[英]Why does my app run in the simulator but crash trying to launch on my iPhone?
我正在使用Xcode 8.3.2在Swift 3中编写一个应用程序。 我的应用在模拟器中运行良好,但是当我尝试在iPhone(iOS 10.3.1)上运行该应用时,出现了一条难看的错误消息:
libswiftCore.dylib`function signature specialization <preserving fragile attribute, Arg[2] = Dead, Arg[3] = Dead> of Swift._fatalErrorMessage (Swift.StaticString, Swift.StaticString, file : Swift.StaticString, line : Swift.UInt, flags : Swift.UInt32) -> Swift.Never:
0x1005203d0 <+0>: stp x26, x25, [sp, #-0x50]!
0x1005203d4 <+4>: stp x24, x23, [sp, #0x10]
0x1005203d8 <+8>: stp x22, x21, [sp, #0x20]
0x1005203dc <+12>: stp x20, x19, [sp, #0x30]
0x1005203e0 <+16>: stp x29, x30, [sp, #0x40]
0x1005203e4 <+20>: add x29, sp, #0x40 ; =0x40
0x1005203e8 <+24>: mov x19, x6
0x1005203ec <+28>: mov x20, x5
0x1005203f0 <+32>: mov x21, x4
0x1005203f4 <+36>: mov x22, x3
0x1005203f8 <+40>: mov x23, x2
0x1005203fc <+44>: mov x24, x1
0x100520400 <+48>: mov x25, x0
0x100520404 <+52>: adr x8, #0xf11fc ; protocol descriptor for Swift._DefaultCustomPlaygroundQuickLookable + 136
0x100520408 <+56>: nop
0x10052040c <+60>: add x0, x8, #0x10 ; =0x10
0x100520410 <+64>: mov w1, #0x28
0x100520414 <+68>: orr w2, wzr, #0x7
0x100520418 <+72>: bl 0x100520750 ; swift_rt_swift_allocObject
0x10052041c <+76>: mov x8, x0
0x100520420 <+80>: stp x22, x21, [x8, #0x10]
0x100520424 <+84>: strb w20, [x8, #0x20]
0x100520428 <+88>: str w19, [x8, #0x24]
0x10052042c <+92>: adr x3, #0x40440 ; partial apply forwarder for Swift.(_fatalErrorMessage (Swift.StaticString, Swift.StaticString, file : Swift.StaticString, line : Swift.UInt, flags : Swift.UInt32) -> Swift.Never).(closure #2)
0x100520430 <+96>: nop
0x100520434 <+100>: mov x0, x25
0x100520438 <+104>: mov x1, x24
0x10052043c <+108>: mov x2, x23
0x100520440 <+112>: mov x4, x8
0x100520444 <+116>: bl 0x1004014dc ; function signature specialization <preserving fragile attribute, Arg[1] = [Closure Propagated : reabstraction thunk helper from @callee_owned (@unowned Swift.UnsafeBufferPointer<Swift.UInt8>) -> () to @callee_owned (@unowned Swift.UnsafeBufferPointer<Swift.UInt8>) -> (@out ()), Argument Types : [@callee_owned (@unowned Swift.UnsafeBufferPointer<Swift.UInt8>) -> ()]> of generic specialization <preserving fragile attribute, ()> of Swift.StaticString.withUTF8Buffer <A> ((Swift.UnsafeBufferPointer<Swift.UInt8>) -> A) -> A
-> 0x100520448 <+120>: brk #0x1
我设置了一个异常断点,导致我看到以下代码:
if let defaultFormula = dataManager.fetchDefaultFormula(moc) {
self.formula = defaultFormula.first! <<< Unexpectedly found nil...
}
这是它正在调用的函数:
func fetchDefaultFormula(_ moc: NSManagedObjectContext) -> [Formula]? {
let defaultFormulaID = UserDefaults.formula()
let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Formula")
let filterPredicate = NSPredicate(format: "uuid = [c] %@", defaultFormulaID)
fetchRequest.predicate = filterPredicate
do {
return try moc.fetch(fetchRequest) as? [Formula]
} catch {
fatalError("There was an error fetching the lifts")
}
return nil
}
提取请求返回0值,因此很清楚为什么在强制打开包装时会得到异常。 但是,对象属性“公式”必须具有一个值。 应用程序要做的第一件事是检查持久性存储中是否存在默认数据(如可用的公式),如果不存在,则将其添加。 我已经重置了模拟器,并忠实地添加了它们,但是看来这在iPhone上没有发生。 如果可以在iPhone上运行时确定是否将记录添加到商店中,请给我启发。
我发现了一些SO线程,其他线程在其中遇到了这种神秘的错误(一个大而丑陋的错误,而不是意外的nil),并且我尝试了所有建议的补救措施:
我已经筋疲力尽了,我不知道从这里到哪里都可以找到。
任何建议,不胜感激。
好吧,我想我没有尝试过的一件事-首先从手机上卸载应用程序,然后在手机上构建并运行它。
所以我真的不知道根本原因是什么,但是至少这可以解决问题。
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