Question

这种奇怪的崩溃只发生在设备上，而在模拟器中正常工作。逐行调试，我注意到，当我将一个字符串值附加到双打数组时会发生这种情况。要做到这一点，我使用扩展转换双：

extension String {
func toDouble() -> Double? {
    return NSNumberFormatter().numberFromString(self)?.doubleValue
    }
}

崩溃的行是：

litros.append(temp_litros.toDouble()!) //litros is my array and temp_litros my string

错误：

fatal error: unexpectedly found nil while unwrapping an Optional value

我真的不明白为什么它在模拟器中有效，而且它不在设备上。

任何人都有想法可能会发生什么？提前谢谢！

崩溃报告：

Incident Identifier: 49F378A2-E7D9-4985-B208-99F529AE8813
CrashReporter Key:   fe58b29412047d4d8980b9cb66ae017f1c2db7d5
Hardware Model:      iPhone7,2
Process:             Nuvem [9479]
Path:                /private/var/mobile/Containers/Bundle/Application/8989627A-4064-428C-888B-C09F00A3EA0B/Nuvem.app/Nuvem
Identifier:          br.com.gimenez.Nuvem
Version:             1 (1.0)
Code Type:           ARM-64 (Native)
Parent Process:      launchd [1]

Date/Time:           2015-07-23 18:07:12.529 -0300
Launch Time:         2015-07-23 18:07:05.037 -0300
OS Version:          iOS 8.4 (12H143)
Report Version:      105

Exception Type:  EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x0000000100659474
Triggered by Thread:  0

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libswiftCore.dylib              0x0000000100659474 0x100598000 + 791668
1   Nuvem                           0x00000001000b5110 Nuvem.GraficoViewController.viewDidLoad (Nuvem.GraficoViewController)() -> () (GraficoViewController.swift:69)
2   Nuvem                           0x00000001000b5410 @objc Nuvem.GraficoViewController.viewDidLoad (Nuvem.GraficoViewController)() -> () (GraficoViewController.swift:0)
3   UIKit                           0x0000000188d14c14 -[UIViewController loadViewIfRequired] + 688
4   UIKit                           0x0000000188d14924 -[UIViewController view] + 28
5   UIKit                           0x0000000188eb71ec -[UINavigationController _startCustomTransition:] + 708
6   UIKit                           0x0000000188dc9e80 -[UINavigationController _startDeferredTransitionIfNeeded:] + 464
7   UIKit                           0x0000000188dc9c4c -[UINavigationController __viewWillLayoutSubviews] + 52
8   UIKit                           0x0000000188dc9bcc -[UILayoutContainerView layoutSubviews] + 196
9   UIKit                           0x0000000188d116f0 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 576
10  QuartzCore                      0x000000018864ddb4 -[CALayer layoutSublayers] + 148
11  QuartzCore                      0x000000018864881c CA::Layer::layout_if_needed(CA::Transaction*) + 316
12  QuartzCore                      0x00000001886486c0 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 28
13  QuartzCore                      0x0000000188647e54 CA::Context::commit_transaction(CA::Transaction*) + 272
14  QuartzCore                      0x0000000188647bd4 CA::Transaction::commit() + 524
15  QuartzCore                      0x00000001886412fc CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 76
16  CoreFoundation                  0x00000001842542a0 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 28
17  CoreFoundation                  0x000000018425122c __CFRunLoopDoObservers + 356
18  CoreFoundation                  0x000000018425160c __CFRunLoopRun + 832
19  CoreFoundation                  0x000000018417d2d0 CFRunLoopRunSpecific + 392
20  GraphicsServices                0x000000018dbd36f8 GSEventRunModal + 164
21  UIKit                           0x0000000188d7af3c UIApplicationMain + 1484
22  Nuvem                           0x00000001000ad9b8 main (AppDelegate.swift:14)
23  libdyld.dylib                   0x0000000196612a04 start + 0

Thread 1 name:  Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0   libsystem_kernel.dylib          0x0000000196710c24 kevent64 + 8
1   libdispatch.dylib               0x00000001965f5e6c _dispatch_mgr_invoke + 272
2   libdispatch.dylib               0x00000001965e7998 _dispatch_mgr_thread + 48

Thread 2:
0   libsystem_kernel.dylib          0x000000019672bc78 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x00000001967c52d8 _pthread_wqthread + 988
2   libsystem_pthread.dylib         0x00000001967c4eec start_wqthread + 0

Thread 3:
0   libsystem_kernel.dylib          0x000000019672bc78 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x00000001967c52d8 _pthread_wqthread + 988
2   libsystem_pthread.dylib         0x00000001967c4eec start_wqthread + 0

Thread 4:
0   libsystem_kernel.dylib          0x000000019672bc78 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x00000001967c52d8 _pthread_wqthread + 988
2   libsystem_pthread.dylib         0x00000001967c4eec start_wqthread + 0

Thread 5:
0   libsystem_kernel.dylib          0x000000019672bc78 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x00000001967c52d8 _pthread_wqthread + 988
2   libsystem_pthread.dylib         0x00000001967c4eec start_wqthread + 0

