iphone - App just shows a black screen -

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i'm trying make multiview application. started creating 'empty application' thought easiest. have 3 .xib files, first being mainview.xib has view controller linked switch class, , has tool bar switch between 2 views, , have selected .xib 'main interface' thought meant should loaded first. other blue redview.xib , blueview.xib.

i've heard method in appdelegate.m can cause problems, here mine...

- (void)applicationdidfinishlaunching:(uiapplication *)application {      //add switchclasses view main window     [window addsubview:switchobject.view];      [window makekeyandvisible]; }

i don't know whether have missed because started empty application, or if i've messed along way.

thank help.

do this:

window.rootviewcontroller = switchobject;

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