Objective-C EXC-BAD-ACCESS-无需ARC即可解决？

Question

供参考，我正在使用Xcode 11.3

我遇到了已发布的对象的问题，这导致EXC BAD ACCESS。好消息是我确切地知道对象是什么。我不知道该怎么解决。

这里是发生崩溃的代码...

- (void)didSendPTPCommand:(NSData*)command inData:(NSData*)data response:(NSData*)response error:(NSError*)error contextInfo:(void*)contextInfo
{
    NSLog(@"%@ %@ %@ %@", NSStringFromSelector(_cmd), data, response, error);

    PTPOperationRequest*  ptpRequest  = (__bridge PTPOperationRequest*)contextInfo;
    PTPOperationResponse* ptpResponse = NULL;

    if ( ptpRequest )

崩溃已打开：

PTPOperationRequest*  ptpRequest  = (__bridge PTPOperationRequest*)contextInfo;

此代码被从此代码中调用：

            ptpData       = NULL;
            PTPOperationRequest*  request       = [[PTPOperationRequest alloc] init];
            request.operationCode       = PTPOperationCodeInitiateCapture;
            request.numberOfParameters  = 0;
            commandBuffer               = request.commandBuffer;

            [camera requestSendPTPCommand:commandBuffer
                                  outData:NULL
                      sendCommandDelegate:self
                   didSendCommandSelector:@selector(didSendPTPCommand:inData:response:error:contextInfo:)
                              contextInfo:(__bridge void * _Nullable)(request)];

我试图通过“请求”的诅咒。很久以前，我可以通过保留/释放来管理此操作-不再。我现在该怎么办？

• David

Answer 1

我想我现在有解决方法。

__bridge_retained

因此更改了以下代码：

    [camera requestSendPTPCommand:commandBuffer
                          outData:NULL
              sendCommandDelegate:self
           didSendCommandSelector:@selector(didSendPTPCommand:inData:response:error:contextInfo:)
                      contextInfo:(__bridge_retained void * _Nullable)(request)];

我已经测试过并且可以正常工作。

• David