[iOS开发]使用GCD遇到的问题
2015-11-19 17:28
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最近在使用GCD遇到这样的问题，刚开始不是很明白，不能使用后台线程来修改autolayout引擎？后来查了一下问题，在iOS9 - This application is modifying the autolayout engine from a background thread — where?这里找到了答案，想起之前看过一篇文章详细论述GCD的提到修改UI的操作应该放在主线程中，因为iOS的设计就是用主线程来加载渲染界面的，因此恍然大悟，感觉实践才能检验真理呀！
2015-11-19 17:14:25.825 VRPVisual[8917:2969207] 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 0x0000000183578f60 <redacted> + 148 1 libobjc.A.dylib 0x00000001980c7f80 objc_exception_throw + 56 2 CoreFoundation 0x0000000183578e90 <redacted> + 0 3 Foundation 0x00000001845972d8 <redacted> + 88 4 Foundation 0x00000001844194fc <redacted> + 36 5 UIKit 0x000000018936f108 <redacted> + 884 6 UIKit 0x000000018937057c <redacted> + 788 7 UIKit 0x000000018943f740 <redacted> + 480 8 UIKit 0x000000018943c708 <redacted> + 172 9 UIKit 0x000000018943c978 <redacted> + 96 10 UIKit 0x000000018943ce3c <redacted> + 80 11 UIKit 0x00000001894413d0 <redacted> + 492 12 UIKit 0x000000018944053c <redacted> + 148 13 UIKit 0x000000018944047c <redacted> + 284 14 UIKit 0x0000000188f70d40 <redacted> + 444 15 UIKit 0x0000000188f70e14 <redacted> + 60 16 UIKit 0x0000000188f70f54 <redacted> + 28 17 UIKit 0x0000000188f70504 <redacted> + 100 18 UIKit 0x0000000188b0c098 <redacted> + 996 19 UIKit 0x0000000188b0bc9c <redacted> + 28 20 UIKit 0x0000000188e8b184 <redacted> + 108 21 UIKit 0x0000000188e842d4 <redacted> + 1328 22 UIKit 0x0000000188e85d94 <redacted> + 4644 23 UIKit 0x0000000188e88800 <redacted> + 472 24 UIKit 0x0000000188c05ea0 <redacted> + 184 25 UIKit 0x000000018942e880 <redacted> + 512 26 UIKit 0x000000018942ce34 <redacted> + 228 27 UIKit 0x0000000188f8081c <redacted> + 260 28 VRPVisual 0x000000010002c704 __48-[ExportViewController requestToExportInstance:]_block_invoke176 + 2760 29 VRPVisual 0x0000000100029a94 __86-[BMKRouteSearch(BatchRouteSearch) drivingRouteMatrixSearch:successBlock:failedBlock:]_block_invoke_3 + 592 30 libdispatch.dylib 0x00000001007a9ca8 _dispatch_call_block_and_release + 24 31 libdispatch.dylib 0x00000001007a9c68 _dispatch_client_callout + 16 32 libdispatch.dylib 0x00000001007b8ec8 _dispatch_root_queue_drain + 2344 33 libdispatch.dylib 0x00000001007b8590 _dispatch_worker_thread3 + 132 34 libsystem_pthread.dylib 0x0000000198af9470 _pthread_wqthread + 1092 35 libsystem_pthread.dylib 0x0000000198af9020 start_wqthread + 4 ) 2015-11-19 17:14:25.841 VRPVisual[8917:2969207] 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 0x0000000183578f60 <redacted> + 148 1 libobjc.A.dylib 0x00000001980c7f80 objc_exception_throw + 56 2 CoreFoundation 0x0000000183578e90 <redacted> + 0 3 Foundation 0x00000001845972d8 <redacted> + 88 4 Foundation 0x000000018441da1c <redacted> + 56 5 Foundation 0x00000001844195dc <redacted> + 260 6 UIKit 0x000000018936f108 <redacted> + 884 7 UIKit 0x000000018937057c <redacted> + 788 8 UIKit 0x000000018943f740 <redacted> + 480 9 UIKit 0x000000018943c708 <redacted> + 172 10 UIKit 0x000000018943c978 <redacted> + 96 11 UIKit 0x000000018943ce3c <redacted> + 80 12 UIKit 0x00000001894413d0 <redacted> + 492 13 UIKit 0x000000018944053c <redacted> + 