夫特MultipeerConnectivity碰撞DateComponents unconditionallyBridgeFromObjectiveC

问题描述：

我有一个可重复的碰撞，在一个EXC_BREAKPOINT下面的图像中结束，如：夫特MultipeerConnectivity碰撞DateComponents unconditionallyBridgeFromObjectiveC

步骤来重现坠毁：

连接两个设备
使用func sendResource开始传输（位于resourceURL：URL， withName resourceName：String， toPeer peerID：MCPeerID， withCompletionHandler completionHandler：（（Error？） - > Void）？ =无） - >进度？
断开通过调用FUNC断开（）

编辑发起的传输的设备：另一种重现崩溃，通过调用Progress.cancel（）步骤：

连接两个设备
开始转移并存储进度对象让进度：进度= session.sendResource（...）
调用取消进度对象，导致崩溃o n中的其他设备progress.cancel（）

我在该行didFinishReceivingResourceWithName代码：

func session(_ session: MCSession, didFinishReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, at localURL: URL, withError error: Error?) { 
    // transfer to local URL 
    MusicDownloadRequestor.sharedInstance.finishReceivingSongUploadAtLocalURL(tempUrl: localURL) 
}

看起来不像我的代码是所谓的堆栈跟踪...

* thread #25: tid = 0x806ec, 0x0000000100944af4 libswiftFoundation.dylib`static Foundation.DateComponents._unconditionallyBridgeFromObjectiveC (Swift.Optional<__ObjC.NSDateComponents>) -> Foundation.DateComponents with unmangled suffix "_merged" + 96, queue = 'com.apple.MCSession.callbackQueue', stop reason = EXC_BREAKPOINT (code=1, subcode=0x100944af4) 
frame #0: 0x0000000100944af4 libswiftFoundation.dylib`static Foundation.DateComponents._unconditionallyBridgeFromObjectiveC (Swift.Optional<__ObjC.NSDateComponents>) -> Foundation.DateComponents with unmangled suffix "_merged" + 96 
frame #1: 0x0000000100114c60 MyAppSwift`@objc NetworkManager.session(MCSession, didFinishReceivingResourceWithName : String, fromPeer : MCPeerID, at : URL, withError : Error?) ->() + 168 at NetworkManager.swift:0 
frame #2: 0x00000001a1dda028 MultipeerConnectivity`__79-[MCSession syncCloseIncomingStream:forPeer:state:error:reason:removeObserver:]_block_invoke + 208 
frame #3: 0x0000000100c05258 libdispatch.dylib`_dispatch_call_block_and_release + 24 
frame #4: 0x0000000100c05218 libdispatch.dylib`_dispatch_client_callout + 16 
frame #5: 0x0000000100c12aec libdispatch.dylib`_dispatch_queue_serial_drain + 1136 
frame #6: 0x0000000100c08ce0 libdispatch.dylib`_dispatch_queue_invoke + 672 
frame #7: 0x0000000100c14e2c libdispatch.dylib`_dispatch_root_queue_drain + 584 
frame #8: 0x0000000100c14b78 libdispatch.dylib`_dispatch_worker_thread3 + 140 
frame #9: 0x000000018c2a32a0 libsystem_pthread.dylib`_pthread_wqthread + 1288 
frame #10: 0x000000018c2a2d8c libsystem_pthread.dylib`start_wqthread + 4

更新＃1：加入堆栈跟踪文本

更新＃2：实测值的可能的引线在崩溃，here's another crash with unconditionallyBridgeFromObjectiveC

我认为问题是URL传递给didFinishReceivingResourceWithName为零，但该参数是非可选的。这是有道理的，因为如果文件无法传输，那么就不会有URL的最终安放位置。有什么办法可以解决这个问题或拦截错误？

我认为这是一个苹果的错误。有没有人有做一个解决办法的建议？

请将堆栈跟踪添加为文本。 –

@ AminNegm-Awad更新，谢谢！ – user2821647

答

使用混合匹配功能，我能够将我的MCSessionDelegate转换为Objective-C，然后将参数传递给Swift。在检查传入的值之后，我确认URL类型的变量“localURL”实际上是零，这意味着它应该被声明为可选。我向苹果提交了一个错误报告。

作为一种解决方法，在Objective-C中编写MCSessionDelegate。有几个步骤可以让Objective-C和Swift在同一个项目中一起工作，this page explains it very well。

这是我的代码。

我MCSessionDelegate头：

#import <Foundation/Foundation.h> 
#import <MultipeerConnectivity/MultipeerConnectivity.h> 
@class NetworkMCSessionTranslator; 

@interface NetworkMCSessionDelegate : NSObject <MCSessionDelegate> 
-(instancetype)initWithTranslator:(NetworkMCSessionTranslator*) trans; 
@end

我MCSessionDelegate实现文件：

#import "NetworkMCSessionDelegate.h" 
#import "MusicAppSwift-Swift.h" 

@interface NetworkMCSessionDelegate() 
@property (nonatomic) NetworkMCSessionTranslator *translator; 
@end 

@implementation NetworkMCSessionDelegate 

/* 
create a NetworkMCSessionDelegate and pass in a swift translator 
*/ 
-(instancetype)initWithTranslator:(NetworkMCSessionTranslator*) trans{ 
    if(self = [super init]){ 
     self.translator = trans; 
    } 
    return self; 
} 

/* 
Indicates that an NSData object has been received from a nearby peer. 
*/ 
- (void)session:(MCSession *)session didReceiveData:(NSData *)data fromPeer:(MCPeerID *)peerID{ 
    [self.translator networkSession:session didReceive:data fromPeer:peerID]; 
} 

/* 
Indicates that the local peer began receiving a resource from a nearby peer. 
*/ 
- (void)session:(MCSession *)session didStartReceivingResourceWithName:(NSString *)resourceName fromPeer:(MCPeerID *)peerID withProgress:(NSProgress *)progres{ 
    [self.translator networkSession:session didStartReceivingResourceWithName:resourceName fromPeer:peerID with:progres]; 
} 

/* 
Indicates that the local peer finished receiving a resource from a nearby peer. 
*/ 
- (void)session:(MCSession *)session didFinishReceivingResourceWithName:(NSString *)resourceName fromPeer:(MCPeerID *)peerID atURL:(NSURL *)localURL withError:(NSError *)error{ 
    [self.translator networkSession:session didFinishReceivingResourceWithName:resourceName fromPeer:peerID at:localURL withError:error]; 
} 

/* 
Called when the state of a nearby peer changes. 
*/ 
- (void)session:(MCSession *)session peer:(MCPeerID *)peerID didChangeState:(MCSessionState)state{ 
    [self.translator networkSession:session peer:peerID didChange:state]; 
} 

/* 
Called when a nearby peer opens a byte stream connection to the local peer. 
*/ 
- (void)session:(MCSession *)session didReceiveStream:(NSInputStream *)stream withName:(NSString *)streamName fromPeer:(MCPeerID *)peerID{ 
    // not expecting to see any of this 
} 

@end

我的雨燕文件而收集从委托交通：

import Foundation 
import MultipeerConnectivity 

@objc class NetworkMCSessionTranslator: NSObject{ 
    public func networkSession(_ session: MCSession, peer peerID: MCPeerID, didChange state: MCSessionState){ 
     ... 
    } 

    public func networkSession(_ session: MCSession, didReceive data: Data, fromPeer peerID: MCPeerID){ 
     ... 
    } 

    public func networkSession(_ session: MCSession, didFinishReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, at localURL: URL?, withError error: Error?){ 
     // !!! Notice localURL is now an OPTIONAL !!! 
    } 

    public func networkSession(_ session: MCSession, didStartReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, with progress: Progress){ 
     ... 
    } 

}

祝你好运！

答

只是让大家知道这个bug已经修复和Xcode 9测试版1的释放。根据文档和我的测试中，在localurl参数现在是可选的预期：https://developer.apple.com/documentation/multipeerconnectivity/mcsessiondelegate/1406984-session

只要更新到最后xcode9版本来解决这个问题。

答

在iOS系统7的Xcode 8.0及以上更改与localURL的功能为可选

使用此功能

func session(_ session: MCSession, didFinishReceivingResourceWithName   
resourceName: String, fromPeer peerID: MCPeerID, at localURL: URL?, 
withError error: Error?) { 

    if (localURL != nil) { 
     //enter code here 
    } 
}

而不是

func session(_ session: MCSession, didFinishReceivingResourceWithName   
resourceName: String, fromPeer peerID: MCPeerID, at localURL: URL, 
withError error: Error?) { 

}

所以，这个功能解决我的崩溃问题。如果在xcode 8中显示任何警告，请忽略它。

请解释一下？ – user1120808

夫特MultipeerConnectivity碰撞DateComponents unconditionallyBridgeFromObjectiveC

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