在我的 react-native 应用程序中的 Swift 中编译器生成的崩溃
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【中文标题】在我的 react-native 应用程序中的 Swift 中编译器生成的崩溃【英文标题】：compiler-generated crash in Swift in my react-native app 【发布时间】：2020-03-21 13:24:56 【问题描述】：我的 healthkit swift 代码在生产环境中不断在后台崩溃，我这辈子都想不通。我对 Swift 还很陌生，所以也许我在实现过程中犯了一个根本性错误。
崩溃的特点：
这似乎只发生在生产中。 （我们的内部测试程序仅包含 10 台设备（所以可能巧合的是它没有在那里被拾取）。 发生在 ios 版本 - 10、11、12、13 仅针对极少数用户（活跃受众的 1.5%）发生，但对于这些相同的用户却非常频繁。请在下面从我的 Crashlytics 帐户中找到崩溃日志。
Crashed: com.facebook.react.HKManagerQueue
0 stepapp 0x100f4f324 specialized HKManager.getTotal(_:typeStr:unit:options:completion:) + 4372984612 (<compiler-generated>:4372984612)
1 stepapp 0x100f52e04 HKManager._getTotals(_:completion:) + 397 (HKManager.swift:397)
2 stepapp 0x100f532ac @objc HKManager.getTotals(_:resolver:rejecter:) + 4373000876 (<compiler-generated>:4373000876)
3 CoreFoundation 0x1af698c20 __invoking___ + 144
4 CoreFoundation 0x1af568d30 -[NSInvocation invoke] + 300
5 CoreFoundation 0x1af569908 -[NSInvocation invokeWithTarget:] + 76
6 stepapp 0x101184e6c -[RCTModuleMethod invokeWithBridge:module:arguments:] + 241556
7 stepapp 0x101187248 facebook::react::invokeInner(RCTBridge*, RCTModuleData*, unsigned int, folly::dynamic const&) + 250736
8 stepapp 0x101186fac invocation function for block in facebook::react::RCTNativeModule::invoke(unsigned int, folly::dynamic&&, int) + 250068
9 libdispatch.dylib 0x1af35e610 _dispatch_call_block_and_release + 24
10 libdispatch.dylib 0x1af35f184 _dispatch_client_callout + 16
11 libdispatch.dylib 0x1af30b404 _dispatch_lane_serial_drain$VARIANT$mp + 608
12 libdispatch.dylib 0x1af30bdf8 _dispatch_lane_invoke$VARIANT$mp + 420
13 libdispatch.dylib 0x1af315314 _dispatch_workloop_worker_thread + 588
14 libsystem_pthread.dylib 0x1af3aeb88 _pthread_wqthread + 276
15 libsystem_pthread.dylib 0x1af3b1760 start_wqthread + 8
com.apple.main-thread
0 libsystem_kernel.dylib 0x19c960634 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x19c95faa0 mach_msg + 72
2 CoreFoundation 0x19cb08288 __CFRunLoopServiceMachPort + 216
3 CoreFoundation 0x19cb033a8 __CFRunLoopRun + 1444
4 CoreFoundation 0x19cb02adc CFRunLoopRunSpecific + 464
5 GraphicsServices 0x1a6aa3328 GSEventRunModal + 104
6 UIKitCore 0x1a0c1063c UIApplicationMain + 1936
7 stepapp 0x100edf330 main + 14 (main.m:14)
8 libdyld.dylib 0x19c98c360 start + 4
com.apple.uikit.eventfetch-thread
0 libsystem_kernel.dylib 0x19c960634 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x19c95faa0 mach_msg + 72
2 CoreFoundation 0x19cb08288 __CFRunLoopServiceMachPort + 216
3 CoreFoundation 0x19cb033a8 __CFRunLoopRun + 1444
4 CoreFoundation 0x19cb02adc CFRunLoopRunSpecific + 464
5 Foundation 0x19ce42784 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 228
6 Foundation 0x19ce42664 -[NSRunLoop(NSRunLoop) runUntilDate:] + 88
7 UIKitCore 0x1a0ca8e80 -[UIEventFetcher threadMain] + 152
8 Foundation 0x19cf7309c __NSThread__start__ + 848
9 libsystem_pthread.dylib 0x19c8a5d8c _pthread_start + 156
10 libsystem_pthread.dylib 0x19c8a976c thread_start + 8
我在下面附上了我的实现，其中包含崩溃日志中提到的行
func _getTotals(_ options: Dictionary<String, Any>, completion: @escaping (Dictionary<String, Double>?) -> Void)
var stepsDone = false;
var distanceDone = false;
var caloriesDone = false;
let steps = HKQuantityType.quantityType(forIdentifier: .stepCount);
let distance = HKQuantityType.quantityType(forIdentifier: .distanceWalkingRunning);
let calories = HKQuantityType.quantityType(forIdentifier: .activeEnergyBurned);
var results = Dictionary<String, Double>();
// ???? THIS IS LINE 397 which is indicated in the crash report above
self.getTotal(steps!, typeStr: HKManager.STEP_TYPE_STR, unit: HKUnit.count(), options: options) (totalSteps, error) in
stepsDone = true;
if (totalSteps != nil)
results["steps"] = totalSteps;
if (stepsDone == true && distanceDone == true && caloriesDone == true)
return completion(results);
self.getTotal(distance!, typeStr: HKManager.DISTANCE_TYPE_STR, unit: HKUnit.meter(), options: options) (totalDistance, error) in
distanceDone = true;
if (totalDistance != nil)
results["distance"] = totalDistance;
if (stepsDone == true && distanceDone == true && caloriesDone == true)
return completion(results);
self.getTotal(calories!, typeStr: HKManager.CALORIES_TYPE_STR, unit: HKUnit.kilocalorie(), options: options) (totalCalories, error) in
caloriesDone = true;
if (totalCalories != nil)
results["calories"] = totalCalories;
if (stepsDone == true && distanceDone == true && caloriesDone == true)
return completion(results);
我还附上了上面代码中使用的 self.getTotal(...) 函数的实现。在这个函数中需要注意的是，我切换到在后台 qos 中执行我的 HealthKit 查询，以确保这些查询不会在主线程上运行。我认为这可能是导致崩溃的原因。
func getTotal(_ type: HKQuantityType, typeStr: String, unit: HKUnit, options: Dictionary<String, Any>, completion: @escaping (Double?, Error?) -> Void)
guard (self.healthStore != nil) else
let error = NSError(domain: "Healthkit not initialized", code: 50, userInfo: [:]);
return completion(nil, error);
var start: Date;
if (options["startDate"] != nil)
start = self.strToDate(dateStr: options["startDate"] as! String);
else
let date = Date()
let cal = Calendar(identifier: .gregorian)
let midnight = cal.startOfDay(for: date);
start = midnight;
var ignoreMin = false;
if (options["ignoreMin"] != nil)
ignoreMin = options["ignoreMin"] as! Bool;
if (ignoreMin != true && start < self.minStartDate && self.minStartDate != nil)
start = self.minStartDate;
var end: Date = Date();
if (options["endDate"] != nil)
end = self.strToDate(dateStr: options["endDate"] as! String);
var sources = options["sources"] as? [String];
if (sources == nil || (sources?.capacity)! < 1)
sources = ["com.apple.health."];
DispatchQueue.global(qos: .background).async [weak self] in
// fetch sources
self?.getSources(sampleTypeStr: typeStr, sampleType: type, sources: sources!) (s, error) in
if (s == nil || ((s?.capacity) ?? 0) < 1)
return completion(0.0, nil);
let sourcePredicate = HKQuery.predicateForObjects(from: s!);
// todo: enter date patterns
let datePredicate = HKQuery.predicateForSamples(withStart: start, end: end, options: []);
// predicate = [NSPredicate predicateWithFormat:@"metadata.%K != YES", HKMetadataKeyWasUserEntered];
let manualPredicate = HKQuery.predicateForObjects(withMetadataKey: HKMetadataKeyWasUserEntered, operatorType: .notEqualTo, value: "YES");
let compound = NSCompoundPredicate(andPredicateWithSubpredicates: [
sourcePredicate,
datePredicate,
manualPredicate
]);
let statOptions = HKStatisticsOptions.cumulativeSum;
let query = HKStatisticsQuery.init(quantityType:type , quantitySamplePredicate: compound, options: statOptions, completionHandler: (query, results, error) in
if (error != nil)
return completion(nil, error);
var total = 0.0;
// handle if results came back as nil, or sum came back as nil
guard (results != nil && results?.sumQuantity() != nil) else
return completion(total, nil);
total = results?.sumQuantity()?.doubleValue(for: unit) ?? 0.0;
return completion(total, nil);
);
// execute stats query for step counts by source
self?.healthStore?.execute(query);
我非常感谢任何形式的帮助或指点。提前致谢。
【问题讨论】：
您能否分享完整的错误消息。基于上述，它看起来不完整。也许截图会有所帮助。 嗨，我已经添加了更多的堆栈跟踪，但老实说，它非常长 【参考方案1】：明显的问题是从多个线程并行写入字典对象。在伪代码中：
results = [:]
getTotal() // start thread 1
getTotal() // start thread 2
getTotal() // start thread 3
thread 1: write results
thread 2: write results
thread 3: write results
Swift Dictionary 不是线程安全的，必须同步并行写入。
在您的代码中，简单的更改是将DispatchQueue async 向上移动到_getTotals，并从getTotal 中删除DispatchQueue：
func _getTotals(_ options: Dictionary<String, Any>, completion: @escaping (Dictionary<String, Double>?) -> Void)
DispatchQueue.global(qos: .background).async
var results = Dictionary<String, Double>()
self.getTotal(...)
self.getTotal(...)
self.getTotal(...)
以这种方式，一切都在单个后台线程中运行； getTotal 调用一个接一个地被串行调用。
但是如果你需要并行运行getTotal，你必须同步访问results变量。这通常通过使用预定义的共享串行队列再次调用 DispatchQueue async 来完成。
【讨论】：
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