iphone - Navigationbar not showing on pushing view controller -

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i have working on navigation base application. problem when push other view controller navigation controller .view controller viewwillappear not called.

testcategoryhistory *testvc = [[testcategoryhistory alloc] initwithnibname:@"testcategoryhistory" bundle:nil];

[self.navigationcontroller pushviewcontroller:testvc animated:yes]; [testvc release];`

here test's viewwillappear not called.and navigationbar not showing..

make sure current view controller "in" navigation controller. so, can push view controller show.


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