应用程序崩溃在访问Web服务时

Question

我有一个表视图，其中Iam选择一个表视图的行，然后它命中Web服务，检索数据然后显示。现在这是我的错误日志Iam。

由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：' -

[__NSCFData setDownloadedLogoImage:]: unrecognized selector sent to instance 0x806cf90'
*** Call stack at first throw:

(
    0   CoreFoundation                      0x02abdb99 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x02c0d40e objc_exception_throw + 47
    2   CoreFoundation                      0x02abf6ab -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
    3   CoreFoundation                      0x02a2f2b6 ___forwarding___ + 966
    4   CoreFoundation                      0x02a2ee72 _CF_forwarding_prep_0 + 50
    5   FlightSearch                       0x000401ef -[AirlineNames connectionDidFinishImage:] + 168
    6   FlightSearch                        0x0002f535 -[SAHttpManager connectionDidFinishLoading:] + 195
    7   Foundation                          0x001acb96 -[NSURLConnection(NSURLConnectionReallyInternal) sendDidFinishLoading] + 108
    8   Foundation                          0x001acaef _NSURLConnectionDidFinishLoading + 133
    9   CFNetwork                           0x0307172f _ZN19URLConnectionClient23_clientDidFinishLoadingEPNS_26ClientConnectionEventQueueE + 285
    10  CFNetwork                           0x0313cfcf _ZN19URLConnectionClient26ClientConnectionEventQueue33processAllEventsAndConsumePayloadEP20XConnectionEventInfoI12XClientEvent18XClientEventParamsEl + 389
    11  CFNetwork                           0x03066968 _ZN19URLConnectionClient13processEventsEv + 100
    12  CFNetwork                           0x030667e5 _ZN17MultiplexerSource7performEv + 251
    13  CoreFoundation                      0x02a9efaf __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
    14  CoreFoundation                      0x029fd39b __CFRunLoopDoSources0 + 571
    15  CoreFoundation                      0x029fc896 __CFRunLoopRun + 470
    16  CoreFoundation                      0x029fc350 CFRunLoopRunSpecific + 208
    17  CoreFoundation                      0x029fc271 CFRunLoopRunInMode + 97
    18  GraphicsServices                    0x032b000c GSEventRunModal + 217
    19  GraphicsServices                    0x032b00d1 GSEventRun + 115
    20  UIKit                               0x00419af2 UIApplicationMain + 1160
    21  FlightSearch                        0x00001e86 main + 84
    22  FlightSearch                        0x00001e29 start + 53
    23  ???                                 0x00000001 0x0 + 1
)

terminate called after throwing an instance of 'NSException'

请建议我该怎么做。

Answer 1

您正在向setDownloadedLogoImage:对象发送消息NSData，该对象不知道如何处理它！发生了两件事之一：

1）你没有保留一些东西。看一下你期望打电话给setDownloadedLogoImage的任何对象并找出你创建它的位置 - 你应该把它保留在那里;）

2）（不太可能）你的代码是错的！将其添加到您的问题中，我们可以看看。