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问题:我有一个窗口mainWindow和另一个childWindow添加到mainWindow.childWindow是一种WindowExt类.这个类我定义了[NSWindow becomeKeyWindow]必须在之后调用的catch方法调用[childWindow makeKeyWindow].如果我创建childWindow并尝试在下一个方向上使它成为keyWindow:

WindowExt *childWindow = [[WindowExt alloc] initWithContentRect:addedWindowRect
                           styleMask:NSBorderlessWindowMask | NSTitledWindowMask
                             backing:NSBackingStoreBuffered 
                               defer:NO];
[mainWindow addChildWindow:childWindow ordered:NSWindowAbove];
[childWindow makeKeyWindow];

方法[WindowExt becomeKeyWindow]对childWindow被称为-无一不精,childWindow成为keyWindow.

但是,如果我创建childWindow为

WindowExt *childWindow = [[WindowExt alloc] initWithContentRect:addedWindowRect
styleMask:NSBorderlessWindowMask 
backing:NSBackingStoreBuffered
defer:NO];
[mainWindow addChildWindow:childWindow ordered:NSWindowAbove];
[childWindow makeKeyWindow];

没有NSTitledWindowMask,[WindowExt becomeKeyWindow]因为childWindow从未被称为 - childWindow不会成为关键窗口.