Question

当我切换回模拟器中的设置时，Xcode中显示错误。如果有人知道请通知我。提前致谢

GeoNet[2325:41287] 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                      0x00c5ba14 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x0071ce02 objc_exception_throw + 50
    2   CoreFoundation                      0x00c5b93d +[NSException raise:format:] + 141
    3   Foundation                          0x004ee74b _AssertAutolayoutOnMainThreadOnly + 96
    4   Foundation                          0x003164c1 -[NSISEngine optimize] + 67
    5   Foundation                          0x00316f84 -[NSISEngine withBehaviors:performModifications:] + 245
    6   Foundation                          0x0031a404 -[NSISEngine withAutomaticOptimizationDisabled:] + 48
    7   UIKit                               0x01dd9b08 -[UIView(AdditionalLayoutSupport) _withAutomaticEngineOptimizationDisabledIfEngineExists:] + 75
    8   UIKit                               0x01dda781 -[UIView(AdditionalLayoutSupport) updateConstraintsIfNeeded] + 278
    9   UIKit                               0x01aa48b8 -[UITableViewCellContentView updateConstraintsIfNeeded] + 185
    10  UIKit                               0x01ddb66c -[UIView(AdditionalLayoutSupport) _updateConstraintsAtEngineLevelIfNeeded] + 372
    11  UIKit                               0x014a919a -[UIView(Hierarchy) _updateConstraintsAsNecessaryAndApplyLayoutFromEngine] + 173
    12  UIKit                               0x014a9929 -[UIView(Hierarchy) layoutSubviews] + 184
    13  UIKit                               0x014bb008 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 810
    14  libobjc.A.dylib                     0x00731059 -[NSObject performSelector:withObject:] + 70
    15  QuartzCore                          0x0603480a -[CALayer layoutSublayers] + 144
    16  QuartzCore                          0x060284ee _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 388
    17  QuartzCore                          0x06028352 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 26
    18  QuartzCore                          0x0601ae8b _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 317
    19  QuartzCore                          0x0604ee03 _ZN2CA11Transaction6commitEv + 561
    20  QuartzCore                          0x0604f1ab _ZN2CA11Transaction14release_threadEPv + 289
    21  libsystem_pthread.dylib             0x0308d2f7 _pthread_tsd_cleanup + 93
    22  libsystem_pthread.dylib             0x0308d051 _pthread_exit + 108
    23  libsystem_pthread.dylib             0x0308d734 pthread_get_stackaddr_np + 0
    24  libsystem_pthread.dylib             0x0308ae0e start_wqthread + 30
)

Answer 1

这是从iOS 9开始发生的，在早期版本中，您的代码可以正常工作。这是因为，您的某些函数必须在后台线程上执行，并在视图加载后尝试更改视图的外观。因此，您必须将该函数放在主线程上并异步加载它。请分享您正在尝试加载的ViewController的代码，以获得更具体的答案。

dispatch_async(dispatch_get_main_queue(), ^{
// your code here
})

Answer 2

在我的OS X中使用swift遇到了这个错误：“这个应用程序正在从后台线程修改自动布局引擎，这可能导致引擎损坏和奇怪的崩溃。这将导致未来版本中的异常。”

请参阅this链接，您可以找到解决方案。

当我在模拟器上运行我的应用程序时，它不会在模拟器设置和位置服务下显示我的应用程序

2 个答案: