Add possible problems

sunfmin · Dec 17, 2011 · e33579a · e33579a
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diff --git a/_posts/2011-12-17-use-popover-step-by-step.md b/_posts/2011-12-17-use-popover-step-by-step.md
@@ -3,6 +3,8 @@ layout: post
 title: Use popover step by step
 ---
 
+## Correct Steps
+
 1. Create a project
 
 	![image](/images/use-pop-over/p1.png)
@@ -50,3 +52,37 @@ title: Use popover step by step
 
 	![image](/images/use-pop-over/p10.png)
 
+
+## Possible Problems
+
+1. loaded the "PopoverViewController" nib but no view was set.
+
+		2011-12-17 23:17:37.791 UsePopover[3355:707] -[NSViewController loadView] loaded the "PopoverViewController" nib but no view was set.
+		2011-12-17 23:17:37.793 UsePopover[3355:707] (
+			0   CoreFoundation                      0x00007fff924d6286 __exceptionPreprocess + 198
+			1   libobjc.A.dylib                     0x00007fff8ab25d5e objc_exception_throw + 43
+			2   CoreFoundation                      0x00007fff924d60ba +[NSException raise:format:arguments:] + 106
+			3   CoreFoundation                      0x00007fff924d6044 +[NSException raise:format:] + 116
+			4   AppKit                              0x00007fff8b6b9e21 -[NSViewController loadView] + 336
+			5   AppKit                              0x00007fff8b6b5a8a -[NSViewController view] + 41
+			6   AppKit                              0x00007fff8bdcd232 -[NSPopover showRelativeToRect:ofView:preferredEdge:] + 159
+			7   UsePopover                          0x00000001000013db -[AppDelegate popup:] + 203
+			8   CoreFoundation                      0x00007fff924c5a1d -[NSObject performSelector:withObject:] + 61
+			9   AppKit                              0x00007fff8b68c710 -[NSApplication sendAction:to:from:] + 139
+			10  AppKit                              0x00007fff8b68c642 -[NSControl sendAction:to:] + 88
+			11  AppKit                              0x00007fff8b68c56d -[NSCell _sendActionFrom:] + 137
+			12  AppKit                              0x00007fff8b68ba30 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 2014
+			13  AppKit                              0x00007fff8b70b8e0 -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 489
+			14  AppKit                              0x00007fff8b68a63a -[NSControl mouseDown:] + 786
+			15  AppKit                              0x00007fff8b6550e0 -[NSWindow sendEvent:] + 6306
+			16  AppKit                              0x00007fff8b5ed68f -[NSApplication sendEvent:] + 5593
+			17  AppKit                              0x00007fff8b583682 -[NSApplication run] + 555
+			18  AppKit                              0x00007fff8b80280c NSApplicationMain + 867
+			19  UsePopover                          0x00000001000012d2 main + 34
+			20  UsePopover                          0x00000001000012a4 start + 52
+			21  ???                                 0x0000000000000003 0x0 + 3
+		)
+
+This is because `PopoverViewController.xib` 's Controller class `PopoverViewController.xib` 's view property didn't connect to Interface Builder's Custom View, You can do so by this:
+
+	![image](/images/use-pop-over/p11.png)
diff --git a/images/use-pop-over/p11.png b/images/use-pop-over/p11.png