Question

我正在尝试在所有其他视图之上的新窗口中添加UIAlertController。工作正常，但每次出现窗口时都试图打破自动布局。

    let topWindow = UIApplication.sharedApplication().keyWindow!

    let alertWin = UIWindow(frame: UIScreen.mainScreen().bounds)
    alertWin.rootViewController = UIViewController()
    alertWin.tintColor = UIApplication.sharedApplication().keyWindow!.tintColor
    alertWin.windowLevel = topWindow.windowLevel + 1
    alertWin.makeKeyAndVisible()

    let alert = UIAlertController(title: "TITLE", message: text, preferredStyle: .Alert)
    let OKAction = UIAlertAction(title: "OK", style: .Default) { _ in                                    
       alertWin.rootViewController?.presentingViewController?.dismissViewControllerAnimated(true, completion: nil)
       alertWin.hidden = true
       alertWin.rootViewController = nil
       alertWin.removeFromSuperview()
    }
    alert.addAction(OKAction)
    alertWin.rootViewController?.presentViewController(alert, animated: true, completion: nil)

我已经尝试将这个片段和动作闭包内容放入主线程中，但没有运气

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                      0x000000010ed36d85 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x000000010e0aedeb objc_exception_throw + 48
    2   CoreFoundation                      0x000000010ed36cbd +[NSException raise:format:] + 205
    3   Foundation                          0x000000010de22b6b _AssertAutolayoutOnMainThreadOnly + 79
    4   Foundation                          0x000000010dc82357 -[NSISEngine withBehaviors:performModifications:] + 31
    5   UIKit                               0x0000000111292adb -[UIView(AdditionalLayoutSupport) _withAutomaticEngineOptimizationDisabledIfEngineExists:] + 58
    6   UIKit                               0x000000011129361e -[UIView(AdditionalLayoutSupport) updateConstraintsIfNeeded] + 254
    7   UIKit                               0x0000000111283c47 -[UIWindow(UIConstraintBasedLayout) updateConstraintsIfNeeded] + 108
    8   UIKit                               0x0000000111294333 -[UIView(AdditionalLayoutSupport) _updateConstraintsAtEngineLevelIfNeeded] + 272
    9   UIKit                               0x0000000110a48a96 -[UIView(Hierarchy) _updateConstraintsAsNecessaryAndApplyLayoutFromEngine] + 159
    10  UIKit                               0x0000000110a256f6 -[UIWindow layoutSubviews] + 43
    11  UIKit                               0x0000000110a58980 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 703
    12  QuartzCore                          0x0000000110585c00 -[CALayer layoutSublayers] + 146
    13  QuartzCore                          0x000000011057a08e _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
    14  QuartzCore                          0x0000000110579f0c _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
    15  QuartzCore                          0x000000011056e3c9 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 277
    16  QuartzCore                          0x000000011059c086 _ZN2CA11Transaction6commitEv + 486
    17  QuartzCore                          0x000000011059c378 _ZN2CA11Transaction14release_threadEPv + 224
    18  libsystem_pthread.dylib             0x00000001139c8387 _pthread_tsd_cleanup + 470
    19  libsystem_pthread.dylib             0x00000001139c7f63 _pthread_exit + 117
    20  libsystem_pthread.dylib             0x00000001139c6582 pthread_attr_getschedpolicy + 0
    21  libsystem_pthread.dylib             0x00000001139c4341 start_wqthread + 13
)

添加UIWindow会从后台

0 个答案: