IOS 应用程序崩溃，xcode 在调试时显示“与 X 的 iPhone 失去连接”

我的应用程序崩溃了，我需要一些建议来找到并修复这个问题。这不是一个设备或电缆问题，因为它发生在所有设备上，而不仅仅是在调试时。Xcode 不会在异常断点停止，应用程序只是简单地停止运行，没有错误信息。调试 xcode 时只说“与 X 的 iPhone 失去连接”。我有以下设备的日志，请参阅 MY _ CRASHING _ APP:

Incident Identifier: 85730E97-BA21-4C72-8AD1-02075A8FD9A7
CrashReporter Key:   d9e9eb14ac1801fea11e662a394244d7caf29154
Hardware Model:      iPhone4,1
OS Version:          iPhone OS 8.0 (12A365)
Kernel Version:      Darwin Kernel Version 14.0.0: Tue Aug 19 15:08:02 PDT 2014; root:xnu-2783.1.72~8/RELEASE_ARM_S5L8940X
Date:                2014-09-24 15:02:41 +0200
Time since snapshot: 325 ms


Free pages:                              20793
Active pages:                            20412
Inactive pages:                          10678
Speculative pages:                       1757
Throttled pages:                         55906
Purgeable pages:                         699
Wired pages:                             21196
File-backed pages:                       30263
Anonymous pages:                         2584
Compressions:                            76385
Decompressions:                          3948
Compressor Size:                         81
Uncompressed Pages in Compressor:        61
Page Size:                               4096
Largest process:   MY_CRASHING_APP


Processes
Name       |            <UUID>                |     CPU Time|     rpages|       purgeable| recent_max| lifetime_max| fds |  [reason]         | (state)


coreduetd <675ac3d39b193f9bba42896818431859>         0.049         124                0           -           391   50     [vnode-limit]     (daemon) (idle)
homed <77bcbc47e2723e269b0ff9d115658259>         0.052         146                0           -           458   50     [vnode-limit]     (daemon) (idle)
gamed <a51b1ad16b693a75aeaaf2166e7b1b0b>         0.049          38                0           -            74   50     [vnode-limit]     (daemon) (idle)
lsd <72b4494834d3357bb8aa32fd5b5c8e83>         0.068         161                0           -           368   50     [vnode-limit]     (daemon)
InCallService <88e149874b1c35f2b8adbeee958d7258>        18.461        1289                0           -          3238   50     [vnode-limit]     (resume) (continuous)
MY_CRASHING_APP <1542054cd5393df29827ca1a6bd34e04>        59.116       24504              600           -         29490 1600     [vnode-limit]     (frontmost) (resume)
ptpd <c0bc1e573edb3bcebea0f3140a139421>         3.442         878                0           -          1634   50                       (daemon)
BTServer <1b7372b3ae393847b1c3ccaa720e991e>         3.057         393                0           -          1437   50                       (daemon)
lockdownd <bb602fb4b5ac3b51af2d22c4fdce9778>        11.306         271                0           -           761   50                       (daemon)
imagent <01ebc2c08d7f36059714967efaa86e78>        19.892         585                0           -          1286   50                       (daemon)
locationd <9727e24fbe4f357cb27d7bc8cf882c93>       489.694        1665                0           -          3586   50                       (daemon)
identityservices <13c2b979d6433252a011087be05e1aa5>        22.999         696                0          +2          1585   50                       (daemon)
discoveryd <dff5d0d2edf43b45b0c7fbd4a3e1b677>        93.758         589                0           -          1077  100                       (daemon)
wifid <5fb79228aa653a9bb725217b9cb891e6>        63.420         571                0           -          1098   50                       (daemon)
iaptransportd <ae70565455de38f3aab8993e9d109207>         7.713         306                0           -           579   50                       (daemon)
mediaserverd <b5ba58774a853d43a17559ae76a6f918>       649.476        1025               64           -          6134   50                       (daemon)
syslogd <a5a138dc01cd34d19bbe336c03099ce7>        40.100         201                0           -           384   50                       (daemon)
powerd <b3163caaebd53f7aa42634836472ea04>        43.199         231                0           -           474   50                       (daemon)
apsd <17af2320ccfb3e668b6455b95b4612ce>        37.461         631                0           -          1445   50                       (daemon)
networkd <a657abe0ce803333b886876a8f7a36e0>        77.271         596                0           -          1297   50                       (daemon)
dataaccessd <db655c44d5c830dc9e5f34f7edcb17a4>       243.259        1777                0           -          3097  100                       (daemon)
vmd <88cebb23d0f1344db23e1896b1787f2d>         0.505         204                0           -           617   50                       (daemon)
iapd <e84bb9b7cf7530babc36c6ca37b7f345>        11.963         453                0           -          1673   50                       (daemon)
syslog_relay <9e18dbcbcc07374e9d14c732b8dabad2>         1.424          98                0           -           189   50                       (daemon)
voiced <2d24fa3e32533f2f8298743eaf348d63>         0.179         210                0           -           581   50                       (daemon)
itunesstored <d50d5b1c3f693694a2eee878aae8facf>         0.573         908                0           -          1759   50                       (daemon)
SpringBoard <3e0aacaca7103aa09a71e5c9fee3e012>       841.081        7088               29           -         16912   50
backboardd <117d65aca8ce3ba68c7fd87d9ab81da6>      3424.058        6678              625           -          4409   50                       (daemon)
UserEventAgent <2f6c74a697943aed899faebac621e4c3>       316.816         848                0           -          2101  200                       (daemon)
configd <64e4db8bced23463b446c4b7c868fcfa>        31.906         416                0           -           933   50                       (daemon)
fseventsd <a393d343a7533860b5c1eddb922a33f1>        20.088         405                0           -           805   50                       (daemon)
fairplayd.H1 <c3856f0573fb3f9887721a239507f28b>        30.647         159                0           -          1096   50                       (daemon)
assertiond <032107d4db2b36ddac986060d8c62f73>        26.282         289                0           -           702   50                       (daemon)
wirelessproxd <ba82fe3b38f63f2b8b8807a2bf97aadd>         1.071         179                0           -           643   50                       (daemon)
distnoted <e8f9e76e751838a880dad2d4a953f814>         4.457         193                0           -           254   50                       (daemon)
discoveryd_helpe <84abc0c6dd5b37a8b2c8323881e16da7>         0.493         123                0           -           466   50                       (daemon)
ubd <5f4f0054821e3b41b543a4d9f4176291>         9.040         730                0           -          1540   50                       (daemon)
filecoordination <68a3848887853629adae42f5828a5443>         2.731         251                0           -           649  100                       (daemon)
aggregated <ab0d307a392f36cc827709d24c4b8696>      1335.558        1081                0           -          1688   50                       (daemon)
DTMobileIS <086152f142ac30a686a172b148d38fbc>       109.156         474                0           -          1724   50                       (daemon)
touchsetupd <d8aabe65f2d23f6ab7704bbccc6c2ba1>         0.388         158                0           -           464   50                       (daemon)
cfprefsd <6e5dcfe209183c719091d07edad590da>         0.150         166                0           -           320   50                       (daemon)
accountsd <9eb0309b021033c6b24ce65da48fa228>         0.665         595                0           -          1909   50                       (daemon)
CommCenter <0e1ced0eddce346ba27e9f54886ef025>       669.306        1543                0           -          4623   50                       (daemon)
notifyd <7beaf472572334d4989a40473776f635>        61.698         272                0           -           309   50                       (daemon)
ReportCrash <b36d5780860a3dfcbb146b2cc6bca339>         0.062         146                0           -           443   50                       (daemon)


