从 OpenWeatherMap Api 崩溃应用程序获取 NSURLSESSION 数据

Question

我正在从 NSURLSession 获取 openweathermap 天气数据。在英国，该应用程序可以完美启动并按预期加载，但是当我在英国以外加载该应用程序时，该应用程序会因为这种天气而崩溃 API。即使使用具有美国模拟位置的 Xcode 模拟器，应用程序也会崩溃。我不知道为什么？任何帮助将不胜感激。

-(void)getWeather{
NSURLSession *session = [NSURLSession sharedSession];
        NSString *urlString = [NSString stringWithFormat:@"http://api.openweathermap.org/data/2.5/weather?q=%@,%@&APPID=(APIKEYREMOVED)", city, country];
    NSURL *weatherURL = [NSURL URLWithString:urlString];
    [[session dataTaskWithURL:weatherURL
                completionHandler:^(NSData *data,
                                    NSURLResponse *response,
                                    NSError *error) {
                    [weatherIcon removeFromSuperview];
                    [temperature removeFromSuperview];
                    NSMutableDictionary *allData = [ NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
                    __block  NSString* currentWeather = nil;
                    dispatch_async(dispatch_get_main_queue(), ^{
                        weatherIcon = [[UIImageView alloc] initWithFrame:CGRectMake(14, 12, 28, 30)];
                        [weatherIcon setContentMode:UIViewContentModeScaleAspectFit];
                        [_scrollView addSubview:weatherIcon];
                        temperature = [[UILabel alloc] initWithFrame:CGRectMake(42, 11, 32, 34)];
                        temperature.text = [NSString stringWithFormat:@"%.0f%@",[allData[@"main"][@"temp"] floatValue] - 273.15, @"\u00B0"];
                        [temperature setText:[NSString stringWithFormat:@"%.0f%@",[allData[@"main"][@"temp"] floatValue] - 273.15, @"\u00B0"]];
                        [temperature setTextAlignment:NSTextAlignmentCenter];
                        [temperature setFont:[UIFont fontWithName:@"Helvetica-Light" size:21]];
                        temperature.textColor = [UIColor blackColor];
                        [_scrollView addSubview:temperature];

                        [self setWeatherIcon];

                    });
                    NSArray* weather = allData[@"weather"];
                    for (NSDictionary* weatherDictionary in weather)
                    {
                        static dispatch_once_t once;
                        dispatch_once(&once, ^ {
                            currentWeather = weatherDictionary[@"main"];
                            weatherType = currentWeather;
                        });

                    }

                }] resume];
}

错误：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'data parameter is nil'
*** First throw call stack:
(
    0   CoreFoundation                      0x0000000112a58b0b __exceptionPreprocess + 171
    1   libobjc.A.dylib                     0x0000000112154141 objc_exception_throw + 48
    2   CoreFoundation                      0x0000000112ac1625 +[NSException raise:format:] + 197
    3   Foundation                          0x000000010f311df3 +[NSJSONSerialization JSONObjectWithData:options:error:] + 67
    4   Car Mode                            0x000000010e036964 __37-[ViewController getLocalWeatherData]_block_invoke + 228
    5   CFNetwork                           0x0000000116f4787b __75-[__NSURLSessionLocal taskForClass:request:uploadFile:bodyData:completion:]_block_invoke + 19
    6   CFNetwork                           0x0000000116f47095 __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke + 143
    7   Foundation                          0x000000010f2e5237 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7
    8   Foundation                          0x000000010f2e4f3b -[NSBlockOperation main] + 101
    9   Foundation                          0x000000010f2e36f7 -[__NSOperationInternal _start:] + 627
    10  Foundation                          0x000000010f2df47c __NSOQSchedule_f + 198
    11  libdispatch.dylib                   0x000000011641605c _dispatch_client_callout + 8
    12  libdispatch.dylib                   0x00000001163f494f _dispatch_queue_serial_drain + 221
    13  libdispatch.dylib                   0x00000001163f5669 _dispatch_queue_invoke + 1084
    14  libdispatch.dylib                   0x00000001163f7ec4 _dispatch_root_queue_drain + 634
    15  libdispatch.dylib                   0x00000001163f7bef _dispatch_worker_thread3 + 123
    16  libsystem_pthread.dylib             0x00000001167a8616 _pthread_wqthread + 1299
    17  libsystem_pthread.dylib             0x00000001167a80f1 start_wqthread + 13
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

我知道数据返回 nil，但为什么它只在英国以外返回 nil？

按照建议添加 NSLog 后：

Error Domain=NSURLErrorDomain Code=-1002 "unsupported URL" UserInfo={NSLocalizedDescription=unsupported URL, NSUnderlyingError=0x61000025f5f0 {Error Domain=kCFErrorDomainCFNetwork Code=-1002 "(null)"}}

Answer 1

您需要用 stringByAddingPercentEncodingWithAllowedCharacters 和 URLQueryAllowedCharacterSet

对 URL 进行编码

从 OpenWeatherMap Api 崩溃应用程序获取 NSURLSESSION 数据

Getting NSURLSESSION data from OpenWeatherMap Api crashing app

iphone

ios

openweathermap