Use popover step by step

17 Dec 2011

Correct Steps

1. Create a project

   

2. Drop Popover and View Controller to Objects in Interface Builder

   

3. Ctrl+N to Create a ViewController named PopoverViewController

   

4. Check the PopoverViewController.xib File's Owner to be PopoverViewController

   

5. Change the MainMenu.xib Popover View Controller object's Custom Class to be PopoverViewController

   

6. Ctrl Drag Popover Object to Popover View Controller Object to make Popover Object's delegate to be Popover View Controller

   

7. Set Popover View Controller object of MainMenu.xib 's Nib Name to PopoverViewController

   

8. Ctrl Drag Pop button to link an Action in AppDelegate.m

   

9. Ctrl Drag Popover object to AppDelegate.h to make an Outlet

   

10. Finish the Button Action to pop up work

     - (IBAction)popup:(id)sender {
        [_popover showRelativeToRect:[sender bounds] ofView:sender preferredEdge:CGRectMinXEdge];
     }
    

11. Build and Run

    

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 File's Owner / Controller class PopoverViewController 's view property didn't connect to Interface Builder's Custom View, You can do so by this: