与NSWindowController和ARC的奇怪的问题 [英] Weird issue with NSWindowController and ARC

问题描述

好的，这是我面对的一个奇怪的情况：

• NSWindowController 子类， myMainWindow.xib 中的窗口和 AppDelegate.m 调用 NSWindowController 如下：

• I've got an NSWindowController subclass, a window in myMainWindow.xib and the AppDelegate.m invoking the NSWindowController like this :

myWindowController* controller = [[myWindowController alloc] initWithWindowNibName:@"myMainWindow"];
[controller showWindow:self];

strong>

Now here's what :

• 当ARC设置为 NO 时，


• 当我将ARC设置为 YES 时 - 立即设置它） - 它显示一堆错误：

• When ARC is set to NO, then the app runs fine and the windows shows up ok, too.
• When I set ARC to YES - immediately after I set it (and for JUST 1 run) - it shows a bunch of errors :

Feb 17 16:35:45 DrKameleons-iMac。本地MyApp [16903]：
kCGErrorIllegalArgument：_CGSFindSharedWindow：WID 2409 Feb 17
16:35:45 DrKameleons-iMac.local MyApp [16903]：kCGErrorFailure：
设置断点@ CGErrorBreakpoint捕获错误，因为它们是
记录。 Feb 17 16:35:45 DrKameleons-iMac.local MyApp [16903]：
kCGErrorIllegalArgument：CGSOrderFrontConditionally：无效的窗口

Feb 17 16:35:45 DrKameleons-iMac.local MyApp[16903] : kCGErrorIllegalArgument: _CGSFindSharedWindow: WID 2409 Feb 17 16:35:45 DrKameleons-iMac.local MyApp[16903] : kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged. Feb 17 16:35:45 DrKameleons-iMac.local MyApp[16903] : kCGErrorIllegalArgument: CGSOrderFrontConditionally: Invalid window

现在，如果我尝试重新运行应用程序（没有改变任何东西，ARC仍然是ON）窗口仍然不显示。但是没有任何错误。 ：S

Now if I try rerunning the app (without changing anything, ARC is still ON) the window still doesn't show up. But there is no error at all. :S

发生了什么事？

提示：

• 在Mac OS X 10.7.5上运行


• Xcode版本：4.5.1

推荐答案

当ARC打开时，LOCAL控制器在showWindow调用后立即释放！但由于窗口被延迟，窗口甚至还没有 - 甚至是，它将是'无控制器'_
窗口不保留其控制器:)只有反之亦然

when ARC is on, the LOCAL controller is released right after its showWindow call! but as windows are deferred, the window isn't even there yet -- and even it were, it would be 'controller-less'
the Window does NOT retain its controller :) only vice-versa

修复是记住对控制器的引用直到您的appDelegate被释放/直到您退出

the fix is to remember a reference to the controller Until your appDelegate is deallocated/until you quit

@implementation AppDelegate {
    myWindowController* _controller;
}

...
_controller = [[myWindowController alloc] initWithWindowNibName:@"myMainWindow"];
[_controller showWindow:self];

---

发生和它只是泄漏！ ARC确实添加了一个释放调用（因为它正确地看到控制器不再使用）

---

your code works without arc because no release of controller happens and it just leaks! ARC does add a release call though (as it correctly sees controller is no longer used)

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