Alamofire反复返回列表页触发DidFinishCollectingMetrics崩溃求助

我的应用包含列表页与详情页，在详情页的网络请求完成前反复点击导航栏返回按钮，Alamofire出现崩溃，完整崩溃日志如下：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[APMURLSessionDelegateProxy URLSession:task:didFinishCollectingMetrics:]: unrecognized selector sent to instance 0x282842000'
*** First throw call stack:
(0x180817d1c 0x19803cee4 0x1808e875c 0x1807b135c 0x1807b082c 0x180f84aa8 0x114b9c700 0x114b9dfc8 0x114ba5150 0x114ba5e10 0x114bb163c 0x1dbc20e10 0x1dbc2093c)
libc++abi: terminating with uncaught exception of type NSException
dyld4 config: DYLD_LIBRARY_PATH=/usr/lib/system/introspection DYLD_INSERT_LIBRARIES=/Developer/usr/lib/libBacktraceRecording.dylib:/Developer/usr/lib/libMainThreadChecker.dylib:/Developer/Library/PrivateFrameworks/DTDDISupport.framework/libViewDebuggerSupport.dylib
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[APMURLSessionDelegateProxy URLSession:task:didFinishCollectingMetrics:]: unrecognized selector sent to instance 0x282842000'
terminating with uncaught exception of type NSException
23DF-26B4-45FA-95D9-D270455FA2D

已在闭包中使用弱引用以避免内存泄漏。

1. 页面销毁时主动取消未完成请求 #

在详情页的deinit方法中，取消当前页面发起的所有Alamofire请求，切断URLSession后续回调：

class DetailViewController: UIViewController {
    private var dataRequest: DataRequest?

    func fetchData() {
        dataRequest = AF.request("your_request_url").responseJSON { [weak self] response in
            // 响应处理逻辑
        }
    }

    deinit {
        dataRequest?.cancel()
    }
}

2. 修复APM代理的方法缺失问题 #

崩溃核心原因是APMURLSessionDelegateProxy未实现iOS 10+新增的URLSession:task:didFinishCollectingMetrics:代理方法，可通过以下方式解决：

• 升级所用APM SDK至最新版本，新版本通常会补全所有必需的URLSession代理方法；
• 若为自定义APM代理类，手动添加该方法的空实现或转发逻辑：

extension APMURLSessionDelegateProxy: URLSessionTaskDelegate {
    func urlSession(_ session: URLSession, task: URLSessionTask, didFinishCollecting metrics: URLSessionTaskMetrics) {
        // 空实现，或转发给原始代理对象
    }
}

3. 管理Alamofire Session生命周期 #

避免使用全局Session处理页面级请求，改为在详情页内创建独立Session实例，页面销毁时主动失效：

class DetailViewController: UIViewController {
    private var session: Session?

    override func viewDidLoad() {
        super.viewDidLoad()
        session = Session()
    }

    func fetchData() {
        session?.request("your_request_url").responseJSON { [weak self] response in
            // 响应处理逻辑
        }
    }

    deinit {
        session?.invalidateAndCancel()
    }
}

4. 临时异常捕获（治标方案） #

若需紧急阻断崩溃，可在AppDelegate中添加全局异常捕获逻辑：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    NSSetUncaughtExceptionHandler { exception in
        if exception.name == NSInvalidArgumentException && exception.reason?.contains("URLSession:task:didFinishCollectingMetrics:") == true {
            // 忽略该特定异常
            return
        }
        // 其他异常的上报或处理逻辑
    }
    return true
}

内容的提问来源于stack exchange，提问作者Özgür Ataseven