
8. NSLog(@"Friend Request Sent");
9. } else {
10. NSLog(@"[Error]: (%@ %@) %@", [request HTTPMethod], [[request URL] relativePath], error);
11. }
12. }];
13. NSOperationQueue *queue = [[[NSOperationQueue alloc] init] autorelease];
14. [queue addOperation:operation];