Thread 6 name:  com.apple.NSURLConnectionLoader
Thread 6:
0   libsystem_kernel.dylib          0x0000000196710e0c mach_msg_trap + 8
1   libsystem_kernel.dylib          0x0000000196710c84 mach_msg + 68
2   CoreFoundation                  0x0000000184253720 __CFRunLoopServiceMachPort + 196
3   CoreFoundation                  0x0000000184251674 __CFRunLoopRun + 936
4   CoreFoundation                  0x000000018417d2d0 CFRunLoopRunSpecific + 392
5   CFNetwork                       0x0000000183c5a590 +[NSURLConnection(Loader) _resourceLoadLoop:] + 436
6   Foundation                      0x000000018519ddb4 __NSThread__main__ + 1068
7   libsystem_pthread.dylib         0x00000001967c7dc4 _pthread_body + 160
8   libsystem_pthread.dylib         0x00000001967c7d20 _pthread_start + 156
9   libsystem_pthread.dylib         0x00000001967c4ef4 thread_start + 0

Thread 7 name:  com.apple.CFSocket.private
Thread 7:
0   libsystem_kernel.dylib          0x000000019672b498 __select + 8
1   CoreFoundation                  0x0000000184259124 __CFSocketManager + 668
2   libsystem_pthread.dylib         0x00000001967c7dc4 _pthread_body + 160
3   libsystem_pthread.dylib         0x00000001967c7d20 _pthread_start + 156
4   libsystem_pthread.dylib         0x00000001967c4ef4 thread_start + 0

Thread 8:
0   libsystem_kernel.dylib          0x000000019672bc78 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x00000001967c52d8 _pthread_wqthread + 988
2   libsystem_pthread.dylib         0x00000001967c4eec start_wqthread + 0

Thread 9:
0   libsystem_kernel.dylib          0x000000019672bc78 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x00000001967c52d8 _pthread_wqthread + 988
2   libsystem_pthread.dylib         0x00000001967c4eec start_wqthread + 0

Thread 10:
0   libsystem_kernel.dylib          0x000000019672bc78 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x00000001967c52d8 _pthread_wqthread + 988
2   libsystem_pthread.dylib         0x00000001967c4eec start_wqthread + 0

Thread 11:
0   libsystem_kernel.dylib          0x000000019672bc78 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x00000001967c52d8 _pthread_wqthread + 988
2   libsystem_pthread.dylib         0x00000001967c4eec start_wqthread + 0

Thread 12:
0   libsystem_kernel.dylib          0x0000000196710e0c mach_msg_trap + 8
1   libsystem_kernel.dylib          0x0000000196710c84 mach_msg + 68
2   CoreFoundation                  0x0000000184253720 __CFRunLoopServiceMachPort + 196
3   CoreFoundation                  0x0000000184251674 __CFRunLoopRun + 936
4   CoreFoundation                  0x000000018417d2d0 CFRunLoopRunSpecific + 392
5   Foundation                      0x00000001850b54c4 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 312
6   Foundation                      0x000000018510f80c -[NSRunLoop(NSRunLoop) run] + 92
7   Nuvem                           0x00000001000e64f8 +[PBAFURLConnectionOperation networkRequestThreadEntryPoint:] (PBAFURLConnectionOperation.m:151)
8   Foundation                      0x000000018519ddb4 __NSThread__main__ + 1068
9   libsystem_pthread.dylib         0x00000001967c7dc4 _pthread_body + 160
10  libsystem_pthread.dylib         0x00000001967c7d20 _pthread_start + 156
11  libsystem_pthread.dylib         0x00000001967c4ef4 thread_start + 0

Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x0000000100588b80   x1: 0x00000001742f6a00   x2: 0x0000000000000008   x3: 0x0000000196765a74
    x4: 0x000000016fd80e38   x5: 0x0000000000000020   x6: 0x0000000000000000   x7: 0x0000000000000fa0
    x8: 0x00000001742f6b80   x9: 0x0000000000000000  x10: 0x0000000100584800  x11: 0x00000000005d0bda
   x12: 0x00000000fffffff2  x13: 0x00000001887c5480  x14: 0x0000000000000053  x15: 0x000000000000004d
   x16: 0x00000001967bda50  x17: 0x0000000000000000  x18: 0x0000000000000000  x19: 0x0000000144d85300
   x20: 0x00000001978b7720  x21: 0x0000000000000008  x22: 0x0000000000000008  x23: 0x0000000000000000
   x24: 0x0000000000000006  x25: 0x000000000004ffff  x26: 0x0000000144e161d0  x27: 0x000000016fd810e9
   x28: 0x0000000144d85300  fp: 0x000000016fd80ed0   lr: 0x0000000100659474
    sp: 0x000000016fd80ec0   pc: 0x0000000100659474 cpsr: 0x60000000

Answer 1

默认情况下，NSNumberFormatter会根据当前的区域设置转换数据。在模拟器的情况下，它使用美国语言环境和＆＃34;。＆＃34;作为小数分隔符。如果您的设备使用＆＃34;，＆＃34;作为分隔符，因此它无法转换您的数据，numberFromString将返回nil。

试试这个：

extension String {
    func toDouble() -> Double? {
        let formatter = NSNumberFormatter()
        formatter.locale = NSLocale(localeIdentifier: "en_US")
        return formatter.numberFromString(self)?.doubleValue
    }
}

应用仅在设备

1 个答案: