如何在成功块、iOS、Objective-C中返回NSArray

这是我的密码。在将数据从web服务分配到数组后，我想返回一个包含数据的数组。我需要使用块进行检查。 这是我的头文件

typedef void(^FailureBlock)(NSError *error);
typedef void(^SuccessBlock) (NSMutableArray *responseArray);

这是我的实现文件

- (void)setupConnectionWithsuccess:(SuccessBlock)success failure:(FailureBlock)failure
{
    airportArray = nil;
    NSString *airportCode = [NSString stringWithFormat:@"some code"];
    NSString *authenticationCode = [NSString stringWithFormat:@"some api"];
    NSString *baseurl = [NSString stringWithFormat:@"some url",authenticationCode,airportCode];
//    NSString *mainurlString = [NSString stringWithFormat:@""];
//    NSURL *mainurl = [NSURL URLWithString:mainurlString];

    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    [manager GET:baseurl parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {

        NSArray *mainArray = (NSArray *)responseObject;

        airportArray = [[NSMutableArray alloc] init];
        for (NSDictionary *all in mainArray) {
            airports = [all objectForKey:@"Airport"];

            [airportArray addObject:airports];
            NSLog(@"%@", airports);
        }

        if(success){
            success(airportArray);
        }

        //NSLog(@"%@", responseObject);
    }
    failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {

        if (failure) {
            failure(error);
        }
        UIAlertController *mainAlert = [UIAlertController alertControllerWithTitle:@"Something Wrong!" message:[error localizedDescription] preferredStyle:UIAlertControllerStyleAlert];
        [self presentViewController:mainAlert animated:YES completion:nil];

    }];




}

成功后，我想从这个方法返回数组。我怎么做

- (NSArray *)returnAll
{
    [self setupConnectionWithsuccess:^(NSMutableArray *responseArray) {

    } failure:^(NSError *error) {

    }];
}

---

请帮我解决这个问题。我是iOS块的新手。

尝试如下我使用id，因为在id中你可以传递任何对象

- (void)setupConnectionWithsuccess:(void (^)(id responseObject, NSError *error))completion{
airportArray = nil;
NSString *airportCode = [NSString stringWithFormat:@"some code"];
NSString *authenticationCode = [NSString stringWithFormat:@"some api"];
NSString *baseurl = [NSString stringWithFormat:@"some url",authenticationCode,airportCode];
//    NSString *mainurlString = [NSString stringWithFormat:@""];
//    NSURL *mainurl = [NSURL URLWithString:mainurlString];

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
[manager GET:baseurl parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {

    NSArray *mainArray = (NSArray *)responseObject;

    airportArray = [[NSMutableArray alloc] init];
    for (NSDictionary *all in mainArray) {
        airports = [all objectForKey:@"Airport"];

        [airportArray addObject:airports];
        NSLog(@"%@", airports);
    }

    if (completion)
        completion(responseObject,nil);

    //NSLog(@"%@", responseObject);
}
     failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {

         if (completion)
             completion(nil,error);
         UIAlertController *mainAlert = [UIAlertController alertControllerWithTitle:@"Something Wrong!" message:[error localizedDescription] preferredStyle:UIAlertControllerStyleAlert];
         [self presentViewController:mainAlert animated:YES completion:nil];

     }];}

那就叫它

[self setupConnectionWithsuccess:^(id responseObject, NSError *error) {
    if (responseObject) {
        NSLog(@"responsceObect");
    }
}];

---

当函数返回时，它什么也得不到。因为您的块以异步方式执行。您应该修改函数以处理块中的阵列数据。

您遇到了什么问题？无需检查是否（成功）和是否（失败）因为这两个块是不同的。您无法返回块中的任何内容，而必须在调用此[self-setupConnectionWithsuccess:^（NSMutableArray*responseArray）{您在此处获得nsmutable数组}失败：^（NSError*error）时在代码中调用此处接收响应时使用该块{}]；我希望在加载数据后返回数组。因此我使用returnAll方法。在她中，我希望返回responseArray。我声明了一个公共可变数组，并将其分配给Response array的值（在returnAll方法中）然后我返回它。然后我在viewdidload方法中打印它。但是它打印nullu不能从块中返回数组，因为无论何时返回任何对象，它都会在获得成功或失败之前返回，所以下次它不会返回任何内容