This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release.

[dddppp]

Hello,

I am running the iOS Charts library extensively on an App and I get the following message:

"This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release.
Stack:(
0 CoreFoundation 0x0000000182884f74 + 148
1 libobjc.A.dylib 0x000000019747bf80 objc_exception_throw + 56
2 CoreFoundation 0x0000000182884ea4 + 0
3 Foundation 0x000000018389e5d8 + 88
4 Foundation 0x0000000183720a1c + 36
5 UIKit 0x0000000187edf93c + 64
6 UIKit 0x00000001886060ac + 156
7 UIKit 0x0000000188605da0 + 252
8 UIKit 0x00000001886060d8 + 200
9 UIKit 0x0000000187ee0820 + 100
10 UIKit 0x0000000187edf94c + 80
11 UIKit 0x0000000187ee0454 + 244
12 UIKit 0x000000018860677c + 268
13 UIKit 0x00000001880ddfb0 + 176
14 UIKit 0x0000000187dd701c + 688
15 QuartzCore 0x00000001875ddf14 + 148
16 QuartzCore 0x00000001875d8b20 + 292
17 QuartzCore 0x00000001875d89e0 + 32
18 QuartzCore 0x00000001875d807c + 252
19 QuartzCore 0x00000001875d7dd0 + 516
20 QuartzCore 0x0000000187606f48 + 236
21 libsystem_pthread.dylib 0x0000000197e8a1e8 + 584
22 libsystem_pthread.dylib 0x0000000197e89d60 + 136
23 libsystem_pthread.dylib 0x0000000197e89544 pthread_mutex_lock + 0
24 libsystem_pthread.dylib 0x0000000197e89028 start_wqthread + 4
)"

I have zombie objects enabled as well as an "All Exceptions" breakpoint, no sign that is from my code so I assume is from iOS Charts.

To fix this we need to modify the iso-charts library so it modifies the UI elements using dispatch on the main queue, see here:

http://stackoverflow.com/questions/28302019/getting-a-this-application-is-modifying-the-autolayout-engine-error

[pmairoldi]

You application is doing something not on the main thread. As far as I know there is no autolayout code in this library.

[liuxuan30]

@petester42 +1, it's your code problem, not this library

If you think so, give the symbol-ed stack trace, not this wild address trace, so we have better ideas and reopen this issue

[bocalexandru]

I receive the same error, only here it references the Charts:

This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release.
Stack:(
0 CoreFoundation 0x0000000182252dc8 + 148
1 libobjc.A.dylib 0x00000001818b7f80 objc_exception_throw + 56
2 CoreFoundation 0x0000000182252cf8 + 0
3 Foundation 0x0000000182d03b2c + 88
4 Foundation 0x0000000182b84c3c + 36
5 UIKit 0x00000001873a2bc4 + 532
6 UIKit 0x00000001873b0678 + 1784
7 Charts 0x0000000100bbaff8 TFC6Charts26ChartXAxisRendererBarChart10drawLabelsfT7contextCSo9CGContext3posV12CoreGraphics7CGFloat6anchorVSC7CGPoint_T + 8104
8 Charts 0x0000000100baf8fc TFC6Charts18ChartXAxisRenderer16renderAxisLabelsfT7contextCSo9CGContext_T + 1720
9 Charts 0x0000000100b09ac8 TFC6Charts20BarLineChartViewBase8drawRectfVSC6CGRectT + 9548
10 Charts 0x0000000100b09fb8 TToFC6Charts20BarLineChartViewBase8drawRectfVSC6CGRectT + 120
11 UIKit 0x0000000187432678 + 368
12 QuartzCore 0x0000000184d66228 + 260
13 QuartzCore 0x0000000184d508ac + 2432
14 QuartzCore 0x0000000184e68360 + 52
15 QuartzCore 0x0000000184d4fa88 + 1368
16 QuartzCore 0x0000000184d317a8 + 228
17 QuartzCore 0x0000000184d31494 + 44
18 QuartzCore 0x0000000184d30ab8 + 252
19 QuartzCore 0x0000000184d30818 + 500
20 QuartzCore 0x0000000184d5fbcc + 236
21 libsystem_pthread.dylib 0x0000000181eb61e0 + 584
22 libsystem_pthread.dylib 0x0000000181eb5d58 + 136
23 libsystem_pthread.dylib 0x0000000181eb553c pthread_mutex_lock + 0
24 libsystem_pthread.dylib 0x0000000181eb5020 start_wqthread + 4
)

I have checked and double checked all the calls to the library to not call from any other thread thah the main one!

[pmairoldi]

Our library contains no auto layout code. The problem is on your end. You are probably modifying the constraints of the view that contains the chart.