iphone - Setting rootViewController for ipad 3.2 doesnt work -

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i did simple navigationbased app. works on iphone well, doesnt work on ipad 3.2 simulator , device.

in applicationdidfinish event;

mainviewcontroller *viewcontroller = [[mainviewcontroller alloc] initwithnibname:@"mainview" bundle:nil]; [self.navigationcontroller pushviewcontroller:viewcontroller animated:no]; self.window.rootviewcontroller = self.navigationcontroller; [viewcontroller release];

it says line:

self.window.rootviewcontroller = self.navigationcontroller;

[uiwindow setrootviewcontroller:]: unrecognized selector sent instance 0x4c22dd0

but works on ipad 4.2 , over.

how can solve ipad 3.2?

uiwindow did not have rootviewcontroller property in ios < 4.0. therefore, need check version (google it) , either set rootviewcontroller, or add navigationcontroller's view subview window below, based on version user running.:

[self.window addsubview:self.navigationcontroller.view];

quick edit: check if can use rootviewcontroller property, can check if [self.window respondstoselector:@selector(setrootviewcontroller)] returns true or false.


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