当mfp服务器关闭时，iOS应用程序崩溃

Question

我们用Swift 3和Xcode 8开发的iOS应用程序连接到MobileFirst Platform Foundation v8服务器上的Java适配器。当服务器关闭时，移动应用程序连接到mfp服务器时会出现错误。以下是具体步骤：

1. 停止MFP服务器
2. 登录到移动应用
3. MFP登录失败与应用程序崩溃

下面是日志跟踪：

objc[63675]: Class PLBuildVersion is implemented in both /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/AssetsLibraryServices.framework/AssetsLibraryServices (0x110f65998) and /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/PhotoLibraryServices.framework/PhotoLibraryServices (0x110d8ad38). One of the two will be used. Which one is undefined. 
2016-11-18 16:24:21.561 HealthKitConnector[63675:509167] -canOpenURL: failed for URL: "fbauth2:/" - error: "The operation couldn’t be completed. (OSStatus error -10814.)" 
2016-11-18 16:24:21.565 HealthKitConnector[63675:509167] -canOpenURL: failed for URL: "fbauth2:/" - error: "The operation couldn’t be completed. (OSStatus error -10814.)" 
2016-11-18 16:24:22.205403 HealthKitConnector[63675:509167] [MC] System group container for systemgroup.com.apple.configurationprofiles path is /Users/sudhargo/Library/Developer/CoreSimulator/Devices/EAD81986-2A0E-47B2-8C6E-CCD499B7C2AC/data/Containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles 
2016-11-18 16:24:22.205826 HealthKitConnector[63675:509167] [MC] Reading from private effective user settings. 
2016-11-18 16:24:27.137331 HealthKitConnector[63675:509167] [App] if we're in the real pre-commit handler we can't actually add any new fences due to CA restriction 
2016-11-18 16:24:33.846261 HealthKitConnector[63675:509167] [App] if we're in the real pre-commit handler we can't actually add any new fences due to CA restriction 
User has successfully logged in. 
TOKEN IS: Optional("EAAQMDtvBvmEBAGbeZAYCo8WdcqkbxM7y7mXQ81FvUDKcM81kZCIIKTOafsncm74Sr8xtxV9whsH98PpjHsvvDPWyFgeg1VdgLOXd3Ou4RLZCSRzO8P6ZC5HUyPZB1T9ZAO0CZCsRDH9ApeNMQpWoTvuPgZCHNVJs4tfGTCLlQSG5wkRgwxhD6EeaUbzTkcWdi5T516VH1ZBrXLRElIfO2Fpy93jikSYoH1MIZD") 
2016-11-18 16:24:49.216 HealthKitConnector[63675:509167] Login failed Optional("Could not connect to the server.") 
2016-11-18 16:24:49.229 HealthKitConnector[63675:509167] [FATAL] [WORKLIGHT] Uncaught Exception: *** -[NSDictionary initWithObjects:forKeys:]: count of objects (1) differs from count of keys (3) 
2016-11-18 16:24:49.231 HealthKitConnector[63675:509167] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSDictionary initWithObjects:forKeys:]: count of objects (1) differs from count of keys (3)' 
*** First throw call stack: 
(
    0 CoreFoundation      0x000000010210d34b __exceptionPreprocess + 171 
    1 libobjc.A.dylib      0x0000000101b6e21e objc_exception_throw + 48 
    2 CoreFoundation      0x0000000102077c9b -[NSDictionary initWithObjects:forKeys:] + 811 
    3 CoreFoundation      0x00000001020b5644 +[NSDictionary dictionaryWithObjects:forKeys:] + 52 
    4 IBMMobileFirstPlatformFoundation 0x0000000100fa8d0d -[WLAuthorizationManager paramsForPreauthorizationRequestWithScope:WithCredentials:] + 429 
    5 IBMMobileFirstPlatformFoundation 0x0000000100fa8022 -[WLAuthorizationManager invokePreAuthorizationRequestWithScope:WithCredentials:completionHandler:] + 722 
    6 IBMMobileFirstPlatformFoundation 0x0000000100fa398e -[WLAuthorizationManager sendLoginRequest:credentials:] + 302 
    7 IBMMobileFirstPlatformFoundation 0x0000000100fa476d __70-[WLAuthorizationManager login:withCredentials:withCompletionHandler:]_block_invoke311 + 125 
    8 IBMMobileFirstPlatformFoundation 0x0000000100fa6e96 __81-[WLAuthorizationManager invokeInstanceRegistrationRequestWithCompletionHandler:]_block_invoke + 598 
    9 IBMMobileFirstPlatformFoundation 0x0000000100fa1962 -[WLAuthorizationRequestDelegate onFailureWithResponse:userInfo:] + 642 
    10 IBMMobileFirstPlatformFoundation 0x0000000100f93812 -[WLRequest requestFailed:error:] + 3506 
    11 IBMMobileFirstPlatformFoundation 0x0000000100f3813e -[WLAFHTTPSessionManagerWrapper requestFailed:responseObject:error:] + 2398 
    12 IBMMobileFirstPlatformFoundation 0x0000000100f36e67 __38-[WLAFHTTPSessionManagerWrapper start]_block_invoke + 295 
    13 IBMMobileFirstPlatformFoundation 0x0000000100f55cfb __74-[WLAFURLSessionManagerTaskDelegate URLSession:task:didCompleteWithError:]_block_invoke + 203 
    14 libdispatch.dylib     0x000000010472b980 _dispatch_call_block_and_release + 12 
    15 libdispatch.dylib     0x00000001047550cd _dispatch_client_callout + 8 
    16 libdispatch.dylib     0x0000000104735a1d _dispatch_main_queue_callback_4CF + 733 
    17 CoreFoundation      0x00000001020d14f9 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9 
    18 CoreFoundation      0x0000000102096f8d __CFRunLoopRun + 2205 
    19 CoreFoundation      0x0000000102096494 CFRunLoopRunSpecific + 420 
    20 GraphicsServices     0x000000010791fa6f GSEventRunModal + 161 
    21 UIKit        0x0000000102530964 UIApplicationMain + 159 
    22 HealthKitConnector     0x0000000100a03ebf main + 111 
    23 libdyld.dylib      0x00000001047a168d start + 1 
) 
libc++abi.dylib: terminating with uncaught exception of type NSException 
(lldb) 

Answer 1

从错误消息中假设，在这种情况下，json响应返回nil。你需要在这里检查字典。

if(responseDict){ 
    // put your code here 
}