ios - appInviteDialog didCompleteWithResults 委托(delegate)方法中的 EXC_BREAKPOINT | Facebook 应用程序邀请

Question

我从 crashlytics 收到以下崩溃报告。在 iOS 上接收 Facebook sdk 的 appInviteDialog 的委托(delegate)方法时，我的应用程序崩溃了。问题是 ImplicitlyUnwrappedOptional 所以 facebook 似乎在委托(delegate)方法上发送 nil 。但我不确定。有谁知道这是 FB SDK 上的错误还是我做错了什么？

Thread : Crashed: com.apple.main-thread
0  MY_APP                     0x00000001000a7c28 function signature specialization <Arg[0] = Owned To Guaranteed, Arg[1] = Owned To Guaranteed, Arg[2] = Owned To Guaranteed> of MY_APP.GameScene.appInviteDialog (MY_APP.GameScene)(Swift.ImplicitlyUnwrappedOptional<ObjectiveC.FBSDKAppInviteDialog>, didCompleteWithResults : Swift.ImplicitlyUnwrappedOptional<Swift.Dictionary<ObjectiveC.NSObject, Swift.AnyObject>>) -> () (GameScene.swift:1569)
1  MY_APP                     0x00000001000884c4 @objc MY_APP.GameScene.appInviteDialog (MY_APP.GameScene)(Swift.ImplicitlyUnwrappedOptional<ObjectiveC.FBSDKAppInviteDialog>, didCompleteWithResults : Swift.ImplicitlyUnwrappedOptional<Swift.Dictionary<ObjectiveC.NSObject, Swift.AnyObject>>) -> () (GameScene.swift)
2  MY_APP                     0x00000001005588a4 -[FBSDKAppInviteDialog _invokeDelegateDidCompleteWithResults:] (FBSDKAppInviteDialog.m:143)
3  MY_APP                     0x0000000100558744 -[FBSDKAppInviteDialog _handleCompletionWithDialogResults:error:] (FBSDKAppInviteDialog.m:124)
4  MY_APP                     0x0000000100558510 __28-[FBSDKAppInviteDialog show]_block_invoke (FBSDKAppInviteDialog.m:83)
5  MY_APP                     0x00000001005585f0 __28-[FBSDKAppInviteDialog show]_block_invoke64 (FBSDKAppInviteDialog.m:98)
6  MY_APP                     0x000000010038b4c4 -[FBSDKApplicationDelegate applicationDidBecomeActive:] (FBSDKApplicationDelegate.m:178)
7  CoreFoundation                 0x00000001862ee010 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 20
8  CoreFoundation                 0x000000018622b0f0 _CFXNotificationPost + 2060
9  Foundation                     0x000000018715aa80 -[NSNotificationCenter postNotificationName:object:userInfo:] + 72
10 UIKit                          0x000000018ae47298 -[UIApplication _stopDeactivatingForReason:] + 516
11 UIKit                          0x000000018b059458 -[UIApplication _handleNonLaunchSpecificActions:forScene:withTransitionContext:] + 2716
12 UIKit                          0x000000018b04f9f0 -[UIApplication workspace:didReceiveActions:] + 128
13 FrontBoardServices             0x000000018eb893c8 __31-[FBSSerialQueue performAsync:]_block_invoke_2 + 32
14 CoreFoundation                 0x00000001862fffc8 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 20
15 CoreFoundation                 0x00000001862ff0d0 __CFRunLoopDoBlocks + 312
16 CoreFoundation                 0x00000001862fd6f4 __CFRunLoopRun + 1756
17 CoreFoundation                 0x0000000186228f74 CFRunLoopRunSpecific + 396
18 GraphicsServices               0x000000018fc8b6fc GSEventRunModal + 168
19 UIKit                          0x000000018ae2ad94 UIApplicationMain + 1488
20 MY_APP                     0x00000001000c2c58 main (AppDelegate.swift:16)
21 libdyld.dylib                  0x000000019866ea08 start + 4

这是我在 GameScene 文件中的代码。请注意，这是一个委托(delegate)方法:

func appInviteDialog(appInviteDialog: FBSDKAppInviteDialog!, didCompleteWithResults results: [NSObject : AnyObject]!) {
    if(results.count == 1){
        println("facebook invite successful \(results)")
        if(self.isSaveMeButtonPressed){
            Flurry.logEvent("FBInvite")
            var build = GAIDictionaryBuilder.createEventWithCategory("Growth", action: "Facebook", label: "FBInvite", value: nil).build() as [NSObject : AnyObject]
            googleTracker.send(build)
        }
    }
}

崩溃报告中显示的行号是函数的右括号(函数的最后一行)。请注意，该应用程序并不总是崩溃，事实上，直到现在我还无法重现上述崩溃。

Answer 1

实现这两个委托(delegate)。

(void)appInviteDialog:(FBSDKAppInviteDialog *)appInviteDialog    didCompleteWithResults:(NSDictionary *)results { 
   NSLog(@"app invite result: %@", results);
}

(void)appInviteDialog:(FBSDKAppInviteDialog *)appInviteDialog didFailWithError:(NSError *)error { 
    NSLog(@"app invite error: %@", error.localizedDescription); 
}