ondrive api for ios:无法保存下载的文件（应用程序崩溃）

我需要一点帮助来理解我做错了什么

我正在尝试在iphone（或模拟器）中下载一个最初在MS oneDrive中使用oneDrive API for IOS的文件。我已正确验证，因为我能够列出文件和目录

下载具有给定文件ID的文件的代码如下：

- (void) loadFolderContent
{

        [self.liveClient getWithPath:@"file.3f40e27093d2e59e.3F40E27093D2E59E!306" 
                            delegate:self 
                           userState:@"load-file-content"];
    }


- (void) liveOperationSucceeded:(LiveOperation *)operation
{
    if ([operation.userState isEqual:@"load-file-content"])
    {
        LiveDownloadOperation *downloadOp = (LiveDownloadOperation *)operation;
        [downloadOp.data writeToFile:@"example.pdf" atomically:YES];
    }
}

文件路径file.3f40e27093d2e59e.3f40e27093d2e59e！306是文件的fileID，所以应该是ok

它在这条线上崩溃：

 [downloadOp.data writeToFile:@"example.pdf" atomically:YES]

downloadOp.data存在并且不是零，但我仍然得到错误：

-[LiveOperation data]: unrecognized selector sent to instance 0xacde910
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[LiveOperation data]: unrecognized selector sent to instance 0xacde910'
*** First throw call stack:
(
    0   CoreFoundation                      0x028881e4 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x026078e5 objc_exception_throw + 44
    2   CoreFoundation                      0x02925243 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
    3   CoreFoundation                      0x0287850b ___forwarding___ + 1019
    4   CoreFoundation                      0x028780ee _CF_forwarding_prep_0 + 14
    5   DemoApp                    0x000410f3 -[CFFlipsideViewController liveOperationSucceeded:] + 515
    6   DemoApp                    0x00050ed7 -[LiveOperationCore operationCompleted] + 335
    7   DemoApp                    0x00051060 -[LiveOperationCore connectionDidFinishLoading:] + 35
    8   Foundation                          0x023d0e49 ___NSURLConnectionDidFinishLoading_block_invoke + 40
    9   Foundation                          0x023677e1 __65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke + 62
    10  Foundation                          0x021eff5e -[NSURLConnectionInternalConnection invokeForDelegate:] + 119
    11  Foundation                          0x021efec6 -[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:] + 208
    12  Foundation                          0x021efdd8 -[NSURLConnectionInternal _withActiveConnectionAndDelegate:] + 76
    13  Foundation                          0x021f0188 _NSURLConnectionDidFinishLoading + 43
    14  CFNetwork                           0x02d1869f ___ZN27URLConnectionClient_Classic26_delegate_didFinishLoadingEU13block_pointerFvvE_block_invoke + 111
    15  CFNetwork                           0x02d163de ___ZN27URLConnectionClient_Classic18_withDelegateAsyncEPKcU13block_pointerFvP16_CFURLConnectionPK33CFURLConnectionClientCurrent_VMaxE_block_invoke_2 + 104
    16  CoreFoundation                      0x02829c69 CFArrayApplyFunction + 57
    17  CFNetwork                           0x02c7f441 _ZN19RunloopBlockContext7performEv + 155
    18  CFNetwork                           0x02d613f4 _ZThn16_N19RunloopBlockContext24multiplexerClientPerformEv + 20
    19  CFNetwork                           0x02c7f257 _ZN17MultiplexerSource7performEv + 299
    20  CFNetwork                           0x02c7f06c _ZN17MultiplexerSource8_performEPv + 76
    21  CoreFoundation                      0x0281177f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
    22  CoreFoundation                      0x0281110b __CFRunLoopDoSources0 + 235
    23  CoreFoundation                      0x0282e1ae __CFRunLoopRun + 910
    24  CoreFoundation                      0x0282d9d3 CFRunLoopRunSpecific + 467
    25  CoreFoundation                      0x0282d7eb CFRunLoopRunInMode + 123
    26  GraphicsServices                    0x039785ee GSEventRunModal + 192
    27  GraphicsServices                    0x0397842b GSEventRun + 104
    28  UIKit                               0x012c7f9b UIApplicationMain + 1225

)

我非常感谢您为解决此问题提供的帮助

谢谢，

---

dom

我不知道这个API，所以我只能做一些一般性的观察。它抱怨

downloadOp.data

，说

LiveOperation

类没有

data

方法。我看到您将其转换为

livedownloadmoperation

，但运行时并不认为该对象是这样的。因此，假设

data

属于子类，这就是报告的错误。n记录

操作的值

并查看结果。谢谢，这有助于确定问题所在。第三行：[self.liveClient downloadFromPath:@“file.3f40e27093d2e59e.3f40e27093d2e59e！306/content”是正确的，而不是[self.liveClient getWithPath:@“file.3f40e27093d2e59e.3f40e27093d2e59e！306”。将在解决方案说明中详细说明，但感谢您帮助我更仔细地思考（并查看文档…）