iphone - ModalView doesnt show up with tabbarcontroller -

i building app has login screen leads tabbar. followed example on how push modal view once launch app (as "sign in" page) , dismiss it.

example --> show / hide tab bar

from reason, it's not working - when launch app, see tabbar view 2 view controllers. no sign in page.

here code:

appdelegate:

- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions {  // override point customization after application launch. self.window = [[uiwindow alloc] initwithframe:[[uiscreen mainscreen] bounds]]; uiviewcontroller *viewcontroller1 = [[firsttab alloc] initwithnibname:@"firsttab" bundle:nsbundle.mainbundle]; uiviewcontroller *viewcontroller2 = [[secondtab alloc] initwithnibname:@"secondtab" bundle:nsbundle.mainbundle]; uinavigationcontroller *secondnavcontroller = [[uinavigationcontroller alloc]initwithrootviewcontroller:viewcontroller2]; self.tabbarcontroller = [[uitabbarcontroller alloc] init]; self.tabbarcontroller.viewcontrollers = [nsarray arraywithobjects:viewcontroller1, secondnavcontroller, nil];  self.window.rootviewcontroller = self.tabbarcontroller; [self.window makekeyandvisible]; return yes;  } 

my first tab (which understand modal view business needs happen)

.h

@interface firsttab : uiviewcontroller  @end 

.m

//updated code per comment below

- (void)viewdidload { [super viewdidload]; signin *loginview = [[signin alloc] initwithnibname:@"signin" bundle:nil]; uinavigationcontroller *controller = [[uinavigationcontroller alloc] initwithrootviewcontroller: loginview]; self.hidesbottombarwhenpushed = yes;  [self presentmodalviewcontroller:controller animated:yes];   } 

and of course, dismiss modal view in signin view controller, though never there mentioned.

what doing wrong here? help!!

you use :

[[self tabbarcontroller] presentmodalviewcontroller:controller animated:yes]; 

since first viewcontroller1 first tab, , self.navigationcontroller might nil.

in custom view controller subclass called signin implement initwithnibname:bundle: instead if init.

-(id)initwithnibname:(nsstring *)nibnameornil               bundle:(nsbundle *)nibbundleornil {     self = [super initwithnibname:nibnameornil bundle:nibbundleornil];     if (self) {         // init here     } } 

now when init/alloc call either :

signin *loginview = [[signin alloc] initwithnibname:@"signin" bundle:nil]; 

if interface in nib file, or :

signin *loginview = [[signin alloc] initwithnibname:nil bundle:nil]; 

if there no nib.

also why putting root view controller of navigation controller ? unless need go deeper in model data presentation, present directly :

// why ? //uinavigationcontroller *controller = [[uinavigationcontroller alloc] //                                      initwithrootviewcontroller: loginview]; //self.hidesbottombarwhenpushed = yes;  //[self presentmodalviewcontroller:controller animated:yes]; [self presentmodalviewcontroller:loginview animated:yes];