【发布时间】：2015-11-23 01:53:46
【问题描述】：
我在注释下方提到的行中遇到 SIGABRT ABORT 崩溃（let data = fbResult.objectForKey("data") as!NSMutableArray）。我只是想通过 Facebook 保存用户的分数。请注意，我无法重现此问题，并且这发生在极少数设备上。我刚刚通过崩溃报告发现了这个问题。
var fbScore = 0
func getFBScore(){
if(FBSDKAccessToken.currentAccessToken() != nil){
var request = FBSDKGraphRequest(graphPath: "me/scores?fields=score", parameters: nil)
request.startWithCompletionHandler({(connection, result, error) -> Void in
if(error != nil){
println("facebook score reading failed with error \(error)")
} else {
println("facebook score reading result \(result)")
let fbResult = result as! NSDictionary
//crash on below line
let data = fbResult.objectForKey("data") as! NSMutableArray
if(data.count == 0){
self.postFBScore(0)
} else {
if let mScore = data[0].objectForKey("score") as? Int{
self.fbScore = mScore
println("facebook score is \(self.fbScore)")
} else{
self.postFBScore(0)
}
}
}
})
}
}
这是我收到的崩溃报告。
线程：崩溃：com.apple.main-thread 0 libsystem_kernel.dylib 0x00000001954db270 __pthread_kill + 8 1 libsystem_pthread.dylib 0x0000000195579160 pthread_kill + 112 2 libsystem_c.dylib 0x0000000195452aa0 中止 + 112 3 libswiftCore.dylib 0x0000000100a6dd80 swift::fatalError(char const*, ...) + 182 4 libswiftCore.dylib 0x0000000100a4aefc swift::swift_dynamicCastFailure(void const*, char const*, void const*, char const*, char const*) + 70 5 libswiftCore.dylib 0x0000000100a4af80 swift::swift_dynamicCastFailure(swift::Metadata const*, swift::Metadata const*, char const*) + 130 6 libswiftCore.dylib 0x0000000100a6f6dc swift_dynamicCastObjCClassUnconditional + 72 7 MY_APP 0x00000001000e5c70 MY_APP.GameScene.(getFBScore (MY_APP.GameScene) -> () -> ()).(关闭 #1) (GameScene.swift:1600) 8 MY_APP 0x00000001003d6ea4 -[FBSDKGraphRequestMetadata invokeCompletionHandlerForConnection:withResults:error:] (FBSDKGraphRequestMetadata.m:48) 9 MY_APP 0x00000001003ddef0 __82-[FBSDKGraphRequestConnection processResultBody:error:metadata:canNotifyDelegate:]_block_invoke394 (FBSDKGraphRequestConnection.m:719) 10 MY_APP 0x00000001003ddca0 -[FBSDKGraphRequestConnection processResultBody:error:metadata:canNotifyDelegate:] (FBSDKGraphRequestConnection.m:768) 11 MY_APP 0x00000001003dd768 __64-[FBSDKGraphRequestConnection completeWithResults:networkError:]_block_invoke (FBSDKGraphRequestConnection.m:697) 12 核心基础 0x00000001832b0d48 __53-[__NSArrayM enumerateObjectsWithOptions:usingBlock:]_block_invoke + 132 13 核心基础 0x00000001832b0c2c -[__NSArrayM enumerateObjectsWithOptions:usingBlock:] + 312 14 MY_APP 0x00000001003dd500 -[FBSDKGraphRequestConnection completeWithResults:networkError:] (FBSDKGraphRequestConnection.m:679) 15 MY_APP 0x00000001003dc950 -[FBSDKGraphRequestConnection 完成FBSDKURLConnectionWithResponse:data:networkError:] (FBSDKGraphRequestConnection.m:544) 16 MY_APP 0x00000001003da910 __36-[FBSDKGraphRequestConnection 开始]_block_invoke_2 (FBSDKGraphRequestConnection.m:188) 17 MY_APP 0x00000001003d76ec -[FBSDKURLConnection invokeHandler:error:response:responseData:] (FBSDKURLConnection.m:104) 18 MY_APP 0x00000001003d7644 -[FBSDKURLConnection logAndInvokeHandler:response:responseData:] (FBSDKURLConnection.m:96) 19 MY_APP 0x00000001003d7a28 -[FBSDKURLConnection connectionDidFinishLoading:] (FBSDKURLConnection.m:143) 20 CFNetwork 0x0000000182e391e8 __65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke + 80 21 CFNetwork 0x0000000182e39178-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:] + 208 22 CFNetwork 0x0000000182e392f4 -[NSURLConnectionInternal _withActiveConnectionAndDelegate:] + 60 23 CFNetwork 0x0000000182d0bdfc ___ZN27URLConnectionClient_Classic26_delegate_didFinishLoadingEU13block_pointerFvvE_block_invoke + 104 24 CFNetwork 0x0000000182dd6120 ___ZN27URLConnectionClient_Classic18_withDelegateAsyncEPKcU13block_pointerFvP16_CFURLConnectionPK33CFURLConnectionClientCurrent_VMaxE_block_invoke_2 + 104 25 CFNetwork 0x0000000182cf7efc RunloopBlockContext::_invoke_block(void const*, void*) + 76 26 核心基础 0x000000018329c97c CFArrayApplyFunction + 68 27 CFNetwork 0x0000000182cf7da8 RunloopBlockContext::perform() + 136 28 CFNetwork 0x0000000182cf7c5c MultiplexerSource::perform() + 312 29 CFNetwork 0x0000000182cf7a88 MultiplexerSource::_perform(void*) + 68 30 核心基础 0x0000000183373f8c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24 31 核心基础 0x0000000183373230 __CFRunLoopDoSources0 + 264 32 核心基础 0x00000001833712e0 __CFRunLoopRun + 712 33 核心基础 0x000000018329cf74 CFRunLoopRunSpecific + 396 34 图形服务 0x000000018cba76fc GSEventRunModal + 168 35 UIKit 0x0000000187e9ed94 UIApplicationMain + 1488 36 MY_APP 0x00000001000f6c58 主（AppDelegate.swift:16） 37 libdyld.dylib 0x00000001953c2a08 开始 + 4当我尝试在控制台上打印 fbResult 时，这就是我得到的结果。
{ 数据 = ( { 分数 = 41; 用户 = { ID = 10206371034343540； name = "罗希特戈亚尔"; }; } ); }
【问题讨论】：
-
您将 fbResult.objectForKey("data") 向下转换为 NSMutableArray。如果已知字典键仅包含 NSMutableArray 实例，则可以使用强制类型转换运算符（as！）的强制版本向下转换并直接解包为非可选 NSMutableArray：您可以在控制台中打印 fbResult 并共享吗？
-
data键是一个数组？在这里打印结果控制台，或者如果它长期使用pastie。 -
@Prabhu.Somasundaram 在这里。 { data = ( { score = 41; user = { id = 10206371034343540; name = "Rohit Goyal"; }; } ); }
-
@Prabhu.Somasundaram 当我在图形 api 工具浏览器上尝试同样的事情时，它给了我一个数组。在 iOS 上，我得到的是括号而不是括号。这有什么区别吗。请注意，它在我的设备上运行良好。有什么想法吗？
-
@iAshish 请阅读我上面的评论并分享您的观点。
标签： ios swift facebook-ios-sdk