一直可靠工作的时间戳功能只是导致 EXC_BAD_INST

问题描述

我一直在使用这个函数来生成时间戳.我在 Stack Overflow 上的某个地方找到了它.

I have been using this function to generate a time stamp. I found it somewhere here on Stack Overflow.

@objc public class var timestamp: String {
    return "(Int(NSDate().timeIntervalSince1970 * 1000))"
}

它一直在正常工作，但我刚刚收到一个 EXC_BAD_INSTRUCTION:

It has been working without issue, but I just got a EXC_BAD_INSTRUCTION:

fatal error: floating point value cannot be converted to Int because it is greater than Int.max

随着这个应用程序的开发接近完成，突然间看到它导致 EXC_BAD_INSTRUCTION 让我感到紧张.这是在模拟器中运行的，但我设置了有效的日期和时间.

As the development of this app is nearing completion it makes me nervous to all of the sudden see it cause a EXC_BAD_INSTRUCTION. This is running in the Simulator, but I have a valid date and time set.

任何想法或建议或非常感谢.下面是回溯.

Any ideas or suggestions or are greatly appreciated. Below is the backtrace.

(lldb) bt
* thread #1: tid = 0x15c4d, 0x04a30393 libswiftCore.dylib`function signature specialization <Arg[0] = Exploded, Arg[1] = Exploded, Arg[2] = Dead, Arg[3] = Dead> of Swift._fatalErrorMessage (Swift.StaticString, Swift.StaticString, Swift.StaticString, Swift.UInt) -> () + 67, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
frame #0: 0x04a30393 libswiftCore.dylib function signature specialization <Arg[0] = Exploded, Arg[1] = Exploded, Arg[2] = Dead, Arg[3] = Dead> of Swift._fatalErrorMessage (Swift.StaticString, Swift.StaticString, Swift.StaticString, Swift.UInt) -> () + 67
* frame #1: 0x00afe0c9 TDTPhotoLib static     
TDTDeviceUtilites.timestamp.getter(self=TDTPhotoLib.TDTDeviceUtilites) + 409 at TDTDeviceUtilites.swift:127
frame #2: 0x00166979 Oilist TDTPaintingViewController.finshedSession(sender=0x7aee0fb0, self=0x7e9d3800) -> () + 169 at TDTPaintingViewController.swift:1370
frame #3: 0x00102896 Oilist TDTOilistMenuPainting.goForward(sender=0x7aee0fb0, self=0x7c218770) -> () + 374 at TDTOilistMenuPainting.swift:149
frame #4: 0x0010290d Oilist @objc TDTOilistMenuPainting.goForward(UIButton!) -> () + 61 at TDTOilistMenuPainting.swift:0
frame #5: 0x018a80b5 libobjc.A.dylib -[NSObject performSelector:withObject:withObject:] + 84
frame #6: 0x0336ee38 UIKit -[UIApplication sendAction:to:from:forEvent:] + 118
frame #7: 0x0336edb7 UIKit -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 64
frame #8: 0x03512f3b UIKit -[UIControl sendAction:to:forEvent:] + 79
frame #9: 0x035132d4 UIKit -[UIControl _sendActionsForEvents:withEvent:] + 433
frame #10: 0x035122c1 UIKit -[UIControl touchesEnded:withEvent:] + 714
frame #11: 0x033ef52e UIKit -[UIWindow _sendTouchesForEvent:] + 1095
frame #12: 0x033f05cc UIKit -[UIWindow sendEvent:] + 1159
frame #13: 0x03391be8 UIKit -[UIApplication sendEvent:] + 266
frame #14: 0x03366769 UIKit _UIApplicationHandleEventQueue + 7795
frame #15: 0x02423e5f CoreFoundation __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
frame #16: 0x02419aeb CoreFoundation __CFRunLoopDoSources0 + 523
frame #17: 0x02418f08 CoreFoundation __CFRunLoopRun + 1032
frame #18: 0x02418846 CoreFoundation CFRunLoopRunSpecific + 470
frame #19: 0x0241865b CoreFoundation CFRunLoopRunInMode + 123
frame #20: 0x07031664 GraphicsServices GSEventRunModal + 192
frame #21: 0x070314a1 GraphicsServices GSEventRun + 104
frame #22: 0x0336ceb9 UIKit UIApplicationMain + 160
frame #23: 0x00131ed1 Oilist main + 145 at AppDelegate.swift:14
frame #24: 0x05631a25 libdyld.dylib start + 1

推荐答案

你的代码会在所有 32 位平台(如 iPhone 4、5)上崩溃因为

Your code will crash on all 32-bit platforms (such as iPhone 4, 5) because the result of

NSDate().timeIntervalSince1970 * 1000
// E.g.: 1464850525047.38

不适合 32 位整数.作为解决方案，使用 64 位整数:

does not fit into a 32-bit integer. As a solution, use 64-bit integers:

Int64(NSDate().timeIntervalSince1970 * 1000)

或者，如果打算创建一个 string 表示毫秒，使用字符串格式而不是整数转换:

Alternatively, if the intention is to create a string representing the milliseconds, use string formatting instead of an integer conversion:

String(format:"%.0f", NSDate().timeIntervalSince1970 * 1000)

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