致力于在 iOS9 应用程序中实现 NSUndoManager。当前的撤消代码如下所示:
func setActiveColorData(colorData: ColorData) {
if colorData != activeColorData {
print(self)
undoManager?.registerUndoWithTarget(self, selector: "setActiveColorData:", object: activeColorData!)
undoManager?.setActionName("Change color")
print("Set undo action")
activeColorData = colorData
}
}
ColorData 只是一个简单的类，其中包含三个 float (色调、饱和度、亮度)和一些实用方法。
一切正常，包括弹出撤消提示的摇动手势。但是一旦您单击撤消，应用程序就会崩溃并出现以下错误:
2016-02-25 16:26:58.225 Color[89399:5503615] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Color.PickerViewController setActiveColorData:]: unrecognized selector sent to instance 0x7fa080776820'
*** First throw call stack:
(
0 CoreFoundation 0x0000000105b75e65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000108159deb objc_exception_throw + 48
2 CoreFoundation 0x0000000105b7e48d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x0000000105acb90a ___forwarding___ + 970
4 CoreFoundation 0x0000000105acb4b8 _CF_forwarding_prep_0 + 120
5 Foundation 0x00000001066b2feb -[_NSUndoStack popAndInvoke] + 261
6 Foundation 0x00000001066b2162 -[NSUndoManager undoNestedGroup] + 424
7 UIKit 0x0000000106c46813 -[UIApplication alertView:clickedButtonAtIndex:] + 151
8 UIKit 0x0000000106f63589 -[UIAlertView _prepareToDismissForTappedIndex:] + 136
9 UIKit 0x0000000106f62fc7 __35-[UIAlertView _prepareAlertActions]_block_invoke50 + 53
10 UIKit 0x0000000106f54572 -[UIAlertController _dismissAnimated:triggeringAction:triggeredByPopoverDimmingView:] + 133
11 UIKit 0x0000000107604eb6 -[_UIAlertControllerView _handleActionSelectionGestureRecognizer:] + 694
12 UIKit 0x000000010711ee73 _UIGestureRecognizerSendTargetActions + 153
13 UIKit 0x000000010711b4e5 _UIGestureRecognizerSendActions + 162
14 UIKit 0x00000001071194e2 -[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 843
15 UIKit 0x00000001071219a0 ___UIGestureRecognizerUpdate_block_invoke904 + 79
16 UIKit 0x000000010712183e _UIGestureRecognizerRemoveObjectsFromArrayAndApplyBlocks + 342
17 UIKit 0x000000010710f101 _UIGestureRecognizerUpdate + 2634
18 UIKit 0x0000000106ca6f8a -[UIWindow _sendGesturesForEvent:] + 1137
19 UIKit 0x0000000106ca81c0 -[UIWindow sendEvent:] + 849
20 UIKit 0x0000000106c56b66 -[UIApplication sendEvent:] + 263
21 UIKit 0x0000000106c30d97 _UIApplicationHandleEventQueue + 6844
22 CoreFoundation 0x0000000105aa1a31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
23 CoreFoundation 0x0000000105a9795c __CFRunLoopDoSources0 + 556
24 CoreFoundation 0x0000000105a96e13 __CFRunLoopRun + 867
25 CoreFoundation 0x0000000105a96828 CFRunLoopRunSpecific + 488
26 GraphicsServices 0x000000010a416ad2 GSEventRunModal + 161
27 UIKit 0x0000000106c36610 UIApplicationMain + 171
28 Color 0x00000001052a2a7d main + 109
29 libdyld.dylib 0x0000000108c9992d start + 1
30 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
我已经检查了 PickerViewController 实例和内存位置是否匹配(来自 print(self) 行，在本例中是 0x7fa080776820)。知道为什么它不能调用这个选择器吗？或者是别的什么？谢谢!
最佳答案
当内存不足时，我在照片编辑应用程序中看到了同样类型的崩溃。当我收到内存警告时，我会清除撤消管理器，但就我而言，我相信发生此崩溃是因为内存从撤消管理器下被删除。
关于ios - NSUndoManager 错误为 "unrecognized selector sent to instance"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35633063/