调解中心崩溃报告中的错误执行顺序
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【中文标题】调解中心崩溃报告中的错误执行顺序【英文标题】：Wrong order of execution in Resolution Center crash report 【发布时间】：2018-11-03 02:53:37 【问题描述】：我的应用被应用商店拒绝，因为在 iPad 上按下一个按钮会导致它崩溃。我没有 iPad，并且在任何 iPad 模拟器上都无法重现该错误。以下是调解中心发给我的崩溃报告：
"app_name":"xxx","timestamp":"2018-05-23 14:18:37.70 -0700","app_version":"0.4.5","slice_uuid":"f7e0571c-a2a9-313c-ab7b-9a9109670ff2","adam_id":1387669409,"build_version":"1","bundleID":"com.b.xxx","share_with_app_devs":false,"is_first_party":false,"bug_type":"109","os_version":"iPhone OS 11.3.1 (15E302)","incident_id":"D5ADA937-9FAF-479B-A925-7B127B5E0C44","name":"xxx"
Incident Identifier: D5ADA937-9FAF-479B-A925-7B127B5E0C44
CrashReporter Key: cac3035154ad4b589b77fd30cfea229fc2cfaf20
Hardware Model: xxx
Process: xxx [1949]
Path: /private/var/containers/Bundle/Application/FD86FF84-2DDF-4DFA-B23D-703D4A08316B/xxx.app/xxx
Identifier: com.b.xxx
Version: 1 (0.4.5)
Code Type: ARM-64 (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: com.b.xxx [1153]
Date/Time: 2018-05-23 14:18:37.5753 -0700
Launch Time: 2018-05-23 14:18:31.9754 -0700
OS Version: iPhone OS 11.3.1 (15E302)
Baseband Version: 6.55.00
Report Version: 104
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x0000000180b03644
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [0]
Triggered by Thread: 0
Application Specific Information:
BUG IN CLIENT OF LIBDISPATCH: trying to lock recursively
Filtered syslog:
None found
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libdispatch.dylib 0x0000000180b03644 _dispatch_gate_wait_slow$VARIANT$mp + 180
1 libdispatch.dylib 0x0000000180b04334 dispatch_once_f$VARIANT$mp + 132
2 libdispatch.dylib 0x0000000180b04334 dispatch_once_f$VARIANT$mp + 132
3 xxx 0x00000001006cc6ec specialized static TextFieldFactory.manufacture(for:with:) + 2868972 (TextFieldFactory.swift:13)
4 xxx 0x00000001006535ac _T09xxx22GRADEDISPLAY_MAX_WIDTH12CoreGraphics7CGFloatVvpfiAEycfU_ + 2373036 (DimensionConstants.swift:0)
5 xxx 0x00000001006532b8 globalinit_33_D344213E1027291683078D92DF0D6E22_func214 + 2372280 (DimensionConstants.swift:220)
6 libdispatch.dylib 0x0000000180b00ae4 _dispatch_client_callout + 16
7 libdispatch.dylib 0x0000000180b042ec dispatch_once_f$VARIANT$mp + 60
8 xxx 0x00000001006cc6ec specialized static TextFieldFactory.manufacture(for:with:) + 2868972 (TextFieldFactory.swift:13)
9 xxx 0x00000001006cac10 static TextFieldFactory.manufacture(for:with:) + 2862096 (TextFieldFactory.swift:0)
10 xxx 0x0000000100614f2c _T09xxx04EditA4ViewC5titleAA9TextFieldCvgAFycfU_ + 2117420 (EditClassView.swift:26)
11 xxx 0x000000010060ff90 EditClassView.beginInit() + 2097040 (EditClassView.swift:24)
12 xxx 0x00000001006bc970 MView.init(sizeConstraint:) + 2804080 (MView.swift:0)
13 xxx 0x0000000100614934 EditClassView.init(cCreateSemester:clss:sizeConstraint:) + 2115892 (EditClassView.swift:237)
14 xxx 0x00000001007184f8 specialized CCreateSemester.createCreateCourseView(_:) + 3179768 (CCreateSemester.swift:667)
15 xxx 0x000000010071393c CCreateSemester.setupNewSemester() + 3160380 (CCreateSemester.swift:594)
16 xxx 0x000000010071030c CCreateSemester.viewDidLoad() + 3146508 (CCreateSemester.swift:0)
17 xxx 0x0000000100711674 @objc CCreateSemester.viewDidLoad+ 3151476 () + 28
18 UIKit 0x000000018adeaee0 -[UIViewController loadViewIfRequired] + 1020
19 UIKit 0x000000018ae98e98 -[UINavigationController _updateScrollViewFromViewController:toViewController:] + 76
20 UIKit 0x000000018ae98354 -[UINavigationController _startTransition:fromViewController:toViewController:] + 172
21 UIKit 0x000000018ae97c90 -[UINavigationController _startDeferredTransitionIfNeeded:] + 1164
22 UIKit 0x000000018ae97720 -[UINavigationController __viewWillLayoutSubviews] + 164
23 UIKit 0x000000018ae8b424 -[UILayoutContainerView layoutSubviews] + 188
24 UIKit 0x000000018ade3770 -[UIView+ 309104 (CALayerDelegate) layoutSublayersOfLayer:] + 1420
25 QuartzCore 0x000000018538525c -[CALayer layoutSublayers] + 184
26 QuartzCore 0x00000001853893ec CA::Layer::layout_if_needed+ 1209324 (CA::Transaction*) + 324
27 QuartzCore 0x00000001852f5aa0 CA::Context::commit_transaction+ 604832 (CA::Transaction*) + 320
28 QuartzCore 0x000000018531d5d0 CA::Transaction::commit+ 767440 () + 580
29 QuartzCore 0x000000018531e450 CA::Transaction::observer_callback+ 771152 (__CFRunLoopObserver*, unsigned long, void*) + 92
30 CoreFoundation 0x00000001811b6910 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
31 CoreFoundation 0x00000001811b4238 __CFRunLoopDoObservers + 412
32 CoreFoundation 0x00000001811b4884 __CFRunLoopRun + 1436
33 CoreFoundation 0x00000001810d4da8 CFRunLoopRunSpecific + 552
34 GraphicsServices 0x00000001830b7020 GSEventRunModal + 100
35 UIKit 0x000000018b0b578c UIApplicationMain + 236
36 xxx 0x00000001004179b8 main + 31160 (PercentBasedUnequalField.swift:12)
37 libdyld.dylib 0x0000000180b65fc0 start + 4
Thread 1:
0 libsystem_kernel.dylib 0x0000000180c95d84 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000180e33eb4 _pthread_wqthread + 928
2 libsystem_pthread.dylib 0x0000000180e33b08 start_wqthread + 4
Thread 2:
0 libsystem_kernel.dylib 0x0000000180c95d84 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000180e33eb4 _pthread_wqthread + 928
2 libsystem_pthread.dylib 0x0000000180e33b08 start_wqthread + 4
Thread 3:
0 libsystem_kernel.dylib 0x0000000180c95d84 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000180e340a0 _pthread_wqthread + 1420
2 libsystem_pthread.dylib 0x0000000180e33b08 start_wqthread + 4
Thread 4:
0 libsystem_pthread.dylib 0x0000000180e33b04 start_wqthread + 0
Thread 5 name: com.apple.uikit.eventfetch-thread
Thread 5:
0 libsystem_kernel.dylib 0x0000000180c73e08 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x0000000180c73c80 mach_msg + 72
2 CoreFoundation 0x00000001811b6e40 __CFRunLoopServiceMachPort + 196
3 CoreFoundation 0x00000001811b4908 __CFRunLoopRun + 1568
4 CoreFoundation 0x00000001810d4da8 CFRunLoopRunSpecific + 552
5 Foundation 0x0000000181b49674 -[NSRunLoop+ 34420 (NSRunLoop) runMode:beforeDate:] + 304
6 Foundation 0x0000000181b4951c -[NSRunLoop+ 34076 (NSRunLoop) runUntilDate:] + 148
7 UIKit 0x000000018ad9a7e4 -[UIEventFetcher threadMain] + 136
8 Foundation 0x0000000181c59efc __NSThread__start__ + 1040
9 libsystem_pthread.dylib 0x0000000180e35220 _pthread_body + 272
10 libsystem_pthread.dylib 0x0000000180e35110 _pthread_body + 0
11 libsystem_pthread.dylib 0x0000000180e33b10 thread_start + 4
Thread 6:
0 libsystem_pthread.dylib 0x0000000180e33b04 start_wqthread + 0
Thread 7 name: RLMRealm notification listener
Thread 7:
0 libsystem_kernel.dylib 0x0000000180c7834c kevent + 8
1 Realm 0x0000000100a05a80 realm::_impl::ExternalCommitHelper::listen() + 88704 (external_commit_helper.cpp:203)
