带有应用沙盒的 Cocoa 应用程序中的 NSOpenPanel 出现错误

Question

我正在我的 Cocoa 应用程序中做一个简单的文件打开面板。我启用了权利和应用沙盒，现在下面的代码在 setFloatingPanel 上给了我一个错误。不知道为什么？

NSArray* fileTypes = [[NSArray alloc] initWithObjects:@"png", @"PNG", nil];  
NSOpenPanel *panel;
panel = [NSOpenPanel openPanel];
[panel setTitle:@"Select Photo"];
[panel setFloatingPanel:YES];

导致以下错误

2012-02-14 11:43:45.831 MyApp[451:707] -[NSRemoteOpenPanel setFloatingPanel:]: unrecognized selector sent to instance 0x400886ea0
2012-02-14 11:43:45.832 MyApp[451:707] -[NSRemoteOpenPanel setFloatingPanel:]: unrecognized selector sent to instance 0x400886ea0
2012-02-14 11:43:45.837 MyApp[451:707] (
    0   CoreFoundation                      0x00007fff83b18286 __exceptionPreprocess + 198
    1   libobjc.A.dylib                     0x00007fff8b7f0d5e objc_exception_throw + 43
    2   CoreFoundation                      0x00007fff83ba44ce -[NSObject doesNotRecognizeSelector:] + 190
    3   CoreFoundation                      0x00007fff83b05133 ___forwarding___ + 371
    4   CoreFoundation                      0x00007fff83b04f48 _CF_forwarding_prep_0 + 232
    5   MyApp                               0x0000000100019f77 openFiles + 519
    6   MyApp                               0x0000000100012b19 -[MyController addImageButtonClicked:] + 25
    7   CoreFoundation                      0x00007fff83b07a1d -[NSObject performSelector:withObject:] + 61
    8   AppKit                              0x00007fff878d9710 -[NSApplication sendAction:to:from:] + 139
    9   AppKit                              0x00007fff878d9642 -[NSControl sendAction:to:] + 88
    10  AppKit                              0x00007fff878d956d -[NSCell _sendActionFrom:] + 137
    11  AppKit                              0x00007fff878d8a30 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 2014
    12  AppKit                              0x00007fff879588e0 -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 489
    13  AppKit                              0x00007fff878d763a -[NSControl mouseDown:] + 786
    14  AppKit                              0x00007fff878a20e0 -[NSWindow sendEvent:] + 6306
    15  AppKit                              0x00007fff8783a68f -[NSApplication sendEvent:] + 5593
    16  AppKit                              0x00007fff877d0682 -[NSApplication run] + 555
    17  AppKit                              0x00007fff87a4f80c NSApplicationMain + 867
    18  MyApp                               0x0000000100001f4c main + 44
    19  MyApp                               0x0000000100001f14 start + 52
    20  ???                                 0x0000000000000003 0x0 + 3
)

Answer 1

正如您所提到的，您已启用应用沙盒，这就解释了为什么您会在崩溃日志中看到 NSRemoteOpenPanel。

显然 Apple 的 NSRemoteOpenPanel 并非源自 NSOpenPanel 或 NSSavePanel 或 NSPanel（这是定义 setFloatingPanel 方法的地方）。

我建议在http://bugreporter.apple.com 提交增强请求（或错误）

也可能是 Apple 不希望沙盒应用程序具有位于“正常”窗口层之外的浮动面板或窗口，在这种情况下，您的错误将很快被关闭或评论。