如何确定我的 SIGTrap 崩溃的原因？

Question

我的团队最近发布了一个应用程序，该应用程序出现了很多 SIGTRAP 崩溃。以前我发现这些修复起来相对简单，因为它是一个糟糕的强制转换或在有问题的函数中将隐式解包的可选设置为 nil 的问题。这次虽然我找不到任何类似的东西。我最好的猜测是，由于日历错误，可能 TimeBlock objects 之一或其属性为零。

我们的应用程序是一个会议组织者，可以根据空闲时间、冲突和会议 TimeBlocks 向用户显示他们的本机 iOS 日历事件。我可以访问几个崩溃的用户的日历。

Apple SigTrap 定义

Swift code will terminate with this exception type if an unexpected condition is encountered at runtime such as:

a non-optional type with a nil value

a failed forced type conversion

崩溃函数

    /**
    Updates the conflictHours and meetingHours according to the timeblocks
    it is used as quick light reference to the button
 */
func updateTimeHours(timeblocks : [Timeblock]) {
    for timeblock in timeblocks {
        switch timeblock {
        case is MeetingTimeblock:
            for i in timeblock.startHour...timeblock.endHour {
                self.meetingHours[i] = true
            }
            break
        case is ConflictTimeblock:
            for i in timeblock.startHour...timeblock.endHour {
                self.conflictsHours[i] = true
            }
            break
        default: break
        }
    }
    updateButtonByOffset(offset: self.scrollTimeline.contentOffset.x)
}

调用崩溃函数

    /**
    This function inits the variables and button layout according to the timeblocks
 */
func handleTimeblocksDependantComponents() {
    buttonLayout()
    guard Scheduler.sharedInstance.timelines.count > SharedGlobals.Calendar.TODAY_INDEX else {
        return
    }
    updateTimeHours(timeblocks : (Scheduler.sharedInstance.timelines[SharedGlobals.Calendar.TODAY_INDEX].timeblocks))
}

SetHeaderHeight

/**
 Adjusts the height of the header depending on whether there are hosted meetings or 
 meeting VIP's or not.
*/
private func setHeaderHeight() {
    self.tableView.tableHeaderView = self.headerView
    let hostedMeetings = OverviewInteractor.getHostedMeetings(dayIndex: SharedGlobals.Calendar.SELECTED_DAY)
    let vips = OverviewInteractor.getVIPS(dayIndex: SharedGlobals.Calendar.SELECTED_DAY)

    self.tableView.beginUpdates()
    if let headerView = self.tableView.tableHeaderView {
        var height = 360.0
        if(vips.count == 0) { height -= 80.0 }
        if(hostedMeetings.count == 0) { height -= 80.0 }
        headerView.frame.size.height = CGFloat(height)
    }
    self.tableView.endUpdates()

}

时间块定义

// The Timeblock parent class. It simply holds a start and end time and provides its own duration. Not to be used as such
public class Timeblock {
    public let startTime: Date
    public let endTime: Date

    /// Returns the hour the Timeblock starts, in current timezone
    public var startHour: Int {
        get {
            return Calendar.current.component(.hour, from: startTime)
        }
    }

    /// Returns the hour the Timeblocks ends, in current timezone
    public var endHour: Int {
        get {
            return Calendar.current.component(.hour, from: endTime)
        }
    }

    /// Returns the minutes the Timeblocks starts
    public var startMinutes: Int {
        get {
            return Calendar.current.component(.minute, from: startTime)
        }
    }

    /// Returns the minutes the Timeblocks ends
    public var endMinutes: Int {
        get {
            return Calendar.current.component(.minute, from: endTime)
        }
    }

    /**
        Initialises the instance with a start and end time
        - Parameters:
            - startTime: The start time of the timeblock
            - endTime: The end time of the timeblock
    */
    public init(startTime: Date, endTime: Date) {
        self.startTime = startTime
        self.endTime = endTime
    }

    /**
        Provides the Timeblock's duration in the form of a DateInterval
        - warning: Only available on iOS 10.0 and up
        - returns: A DateInterval of the duration of the Timeblock
    */
    @available(iOS 10.0, *)
    public func getTimeInterval() -> DateInterval {
        return DateInterval(start: self.startTime, end: self.endTime)
    }

    /**
        Provides the Timeblock's duration in the form of a `Double` (number of seconds)

        - returns: The number of seconds that this Timeblock goes on for
    */
    public func getDuration() -> Double {
        return self.endTime.timeIntervalSince(self.startTime)
    }

}

崩溃报告

Incident Identifier: 98D4F477-C57B-4767-B957-E9EA2E0EE3EA CrashReporter Key: 0000000000000000000000000000000000000000 Hardware Model: undefined Process: xxxxxxx [784] Identifier:
com.xxx.xxx.xx.xxxxxxx Version: 4.0.3 Code Type:
arm64

Date/Time: Sun Dec 24 2017 09:55:23 GMT+0000 (GMT) Launch Time: Invalid Date OS Version: undefined 11.0.3 (15A432) Report Version: 105

Exception Type: SIGTRAP Exception Subtype: undefined

Thread 0 name: Thread 0 Crashed: 0 CallIn
0x0000000102c224e4 specialized TimelineHeader.updateTimeHours(timeblocks:) (TimelineHeader.swift:0) 1 CallIn 0x0000000102c20af0 TimelineHeader.handleTimeblocksDependantComponents() (TimelineHeader.swift:0) 2 CallIn
0x0000000102c7a28c specialized MeetingTableViewController.tableView(:viewForHeaderInSection:) (TimelineHeader.swift:78) 3 CallIn
0x0000000102c75d54 @objc MeetingTableViewController.tableView(:viewForHeaderInSection:) (MeetingTableViewController.swift:0) 4 UIKit
0x000000018d1157d8 -[UITableView _delegateViewForHeaderInSection:] (UIKit) 5 UIKit 0x000000018d11def0 96-[UITableView _sectionHeaderView:withFrame:forSection:floating:reuseViewIfPossible:willDisplay:]_block_invoke (UIKit) 6 UIKit 0x000000018cdf1a14 +[UIView(Animation) performWithoutAnimation:] (UIKit) 7 UIKit 0x000000018d11dc60 -[UITableView _sectionHeaderView:withFrame:forSection:floating:reuseViewIfPossible:willDisplay:] (UIKit) 8 UIKit 0x000000018cfc6c04 -[_UITableViewUpdateSupport(Private) _setupAnimationsForExistingHeadersAndFooters] (UIKit) 9 UIKit 0x000000018cfc1070 -[_UITableViewUpdateSupport _setupAnimations] (UIKit) 10 UIKit 0x000000018cfc0944 -[UITableView _updateWithItems:updateSupport:] (UIKit) 11 UIKit 0x000000018cfa8448 -[UITableView endCellAnimationsWithContext:] (UIKit) 12 UIKit 0x000000018cfa46e4 -[UITableView endUpdates] (UIKit) 13 CallIn 0x0000000102c761a4 MeetingTableViewController.setHeaderHeight() (MeetingTableViewController.swift:398) 14 CallIn
0x0000000102c7a7c8 specialized closure #1 in MeetingTableViewController.refreshTable(:) (MeetingTableViewController.swift:513) 15 CallIn
0x0000000102c7aacc partial apply for closure #1 in MeetingTableViewController.refreshTable(_:) (MeetingTableViewController.swift:0) 16 CallIn
0x0000000102cd17f0 thunk for @callee_owned () -> () (LoginPageViewController.swift:0) 17 libdispatch.dylib
0x000000018327ea54 _dispatch_call_block_and_release (libdispatch.dylib) 18 libdispatch.dylib
0x000000018327ea14 _dispatch_client_callout (libdispatch.dylib) 19 libdispatch.dylib 0x000000018328b698 _dispatch_main_queue_callback_4CF$VARIANT$mp (libdispatch.dylib) 20 CoreFoundation 0x00000001838aa544 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE (CoreFoundation) 21 CoreFoundation 0x00000001838a8120 __CFRunLoopRun (CoreFoundation) 22 CoreFoundation
0x00000001837c7e58 CFRunLoopRunSpecific (CoreFoundation) 23 GraphicsServices 0x0000000185674f84 GSEventRunModal (GraphicsServices) 24 UIKit
0x000000018ce4767c UIApplicationMain (UIKit) 25 CallIn
0x0000000102c02c08 main (AppDelegate.swift:18) 26 libdyld.dylib
0x00000001832e456c start (libdyld.dylib)

Answer 1

复制

这是因为 Timeblock.startHour 和 Timeblock.endHour 被 Int 值弄乱了索引。查看我们的用户日历后，我注意到他们都有在午夜结束的会议。

因此对于在下午 5 点到午夜之间进行的会议，我们会发生以下情况。

for i in timeblock.startHour...timeblock.endHour 成为 for i in 0...17

这会给出一个非常精确的错误，告诉我一旦我重现了崩溃，我就不能向后迭代，不幸的是，崩溃报告中没有出现，这有点误导。

修复

我们已经限制了创建 timeblock.endHour 属性的时间，因此将第二天的 > 0:00 更改为 23:59 以防止出现这种情况。修复只是将上限应用于 >= 0:00，因此午夜结束的会议不会被视为 multi-day 会议。

未来的重构可能会将所有在该小时结束的时间设置为前一小时的结束时间，因为从技术上讲，如果您的会议在 11:00am 结束，您仍然有空闲时间。我还想在 Timeblock object 中处理这一切，而不是过滤用于创建它的参数。

如何确定我的 SIGTrap 崩溃的原因？

How to identify the cause of my SIGTrap Crash?

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