objective c - Cocoa: Button Control in secondary .xib (loaded from MainWindowController) fails to invoke its Action -

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a simple test application using xcode 7.3 under macos 10.10 using objective c.

appdelegate.h     @property mainwindowcontroller *mymainwindowcontroller;  appdelegate.m - (void)applicationdidfinishlaunching:(nsnotification *)anotification {     _mymainwindowcontroller = [[mainwindowcontroller alloc] initwithwindownibname:@"mainwindowcontroller"];      [_mymainwindowcontroller showwindow:self]; }

the mainwindowcontroller.xib mainwindow main view

mainwindowcontroller.h     @property iboutlet nsview * mainview;  //hooked view in mainwindowcontroller.xib  mainwindowcontroller.m - (void)windowdidload {     [super windowdidload];     myxib* vc = [[myxib alloc] initwithnibname:nil bundle:nil];     [_mainview addsubview:[vc view] ]; }

myxib created in xcode subclass of nsviewcontroller. has button object, in view.

myxib.h

@interface myxib : nsviewcontroller - (ibaction)buttonpushed:(id)sender;

myxib.m

- (void)viewdidload {     [super viewdidload]; }  - (ibaction)buttonpushed:(id)sender{     nslog(@"buttonpushed"); }

the action thebutton connected buttonpushed.

when running application, user interface displayed expected. when button clicked, program crashes without ever invoking buttonpushed method. debug window shows stack crawl ending "[nsurl buttonpushed:]: unrecognized selector sent instance.."

i have put in calls viewdidload, awakefromnib, , init. break points in these calls seem show things behaving logically according documentation.

thanks willeke! here fix maintain reference:

#import "mainwindowcontroller.h"  @interface mainwindowcontroller () @property iboutlet nsview * mainview; @property  myxib* vc; // maintain reference!  @end  @implementation mainwindowcontroller  - (void)windowdidload {     [super windowdidload];     //create nsviewcontroller , use load xib     _vc = [myxib alloc];     _vc = [_vc initwithnibname:nil bundle:nil];     [_mainview addsubview:[_vc view] ]; }  @end

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