2 Realm 0x0000000100a063ec std::__1::__async_func<realm::_impl::ExternalCommitHelper::ExternalCommitHelper(realm::_impl::RealmCoordinator&)::$_0>::operator()() + 91116 (future:2323)
3 Realm 0x0000000100a06374 std::__1::__async_assoc_state<void, std::__1::__async_func<realm::_impl::ExternalCommitHelper::ExternalCommitHelper(realm::_impl::RealmCoordinator&)::$_0> >::__execute() + 90996 (future:1041)
4 Realm 0x0000000100a06524 std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (std::__1::__async_assoc_state<void, std::__1::__async_func<realm::_impl::ExternalCommitHelper::ExternalCommitHelper(realm::_impl::RealmCoordinator&)::$_0> >::*)(), std::__1::__async_assoc_state<void, std::__1::__async_func<realm::_impl::ExternalCommitHelper::ExternalCommitHelper(realm::_impl::RealmCoordinator&)::$_0> >*> >(void*, void*) + 91428 (thread:354)
5 libsystem_pthread.dylib 0x0000000180e35220 _pthread_body + 272
6 libsystem_pthread.dylib 0x0000000180e35110 _pthread_body + 0
7 libsystem_pthread.dylib 0x0000000180e33b10 thread_start + 4
Thread 8 name: RLMRealm notification listener
Thread 8:
0 libsystem_kernel.dylib 0x0000000180c7834c kevent + 8
1 Realm 0x0000000100a05a80 realm::_impl::ExternalCommitHelper::listen() + 88704 (external_commit_helper.cpp:203)
2 Realm 0x0000000100a063ec std::__1::__async_func<realm::_impl::ExternalCommitHelper::ExternalCommitHelper(realm::_impl::RealmCoordinator&)::$_0>::operator()() + 91116 (future:2323)
3 Realm 0x0000000100a06374 std::__1::__async_assoc_state<void, std::__1::__async_func<realm::_impl::ExternalCommitHelper::ExternalCommitHelper(realm::_impl::RealmCoordinator&)::$_0> >::__execute() + 90996 (future:1041)
4 Realm 0x0000000100a06524 std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (std::__1::__async_assoc_state<void, std::__1::__async_func<realm::_impl::ExternalCommitHelper::ExternalCommitHelper(realm::_impl::RealmCoordinator&)::$_0> >::*)(), std::__1::__async_assoc_state<void, std::__1::__async_func<realm::_impl::ExternalCommitHelper::ExternalCommitHelper(realm::_impl::RealmCoordinator&)::$_0> >*> >(void*, void*) + 91428 (thread:354)
5 libsystem_pthread.dylib 0x0000000180e35220 _pthread_body + 272
6 libsystem_pthread.dylib 0x0000000180e35110 _pthread_body + 0
7 libsystem_pthread.dylib 0x0000000180e33b10 thread_start + 4
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x00000001007cdd68 x1: 0x0000000000000301 x2: 0x0000000000000000 x3: 0x0000000000000000
x4: 0x00000001007654a0 x5: 0x0000000000000011 x6: 0x0000000000000000 x7: 0x00000001c8041ce0
x8: 0x0000000000000003 x9: 0x0000000000000301 x10: 0x0000000000000000 x11: 0x0000000000000000
x12: 0x0000000000000001 x13: 0x0000000000000000 x14: 0x0000000000000000 x15: 0x0000000000000001
x16: 0x0000000180b042b0 x17: 0x0000000000000000 x18: 0x0000000000000000 x19: 0x0000000000000000
x20: 0x00000000ffffffff x21: 0x00000001007cdd68 x22: 0x0000000000000303 x23: 0x0000000000000001
x24: 0x0000000000000001 x25: 0x0000000101534280 x26: 0x0000000000000000 x27: 0x0000000000000001
x28: 0x0000000000000001 fp: 0x000000016f9eb140 lr: 0x0000000180b04334
sp: 0x000000016f9eb120 pc: 0x0000000180b03644 cpsr: 0x60000000
从第 11 行线程 0 向上移动是代码执行：
第 11 行：EditClassView.beginInit()
class EditClassView: MStackView
// Parent implementation does nothing
override func beginInit()
// First time `title` is referenced. It's lazy, so it's initialized here
title.text = clss.getTitle()
// Crashes before here
...
第 10 行：在 EditClassView.title's 惰性初始化器中初始化本地 title 属性：
lazy private(set) var title: TextField =
let title = TF.manufacture(for: .allPurpose, with: TParams(textSize: 21, inputView: nil, placeholder: "Class Title"))
// Crashes before here
...
()
第 9 行：我认为这只是指 TextFieldFactory.manufacture(for:with:) 引用，而不是函数本身的实际执行：
第 8 行：我不确定这是指什么。它似乎只是 TextFieldFactory.TextFieldParams 类型别名，因为这是 TextFieldFactory.swift:13 上的内容：
typealias TParams = TextFieldFactory.TextFieldParams
// Here is the definition
class TextFieldParams
static let DEFAULT_TEXT: String? = nil
static let DEFAULT_FONT_NAME = "poiretone-regular"
static let DEFAULT_TEXT_SIZE = MEDIUM_TEXT_SIZE
static let DEFAULT_TEXT_COLOR = UIColor.black
static let DEFAULT_TINT_COLOR = UIColor.black
static let DEFAULT_TEXT_ALIGNMENT = NSTextAlignment.center
static let DEFAULT_USES_AUTORESIZING_MASK = true
static let DEFAULT_INPUT_VIEW = TextFieldFactory.EMPTY_INPUT_VIEW
static let DEFAULT_PLACEHOLDER: String? = nil
static let DEFAULT_ADJUST_WIDTH_WITH_TEXT = false
static let DEFAULT_MIN_WIDTH: CGFloat? = nil
static let DEFAULT_MAX_WIDTH: CGFloat? = nil
static let DEFAULT_EMPTY_WIDTH: CGFloat? = nil
let text: String?
let fontName: String
let textSize: CGFloat
let textColor: UIColor
let tintColor: UIColor
let textAlignment: NSTextAlignment
let translatesAutoresizingMaskIntoConstraints: Bool
let inputView: UIView?
let placeholder: String?
let adjustWidthWithText: Bool
let minWidth: CGFloat?
let maxWidth: CGFloat?
let emptyWidth: CGFloat?
var font: UIFont return UIFont(name: fontName, size: textSize)!
init(text: String? = DEFAULT_TEXT,
fontName: String = DEFAULT_FONT_NAME,
textSize: CGFloat = DEFAULT_TEXT_SIZE,
textColor: UIColor = DEFAULT_TEXT_COLOR,
tintColor: UIColor = DEFAULT_TINT_COLOR,
textAlignment: NSTextAlignment = DEFAULT_TEXT_ALIGNMENT,
translatesAutoresizingMaskIntoConstraints: Bool = DEFAULT_USES_AUTORESIZING_MASK,
inputView: UIView? = DEFAULT_INPUT_VIEW,
placeholder: String? = DEFAULT_PLACEHOLDER,
adjustWidthWithText: Bool = DEFAULT_ADJUST_WIDTH_WITH_TEXT,
minWidth: CGFloat? = DEFAULT_MIN_WIDTH,
maxWidth: CGFloat? = DEFAULT_MAX_WIDTH,
emptyWidth: CGFloat? = DEFAULT_EMPTY_WIDTH
)
self.text = text
self.fontName = fontName
self.textSize = textSize
self.textColor = textColor
self.tintColor = tintColor
self.textAlignment = textAlignment
self.translatesAutoresizingMaskIntoConstraints = translatesAutoresizingMaskIntoConstraints
self.inputView = inputView
self.placeholder = placeholder
self.adjustWidthWithText = adjustWidthWithText
self.minWidth = minWidth
self.maxWidth = maxWidth
self.emptyWidth = emptyWidth
现在我迷路了。第 7 行和第 6 行根本没有引用我的代码，所以我不确定它在做什么，但接下来你知道我的一个全局常量 --GRADEDISPLAY_MAX_WIDTH -- 正在第 5 行初始化。请注意，它与EditClassView 一点关系都没有，更不用说EditClassView.title。
但在我展示它的初始化之前，有一个链接。 GRADEDISPLAY_MAX_WIDTH 在TF.manufacture(for:with:) 中被引用，但您会看到该函数只是一个大的switch 块，并且在我们应该执行的情况下没有引用GRADEDISPLAY_MAX_WIDTH，这很奇怪。如果你回头看第 10 行，你会看到相关的案例是.allPurpose，一直在函数的末尾：
static func manufacture(for textFieldPurpose: TextFieldPurpose, with params: TextFieldParams = TextFieldParams()) -> TextField
switch textFieldPurpose
case .notifyingTimeField:
var ntf = makeNotifyingFocusableTimeField(with: params as! NotifyingFocusableTimeFieldParams)
ntf.frame.size.width = CGFloat.timeFieldWidth
ntf.underline()
return ntf
case .timeField:
var ftf = makeFocusableTimeField(with: params as! FocusableTimeFieldParams)
ftf.frame.size.width = CGFloat.timeFieldWidth
ftf.underline()
return ftf
case .gradingCategoryTitle:
var tf = makeUnderlineTextField(with: UnderlineTextFieldParams(edgeInsets: UIEdgeInsetsMake(0, AC_TITLE_DEFAULT_SIDE_INSET, UnderlineLabel.DEFAULT_BOTTOM_INSET, AC_TITLE_DEFAULT_SIDE_INSET),
text: params.text,
textSize: LARGE_TEXT_SIZE,
inputView: nil,
adjustWidthWithText: true,
maxWidth: params.maxWidth)
)
tf.underline()
return tf
case .whereTextField:
var tf = makeUnderlineTextField(with: UnderlineTextFieldParams(inputView: nil,
adjustWidthWithText: true,
minWidth: WHERE_TEXTFIELD_MIN_WIDTH,
maxWidth: params.maxWidth)
)
tf.underline()
return tf
case .notifyingDateField:
var ndf = makeNotifyingFocusableDateField(with: params as! ContextualFocusableParams)
ndf.frame.size.width = CGFloat.timeFieldWidth
ndf.underline()
return ndf
case .percentTotalField, .percentEachField, .percentUnequalField, .pointsTotalField, .pointsEachField, .pointsUnequalField, .percentExamTotalField, .percentEachExamField, .percentFinalField, .pointsExamTotalField, .pointsEachExamField, .pointsFinalField:
guard let params = params as? ContextualFocusableParams else
fatalError("A ContextualFocusableParams must be passed in order to manufacture a FocusableWeightField")
var f = makeFocusableWeightField(for: textFieldPurpose, with: ContextualFocusableParams(context: params.context,
adjustWidthWithText: true,
minWidth: CGFloat.timeFieldWidth)
)
f.underline()
return f
case .customTitleField:
let edgeInsets = UIEdgeInsetsMake(0, CUSTOM_TITLE_SIDE_INSET, UnderlineLabel.DEFAULT_BOTTOM_INSET, CUSTOM_TITLE_SIDE_INSET)
var tf = makeUnderlineTextField(with: UnderlineTextFieldParams(edgeInsets: edgeInsets,
inputView: nil,
placeholder: params.placeholder,
adjustWidthWithText: true,
minWidth: params.minWidth,
maxWidth: params.maxWidth,
emptyWidth: params.emptyWidth)
)
tf.underline()
return tf
case .gradeField:
let tf = initializedTextField(textField: PercentSuffixedTextField(),
params: TParams(text: params.text,
textSize: AV_GRADE_TEXT_SIZE,
textColor: UIColor.defaultTextColor,
inputView: nil)
)
tf.frame.size = CGSize(width: GRADEDISPLAY_MAX_WIDTH, height: GV_HEIGHT)
tf.isEnabled = false
tf.keyboardType = .numberPad
return tf
case .fractionField:
let tf = makeTextField(with: TParams(text: params.text,
textSize: AV_GRADE_TEXT_SIZE,
textColor: UIColor.defaultTextColor,
inputView: nil)
)
tf.frame.size.width = GRADEDISPLAY_MAX_WIDTH
tf.isEnabled = false
tf.keyboardType = .numberPad
return tf
case .assessmentTitle:
let tf = makeTextField(with: TParams(text: params.text,
textSize: AV_TITLE_TEXT_SIZE,
textColor: UIColor.defaultTextColor,
placeholder: String.classTitlePlaceholder,
adjustWidthWithText: true)
)
tf.isEnabled = false
return tf
case .weightField:
let tf = initializedTextField(textField: PercentSuffixedTextField(adjustWidthWithText: true, minWidth: params.minWidth),
params: TParams(text: params.text,
textSize: params.textSize,
textAlignment: .right,
inputView: nil)
)
tf.keyboardType = .decimalPad
tf.performableActions = []
return tf
// `GRADEDISPLAY_MAX_WIDTH` is referenced in the `.gradeField`
// and `.fractionField` cases just above here
case .allPurpose: return makeTextField(with: params)
case .allPurposeInsetting: return makeInsetTextField(with: params as! ITParams)
第 5 行：我认为这是 GRADEDISPLAY_MAX_WIDTH 的初始化，因为 DimensionConstants.swift:220 是它的属性定义开始的地方
let GRADEDISPLAY_MAX_WIDTH: CGFloat =
let gradeField = TF.manufacture(for: .allPurpose, with: TParams(text: "100%", textSize: 17))
// From the look of the crash report, it doesn't look
// like execution makes it this far
let trailingMargin: CGFloat = 4
return proportionedWidth(gradeField.frame.size.width + trailingMargin)
()
我不确定第 4 行指的是什么。会不会是GRADEDISPLAY_MAX_WIDTH 本身？
最后是崩溃报告中对我的代码的最后引用。
第 3 行：似乎与第 8 行相同...
这里的首要任务是修复崩溃，我认为这与堆栈跟踪的第 6 行和第 7 行发生的事情有关。我可以进入我的代码库，但请相信GRADEDISPLAY_MAX_WIDTH 在EditClassView 或任何与之相关的代码中的任何地方都没有被引用，所以没有理由在EditClassView 附近的任何地方远程看到它任何堆栈跟踪。
谁能解释一下第 6 行和第 7 行发生了什么？
这可能是另一个线索：
在线程 0 的第 36 行 PercentBasedUnequalField 被引用；特别是其中的第 12 行。 PercentBasedUnequalField 实际上并没有在应用程序的执行代码中的任何地方使用。这是我正在开发的新功能的一部分。我将文件留在包中，因为删除它会很麻烦，因为当前的源分支分支了那个不完整的功能。
这里的相似之处在于，像GRADEDISPLAY_MAX_WIDTH，PercentBasedUnequalField 在TF.manufacture(for:with:) 的不相关switch 案例中也被引用。
更新
找到this similar issue，其中海报表明switch 语句的所有cases 正在作为快速优化执行。这可以解释为什么 GRADEDISPLAY_MAX_WIDTH 正在被初始化，即使访问它的 case 不匹配。我会尝试添加链接中提到的优化禁用注释，如果它解决了问题，我会更新。
【问题讨论】：
什么是 TextFieldFactory.swift 第 13 行。看起来您正在递归调用dispatch_once 块。这可能是一个 Swift 错误，但您需要弄清楚是什么触发了它，以便您可以解决它。与UIFont 相关的异常有一些命中
@Paulw11 这就是TParams 类型别名的定义：typealias TParams = TextFieldFactory.TextFieldParams
再看一遍，你对GRADEDISPLAY_MAX_WIDTH的引用导致了对TF.manufacture的递归调用。这是一件坏事™
@Paulw11 你在哪里看到原因？
嗯，它似乎导致了 dispatch_once 块的递归调用。
【参考方案1】：
显然，swift 正在执行的一项编译时优化导致 switch 语句中的所有 cases 被执行，而不管匹配模式如何。这导致我的一个全局常量被初始化，因为那是它第一次被访问的地方，如果我正确解释了崩溃报告中的Application Specific Information，这会导致一些递归：
LIBDISPATCH 客户端中的错误：尝试递归锁定
我通过将Target -> Build Settings -> Swift Compiler - Code Generation -> Optimization Level -> Release 中的版本的优化级别设置为无来解决了这个问题。
所以最终发布和调试的设置都是-Onone。
【讨论】：
我不知道为什么这个优化会导致崩溃，但是为发布目标关闭它对我有用。但是我想关闭苹果推荐的默认优化并不好。 @shoe，您对此进行过任何研究吗？ @Rendel 您在哪里看到 Apple 推荐使用 Swift 优化？ 说推荐我的意思是在构建设置中默认开启优化所以我猜这意味着苹果推荐优化swift代码 @Rendel 即使他们这样做了，推荐有益的东西和推荐避免完全破坏您的应用程序的东西之间还是有区别的。我想如果是后者，苹果会说清楚的。没有那个警告，我认为是前者。在这种情况下，放弃它们不应该导致任何负面的事情发生；只是您的应用可能运行较慢。就我而言，我什至不记得差异是可察觉的。以上是关于调解中心崩溃报告中的错误执行顺序的主要内容，如果未能解决你的问题，请参考以下文章