如何以编程方式创建NSPopover

Question

我没有找到一些使用Interface Builder动态创建NSPopover的示例。

下面的代码给出了一个例外，加载笔尖，但没有视图设置：

NSViewController *controller = [[NSViewController alloc] initWithNibName:@"View"  bundle:nil]; 
NSPopover *popover = [[NSPopover alloc] init]; 
[popover setContentSize:NSMakeSize(100.0f, 100.0f)]; 
[popover setContentViewController:controller]; 
[popover setAnimates:YES]; 
[popover showRelativeToRect:[sender bounds] ofView:sender preferredEdge:NSMaxXEdge]; 
[popover release]; 
[controller release]; 

这里是堆栈跟踪：

2011-10-22 12:00:16.804 Test[2020:707] -[NSViewController loadView] loaded the "View" nib but no view was set. 
2011-10-22 12:00:16.807 Test[2020:707] (
0 CoreFoundation      0x00007fff87e10286 __exceptionPreprocess + 198 
1 libobjc.A.dylib      0x00007fff92f2cd5e objc_exception_throw + 43 
2 CoreFoundation      0x00007fff87e100ba +[NSException raise:format:arguments:] + 106 
3 CoreFoundation      0x00007fff87e10044 +[NSException raise:format:] + 116 
4 AppKit        0x00007fff90951e21 -[NSViewController loadView] + 336 
5 AppKit        0x00007fff9094da8a -[NSViewController view] + 41 
6 AppKit        0x00007fff91065232 -[NSPopover showRelativeToRect:ofView:preferredEdge:] + 159 
7 Test        0x000000010000159a -[OITAppDelegate show:] + 570 
8 CoreFoundation      0x00007fff87dffa1d -[NSObject performSelector:withObject:] + 61 
9 AppKit        0x00007fff90924710 -[NSApplication sendAction:to:from:] + 139 
10 AppKit        0x00007fff90924642 -[NSControl sendAction:to:] + 88 
11 AppKit        0x00007fff9092456d -[NSCell _sendActionFrom:] + 137 
12 AppKit        0x00007fff90923a30 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 2014 
13 AppKit        0x00007fff909a38e0 -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 489 
14 AppKit        0x00007fff9092263a -[NSControl mouseDown:] + 786 
15 AppKit        0x00007fff908ed0e0 -[NSWindow sendEvent:] + 6306 
16 AppKit        0x00007fff9088568f -[NSApplication sendEvent:] + 5593 
17 AppKit        0x00007fff9081b682 -[NSApplication run] + 555 
18 AppKit        0x00007fff90a9a80c NSApplicationMain + 867 
19 Test        0x00000001000012f2 main + 34 
20 Test        0x00000001000012c4 start + 52 
21 ???         0x0000000000000003 0x0 + 3 

Answer 1

的问题是不是在NSPopover; NSViewController引发异常，并且它表示虽然nib加载成功，但它的view属性仍然是nil。

在界面生成器

打开“View.nib”和分配文件所有者的view出口到该控制器应该代表（NSViewContoller成为文件所有者时它加载一个笔尖）视图对象。这是通过Ctrl-从文件所有者图标拖动到视图的图标，然后从插座列表中选择view完成的。