148 14 UIKit 0x000000018944047c <redacted> + 284 15 UIKit 0x0000000188f70d40 <redacted> + 444 16 UIKit 0x0000000188f70e14 <redacted> + 60 17 UIKit 0x0000000188f70f54 <redacted> + 28 18 UIKit 0x0000000188f70504 <redacted> + 100 19 UIKit 0x0000000188b0c098 <redacted> + 996 20 UIKit 0x0000000188b0bc9c <redacted> + 28 21 UIKit 0x0000000188e8b184 <redacted> + 108 22 UIKit 0x0000000188e842d4 <redacted> + 1328 23 UIKit 0x0000000188e85d94 <redacted> + 4644 24 UIKit 0x0000000188e88800 <redacted> + 472 25 UIKit 0x0000000188c05ea0 <redacted> + 184 26 UIKit 0x000000018942e880 <redacted> + 512 27 UIKit 0x000000018942ce34 <redacted> + 228 28 UIKit 0x0000000188f8081c <redacted> + 260 29 VRPVisual 0x000000010002c704 __48-[ExportViewController requestToExportInstance:]_block_invoke176 + 2760 30 VRPVisual 0x0000000100029a94 __86-[BMKRouteSearch(BatchRouteSearch) drivingRouteMatrixSearch:successBlock:failedBlock:]_block_invoke_3 + 592 31 libdispatch.dylib 0x00000001007a9ca8 _dispatch_call_block_and_release + 24 32 libdispatch.dylib 0x00000001007a9c68 _dispatch_client_callout + 16 33 libdispatch.dylib 0x00000001007b8ec8 _dispatch_root_queue_drain + 2344 34 libdispatch.dylib 0x00000001007b8590 _dispatch_worker_thread3 + 132 35 libsystem_pthread.dylib 0x0000000198af9470 _pthread_wqthread + 1092 36 libsystem_pthread.dylib 0x0000000198af9020 start_wqthread + 4 ) 2015-11-19 17:14:25.853 VRPVisual[8917:2969207] 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 0x0000000183578f60 <redacted> + 148 1 libobjc.A.dylib 0x00000001980c7f80 objc_exception_throw + 56 2 CoreFoundation 0x0000000183578e90 <redacted> + 0 3 Foundation 0x00000001845972d8 <redacted> + 88 4 Foundation 0x00000001844194fc <redacted> + 36 5 UIKit 0x000000018936f158 <redacted> + 964 6 UIKit 0x000000018937057c <redacted> + 788 7 UIKit 0x000000018943f740 <redacted> + 480 8 UIKit 0x000000018943c708 <redacted> + 172 9 UIKit 0x000000018943c978 <redacted> + 96 10 UIKit 0x000000018943ce3c <redacted> + 80 11 UIKit 0x00000001894413d0 <redacted> + 492 12 UIKit 0x000000018944053c <redacted> + 148 13 UIKit 0x000000018944047c <redacted> + 284 14 UIKit 0x0000000188f70d40 <redacted> + 444 15 UIKit 0x0000000188f70e14 <redacted> + 60 16 UIKit 0x0000000188f70f54 <redacted> + 28 17 UIKit 0x0000000188f70504 <redacted> + 100 18 UIKit 0x0000000188b0c098 <redacted> + 996 19 UIKit 0x0000000188b0bc9c <redacted> + 28 20 UIKit 0x0000000188e8b184 <redacted> + 108 21 UIKit 0x0000000188e842d4 <redacted> + 1328 22 UIKit 0x0000000188e85d94 <redacted> + 4644 23 UIKit 0x0000000188e88800 <redacted> + 472 24 UIKit 0x0000000188c05ea0 <redacted> + 184 25 UIKit 0x000000018942e880 <redacted> + 512 26 UIKit 0x000000018942ce34 <redacted> + 228 27 UIKit 0x0000000188f8081c <redacted> + 260 28 VRPVisual 0x000000010002c704 __48-[ExportViewController requestToExportInstance:]_block_invoke176 + 2760 29 VRPVisual 0x0000000100029a94 __86-[BMKRouteSearch(BatchRouteSearch) drivingRouteMatrixSearch:successBlock:failedBlock:]_block_invoke_3 + 592 30 libdispatch.dylib 0x00000001007a9ca8 _dispatch_call_block_and_release + 24 31 libdispatch.dylib 0x00000001007a9c68 _dispatch_client_callout + 16 32 libdispatch.dylib 0x00000001007b8ec8 _dispatch_root_queue_drain + 2344 33 libdispatch.dylib 0x00000001007b8590 _dispatch_worker_thread3 + 132 34 libsystem_pthread.dylib 0x0000000198af9470 _pthread_wqthread + 1092 35 libsystem_pthread.dylib 0x0000000198af9020 start_wqthread + 4 ) 2015-11-19 17:14:25.863 VRPVisual[8917:2969207] 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 0x0000000183578f60 <redacted> + 148 1 libobjc.A.dylib 0x00000001980c7f80 objc_exception_throw + 56 2 CoreFoundation 0x0000000183578e90 <redacted> + 0 3 Foundation 0x00000001845972d8 <redacted> + 88 4 Foundation 0x000000018441da1c <redacted> + 56 5 Foundation 0x00000001844195dc <redacted> + 260 6 UIKit 0x000000018936f158 <redacted> + 964 7 UIKit 0x000000018937057c <redacted> + 788 8 UIKit 0x000000018943f740 <redacted> + 480 9 UIKit 0x000000018943c708 <redacted> + 172 10 UIKit 0x000000018943c978 <redacted> + 96 11 UIKit 0x000000018943ce3c <redacted> + 80 12 UIKit 0x00000001894413d0 <redacted> + 492 13 UIKit 0x000000018944053c <redacted> + 148 14 UIKit 0x000000018944047c <redacted> + 284 15 UIKit 0x0000000188f70d40 <redacted> + 444 16 UIKit 0x0000000188f70e14 <redacted> + 60 17 UIKit 0x0000000188f70f54 <redacted> + 28 18 UIKit 0x0000000188f70504 <redacted> + 100 19 UIKit 0x0000000188b0c098 <redacted> + 996 20 UIKit 0x0000000188b0bc9c <redacted> + 28 21 UIKit 0x0000000188e8b184 <redacted> + 108 22 UIKit 0x0000000188e842d4 <redacted> + 1328 23 UIKit 0x0000000188e85d94 <redacted> + 4644 24 UIKit 0x0000000188e88800 <redacted> + 472 25 UIKit 0x0000000188c05ea0 <redacted> + 184 26 UIKit 0x000000018942e880 <redacted> + 512 27 UIKit 0x000000018942ce34 <redacted> + 228 28 UIKit 0x0000000188f8081c <redacted> + 260 29 VRPVisual 0x000000010002c704 __48-[ExportViewController requestToExportInstance:]_block_invoke176 + 2760 30 VRPVisual 0x0000000100029a94 __86-[BMKRouteSearch(BatchRouteSearch) drivingRouteMatrixSearch:successBlock:failedBlock:]_block_invoke_3 + 592 31 libdispatch.dylib 0x00000001007a9ca8 _dispatch_call_block_and_release + 24 32 libdispatch.dylib 0x00000001007a9c68 _dispatch_client_callout + 16 33 libdispatch.dylib 0x00000001007b8ec8 _dispatch_root_queue_drain + 2344 34 libdispatch.dylib 0x00000001007b8590 _dispatch_worker_thread3 + 132 35 libsystem_pthread.dylib 0x0000000198af9470 _pthread_wqthread + 1092 36 libsystem_pthread.dylib 0x0000000198af9020 start_wqthread + 4 ) 2015-11-19 17:14:25.986 VRPVisual[8917:2969022] <CATransformLayer: 0x13e113b70> - changing property masksToBounds in transform-only layer, will have no effect 2015-11-19 17:14:25.987 VRPVisual[8917:2969022] <CATransformLayer: 0x13ea49a80> - changing property masksToBounds in transform-only layer, will have no effect 2015-11-19 17:14:25.988 VRPVisual[8917:2969022] <CATransformLayer: 0x13ec251c0> - changing property masksToBounds in transform-only layer, will have no effect 2015-11-19 17:14:53.980 VRPVisual[8917:2969022] Warning: Attempt to present <MFMailComposeViewController: 0x136c4f200> on <ExportViewController: 0x13a23e960> whose view is not in the window hierarchy!
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