**End**

更新:

结果是记忆问题。应用程序很快分配了大量的内存，操作系统终止了应用程序。奇怪的是，Xcode 没有记录内存警告，而 Instruments 显示应用程序收到了大量警告。其他使用相同内存量的应用程序没有出现内存警告。我的猜测是，这些分配内存的速度并不是如此之快。

这个应用程序运行在 iPhone4S 上，在大约90MB 的内存使用量时被关闭。

令我困惑的是其他失去记忆的问题都有 Purgeable pages: 0。所以我猜这不是内存不足，而是短时间内内存使用过多？

29885

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Yes, it is a memory issue, or you have opened too many threads. I have met this problem before. The problem I met like this:

When I delete a photo, which may cost about 0.2s, I would like to show a toast(MBProgressHUD) to user, and GCD to hide the toast after deleting.
When I tried to delete 100 photos, it is okay. However, when I tried to delete 200 photos, the app might be crashed. When I tried to delete 300 photos, the iPhone always restart itself.

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I had this same issue when loading a bunch of very large images (5000px x 5000px) in UIImages. Luckily the images were not supposed to be anywhere near that big and I just needed to resize them.

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As Andy Darwin suggested, it is a memory issue.

I had this problem on older devices when adding an UIImageView with animationImages.

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In my case, I use UICollectionView to show a bunch of photos and when I want to perform reloadData to the view, crash occurs, while the memory usage is not that high (less than 100M). Besides memory issue, I think reloadData of UICollectionView or UITableView may cause this, too.

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Posting for posterity, as I recently experienced this 'crash' and it wasn't due to memory issues as others have suggested:

In rare cases, this can be an issue with the cord used to connect the iPhone to the computer. I had a faulty lightning cable, that would sporadically lose connection to my mac. The solution was to by a new one!

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Just to add that I had the same issue running my app both on and old Ipad 3 and Iphone 6. What ended up being the problem was I had accidentally saved 2 images of the project as a 40mb and a 20mb version. So it was a memory issue. I downsized them as 1mb each, and issue solved.

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Just chipping in for anyone else who is struggling on this one.

For me the solution was to restart my device.

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This bug appears frequently since I switched on iOS 11 Beta. Sometimes restarting the device works, sometimes my computer...

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Using Big Sour with XCode 12.2

Create a file called .lldbinit on your home directory (~)
Add this line to the file: settings set plugin.process.gdb-remote.packet-timeout 300
Restart Xcode and try again