第一个元素标记空列表字符串.崩溃只发生在生产中

Question

所以我一直把头发拉过这个神秘的问题(至少对我而言).它只发生在App Store上.我尽力检查我的BookingViewModel代码,我确信那里应该没有崩溃,所以我做了一些清理,然后上传了一个新版本到TestFlight,并再次发生崩溃.

这是Fabric's Crashlytics的崩溃日志的屏幕截图:

和一段堆栈跟踪:

#0. Crashed: com.apple.main-thread
0  libswiftCore.dylib             0x103e70314 swift_unknownRelease + 24
1  libswiftCore.dylib             0x103e37b5c swift_arrayDestroy + 68
2  libswiftCore.dylib             0x103c308c0 (Missing)
3  libswiftCore.dylib             0x103e40f04 swift_unownedCheck + 88
4  appname                        0x102940848 BookingViewModelBookingViewModelBooking first-element-marker  empty-list String (BookingViewModel.swift:167)

最后,来自我的代码BookingViewModel有崩溃日志中描述的第167行(我已经编辑了这个问题的代码,我删除了一些行,但是这个想法仍然存在,也是为了使代码简短):

init(_ booking: Booking, withCompleteInfoCompletion completeInfo: @escaping BookingViewModelCompleteInfoCompletion) {
        let createdDate = booking.createdAt ?? ""
        let username = booking.username ?? ""
        let firstName = booking.firstName ?? ""
        let lastName = booking.lastName ?? ""
        let age = booking.age ?? ""
        let birthdate = booking.birthdate ?? ""

        // Final values for completion

        let userDetails = "\(firstName) \(lastName) \(age) / \(birthdate)".condensedWhitespace

        // Booking Status and total amount

        var bookingStatus: BookingStatus = .forProcessing

        if let status = booking.status,
            let statusId = status.id,
            let newBookingStatus = BookingStatus(rawValue: statusId) {
            bookingStatus = newBookingStatus
        }

        var totalAmount: Double = 0.00

        if bookingStatus == .forPayment || bookingStatus == .paid || bookingStatus == .forConfirmation {
            if let amounts = booking.amount {
                for amount in amounts {
                    if let amountString = amount.amount,
                        let amountDouble = Double(amountString) {
                        totalAmount = totalAmount + amountDouble
                    }
                }
            }
        }

        self.subtotal = String(format: "%.2f", arguments: [totalAmount])

        // Payment Method

        var paymentType: PaymentType = .cod
        if let paymentMethod = booking.paymentMethod,
            let type = PaymentType(rawValue: paymentMethod) {
            paymentType = type
        }

        // Initial Total

        let initialTotal = "?\(self.getTotalAmount(.paypal))"

        completeInfo(
            "?\(self.subtotal)", // line 167
            userDetails
        )
    }

所以问题是:是否存在关于应用程序从App Store或Testlfight下载时如何崩溃的现有想法,而不是在开发/调试模式(在Xcode中运行)时？

此外,是否有可能在App Store上模拟项目的状态(例如,我已经阅读了某人的答案,我可以将项目的代码签名更改为iOS Distribution)？

谢谢!

Answer 1

好吧，如果有人被此类问题困扰，将导致奇怪崩溃的行放在主线程中会有所帮助！

我不确定为什么，也许我应该更多地检查代码。再说一遍，我只需将崩溃的行放入主线程中，如下所示：

DispatchQueue.main.async {
    self.bookingViewModel = BookingViewModel(self.booking, withCompleteInfoCompletion: {
    ....
    })
}

Larme 的上述评论对我帮助很大！