Question

我最近从sendSynchronousRequest切换到dataTaskWithRequest

使用sendSynchronousRequest我的方法工作正常，但当我切换到dataTaskWithRequest时，我收到以下错误：

error   NSURLError *    domain: @"NSURLErrorDomain" - code: 4294966096  0x15ee96c0

和

myError NSError *   domain: nil - code: 1684370017  0x26cce125

我不明白为什么。

这是旧代码（已注释掉）和新代码：

/*-(NSDictionary *)GetProductionScheduleData:(NSString *)areaDescription
{
    NSString *areaDescriptionWSpaceCharacters = [areaDescription stringByReplacingOccurrencesOfString:@" " withString:@"%20"];
    NSString *requestString = [NSString stringWithFormat:@"%@?areaDescription=%@",kIP,areaDescriptionWSpaceCharacters];
    NSURL *JSONURL = [NSURL URLWithString:requestString];
    NSURLResponse* response = nil;
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:JSONURL];
    NSData* data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
    if(data == nil)
        return nil;
    NSError *myError;
    NSDictionary *productionSchedule = [[NSDictionary alloc]initWithDictionary:[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&myError]];
    return productionSchedule;
}*/

-(void)GetProductionScheduleData:(NSString *)areaDescription Completetion:(void (^) (NSMutableDictionary * result,NSError * error))completion{

    NSString *areaDescriptionWSpaceCharacters = [areaDescription stringByReplacingOccurrencesOfString:@" " withString:@"%20"];
    NSString *requestString = [NSString stringWithFormat:@"%@?areaDescription=%@",kIP,areaDescriptionWSpaceCharacters];
    NSURL *JSONURL = [NSURL URLWithString:requestString];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:JSONURL];
    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                                completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
                                      {
                                          NSError *myError;
                                          NSMutableDictionary *productionSchedule = [[NSMutableDictionary alloc]initWithDictionary:[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&myError]];

                                          completion(productionSchedule,myError);

                                      }];
    [dataTask resume];

}

请帮忙！这与sendSynchronousRequest一起工作我开始不喜欢dataTaskWithRequest。

Answer 1

您拥有的NSURLSession代码是正确的，我使用有效的网址确认。

在尝试JSON解析数据之前，您已停止检查数据是否为nil。如果你加回检查，我打赌你会发现有错误，数据实际上是零。

更改为：

NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    // handle request error
    if (error) {
        completion(nil, error);
        return;
    }

    NSError *myError;
    NSMutableDictionary *productionSchedule = [[NSMutableDictionary alloc]initWithDictionary:[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&myError]];
    completion(productionSchedule,myError);
}];

我建议在尝试将myError设置为productionSchedule之前检查myError（这也可能导致崩溃）。

DataTaskWithRequest的Objective-C问题

1 个答案: