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我有一個類，它是包含4個子viewController的UITabBarController的子類。我添加了一個類似於RedLaser，Instagram，Path，DailyBooth和其他應用程序的按鈕。我的是喜歡這裏的頂部例如：從UITabBarController呈現的Modal viewController
此按鈕調用在TabBarController的方法呈現一個模式的viewController。當它被解散時，當前所選viewController中的NavigationControllers開始出現奇怪的行爲。流行動畫全部搞砸了，其他小錯誤發生，直到您選擇tabBar上的另一個選項卡。然後，動畫很好，直到viewController再次呈現。
我確定這是因爲我錯誤地解僱了它，但我不確定這是如何完成的。
這是我在TabBarController代碼：
-(void)showScanner {
ZBarReaderViewController *reader = [[ZBarReaderViewController alloc] init];
reader.readerDelegate = self;
reader.supportedOrientationsMask = ZBarOrientationMaskAll;
ZBarImageScanner *scanner = reader.scanner;
[scanner setSymbology:ZBAR_I25
config:ZBAR_CFG_ENABLE
to:0];
[scanner setSymbology:ZBAR_QRCODE
config:ZBAR_CFG_ENABLE
to:0];
[reader setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
[self presentModalViewController:reader
animated:YES];
[reader release];
//[self playBeep];
}
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
id<NSFastEnumeration> results = [info objectForKey:ZBarReaderControllerResults];
ZBarSymbol *symbol = nil;
for (symbol in results)
break;
NSString *barcode = symbol.data;
UINavigationController *searchNavController = [[self viewControllers] objectAtIndex:1];
WLSearchViewController *searchVC = [searchNavController.viewControllers objectAtIndex:0];
// WLSearchViewController *searchVC = [[self viewControllers] objectAtIndex:1];
//[searchNavController popToRootViewControllerAnimated:NO];
[self setSelectedViewController:searchNavController];
[self dismissModalViewControllerAnimated:YES];
[self playBeep];
[searchVC handleSearchForTerm:barcode];
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[self dismissModalViewControllerAnimated:YES];
}