objective-c - 更新到 macOS Mojave 后 [NSWindow orderFrontRegardless] 崩溃

Question

更新到 Mojave 后出现奇怪的崩溃。

没有做任何特别的事情，只是创建一个 NSWindow 并调用 orderFrontRegardless

之前一直运行良好。

1   libsystem_platform.dylib            0x00007fff6610ab5d _sigtramp + 29
2   ???                                 0x0000000000000000 0x0 + 0
3   CoreFoundation                      0x00007fff39b00bb6 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
4   CoreFoundation                      0x00007fff39b00b30 ___CFXRegistrationPost_block_invoke + 63
5   CoreFoundation                      0x00007fff39b00a9a _CFXRegistrationPost + 404
6   CoreFoundation                      0x00007fff39b08f48 ___CFXNotificationPost_block_invoke + 87
7   CoreFoundation                      0x00007fff39a71994 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1642
8   CoreFoundation                      0x00007fff39a70d47 _CFXNotificationPost + 732
9   Foundation                          0x00007fff3bdab217 -[NSNotificationCenter postNotificationName:object:userInfo:] + 66
10  AppKit                              0x00007fff3720538b -[NSWindow _setFrameCommon:display:stashSize:] + 3090
11  AppKit                              0x00007fff37204766 -[NSWindow _setFrame:display:allowImplicitAnimation:stashSize:] + 192
12  AppKit                              0x00007fff3720469f -[NSWindow setFrame:display:] + 51
13  AppKit                              0x00007fff3727aca9 -[NSWindow _reallyDoOrderWindowAboveOrBelow:relativeTo:findKey:forCounter:force:isModal:] + 1336
14  AppKit                              0x00007fff372792a0 -[NSWindow _doOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 283
15  AppKit                              0x00007fff37a0dce9 -[NSWindow orderFrontRegardless] + 40

代码(这是一个控制台应用程序):

NSWindow *window =    [[NSWindow alloc] initWithContentRect:windowRect
styleMask:windowStyle
backing:NSBackingStoreBuffered
defer:NO];

// Since Snow Leopard, programs without application bundles and Info.plist
// files don't get a menubar and can't be brought to the front unless the
// presentation option is changed
[NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];

 [NSApp activateIgnoringOtherApps:YES];
 [window makeKeyAndOrderFront:nil];

Answer 1

如何初始化应用程序？在使用 AppKit 之前，您是否已初始化 NSApplication？

像这些步骤在 main.m 中应该是必要的:

@autoreleasepool {
    NSApplication* application = NSApplication.sharedApplication;

    AppDelegate* delegate = [[AppDelegate alloc] init];
    application.delegate = delegate;

    [application run];
}

您的委托(delegate)也可能会被释放，因为 NSApp 持有对它的弱引用。