AFNetworking完成后返回数据 [英] Return data after AFNetworking is done

问题描述

我的代码出现了异步问题。我在一堂课上得到了所有的网络资料。我的一个请求需要返回另一个类需要使用的NSMutableArray。我的webRequest代码在这里：

I got a async problem with my code. I got all of my webrequests in 1 class. One of my requests needs to return an NSMutableArray that another class needs to use. My webRequest code is here:

- (NSMutableArray*) getTournamentsInClub:(NSString *)clubGUID withDelegateViewController:(UIViewController *)viewController {

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSMutableArray *responseArray = [[[NSMutableArray alloc] init] autorelease];
NSString *URL = [[NSString alloc]initWithFormat:@"SomeURL=%@",clubGUID];
[manager POST:URL parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {

    for (id obj in responseObject){
        //NSLog(@"obj: %@",[obj valueForKey:@"CustomerName"]);
        [responseArray addObject:obj];
    }

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@", error);
}];
return responseArray;
}

我从viewController调用这个方法：

I call the method from a viewController like this:

[self handleClubTournaments：[[TournamentsWebService sharedToursWS] getTournamentsInClub：

[self handleClubTournaments:[[TournamentsWebService sharedToursWS] getTournamentsInClub:

//Show load screen. (hide in handler function)
GP_MobilAppDelegate *xdelegate = [[UIApplication sharedApplication] delegate];
[xdelegate showLoadingScreen:self.clubToursTableView andStatus:NSLocalizedString(@"loadTours", @"")];

我的handleClubTournaments函数如下所示：

And my handleClubTournaments function looks like this:

-(void) handleClubTournaments:(id)result {

GP_MobilAppDelegate *xdelegate = [[UIApplication sharedApplication] delegate];

if([result isKindOfClass: [NSError class]]) {
    // If an error has occurred, handle it
    [xdelegate hideLoadingScreen];
    [[TournamentsWebService sharedToursWS] showErrorMessageAccordingToFault:result];
    return;
}

if([result isKindOfClass: [SoapFault class]]) {
    [xdelegate hideLoadingScreen];
    // If a server error has occurred, handle it
    [[TournamentsWebService sharedToursWS] showErrorMessageAccordingToFault:result];
    return;
}

//Do something with result...

if ([result count] > 0) {

    NSLog(@"Antal klubturneringer: %d", [result count]);
    //Start by removing excisting tours
    [self.tournamentsSourceArray removeAllObjects];
    NSMutableArray *tempArray=[NSMutableArray array];

    for (GGTournamentData *t in result) { //cast object in result list and add them to array

        [tempArray addObject:t];

    }
    self.tournamentsSourceArray = [self sortByStringDate:tempArray]; //sort by date

    [tempArray release];

    NSLog(NSLocalizedString(@"tourLoadet", @""));
}

[self.clubToursTableView reloadData];
[xdelegate hideLoadingScreen];

//Scroll view
if (self.tournamentsSourceArray.count > 0) { //hvis det er turneringer..
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:[self findIndexOfMonthClosestToDate]];
    [self.clubToursTableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
}

所以我的问题是NSMutableArray在我之前返回异步任务完成。我知道异步任务的行为与此类似，但是如何在我的webrequest（getTournamentsInClub）获取一些数据之前确保我的handleClubTournaments函数没有运行？

So my problem is that the NSMutableArray gets returned before my async task is done. I know a async task behaves like that, but how do i make sure that my handleClubTournaments function don't run before my webrequest(getTournamentsInClub) got some data for it?

在此先感谢。

推荐答案

我不认为你知道异步操作是如何工作的。永远不会设置 NSMutableArray ，因为它是同步返回的。
在您的情况下，我建议您与代表合作。

I don't think you know how Asynchronous operations work. The NSMutableArray will never be set, because it is returned synchronously. In your case, I suggest you to work with delegates.

- (void)getTournamentsInClub:(NSString *)clubGUID withDelegateViewController:(UIViewController *)viewController completionBlock:(void (^)(NSMutableArray *result))completionBlock {
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    NSMutableArray *responseArray = [[[NSMutableArray alloc] init] autorelease];
    NSString *URL = [[NSString alloc]initWithFormat:@"SomeURL=%@",clubGUID];
    [manager POST:URL parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {

        for (id obj in responseObject) {
            [responseArray addObject:obj];
        }

        // Request finished. Call the block.
        completionBlock(responseArray);

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Error: %@", error);
    }];
}

- (void)handleClubTournaments {
    GP_MobilAppDelegate *xdelegate = [[UIApplication sharedApplication] delegate];
    [[TournamentsWebService sharedToursWS] getTournamentsInClub:^(NSMutableArray *result) 
    {
         // Hide the Loading Indicator. Do something with the Result.
    }];

    // You can't access the result synchronously, therefore it's impossible to depend on it synchronously.
}

另一种异步返回数据的方法是块，类似于 AFNetworking 解决方案。

another way to return the data asynchronously would be blocks, similar to the AFNetworking solution.

您可以阅读有关块入门的更多信息这里以及如何使用代理这里。

You can read more about getting started with blocks here and how to use delegates here.

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