Question

如何在1个请求的成功块中运行多个请求并等待它完成？

[manager GET:url parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"%@ Response: \n%@", url, responseObject);
    resultsArray = [[NSMutableArray alloc] init];
    for (NSDictionary *json in [responseObject objectForKey:@"items"]) {
        [self getDetails:json];
    }

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    [SVProgressHUD dismiss]; 
}];

getDetails中的位置：（id）json是加载参数组的方法，这些请求的参数基于主请求的结果。

例如：我想从API请求学生列表，然后在成功块上。对于每个学生，我想从另一个表（另一个请求）获取相关数据并将它们放在我的NSObject上。

编辑这是我的getDetails方法

- (AFHTTPRequestOperation *)getDetails:(NSDictionary *)json
{
    NSLog(@"Start Op %@",[json objectForKey:@"related_salon"]);
    NSString *url = [NSString stringWithFormat:@"%@read/salons/%@",SERVER_API_URL,[json objectForKey:@"related_salon"]];
    NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:url]];
    AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:req];
    //op.responseSerializer = [AFJSONResponseSerializer serializer];
    [op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSLog(@"Success %@",[json objectForKey:@"name"]);

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Failed Op %@",error.localizedDescription);
    }];
    //AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:req];
    //op.responseSerializer = [AFJSONResponseSerializer serializer];
    [op start];
    return op;
}

Answer 1

AFNetworking GET方法返回ATHTTPRequestOperation（NSOperation子类）。您可以让getDetails方法返回该对象。然后，您可以创建一个新操作，该操作取决于您最后运行的那些操作：

NSOperation *completionOperation = [NSBlockOperation blockOperationWithBlock:^{
    // add here whatever you want to perform when all the getDetails calls are done,
    // e.g. maybe you want to dismiss your HUD when all the requests are done.
    [SVProgressHUD dismiss]; 
}];

[manager GET:url parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"%@ Response: \n%@", url, responseObject);
    resultsArray = [[NSMutableArray alloc] init];
    for (NSDictionary *json in [responseObject objectForKey:@"items"]) {
        NSOperation *operation = [self getDetails:json];
        [completionOperation addDependency:operation];
    }

    [[NSOperationQueue mainQueue] addOperation:completionOperation];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    [SVProgressHUD dismiss]; 
}];

同样，这假设getDetails正在进行自己的GET调用，并且您将getDetails更改为（a）捕获NSOperation返回的GET和}（b）返回它。

在循环内部运行请求操作

1 个答案: