單擊選項卡更改UITabBarController中的UIViewController

Question

我有UITabBarController 4個選項卡。我在UITabBarController的每個選項卡上都有單獨的4個視圖。我想在每次單擊UITabBarController的第三個選項卡時更改UITabBarController的第二個選項卡的UIViewController。

Answer 1

可以使用的UITabBarController的委託爲做到這一點 -

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController 
{ 
    if ([tabBarController selectedIndex] == 2) 
    { 
     NSMutableArray *arr = [[NSMutableArray alloc] initWithArray:[tabBarController viewControllers]]; 

     NewViewController *nvc = [[NewViewController alloc] init]; 

     [arr replaceObjectAtIndex:1 withObject:nvc]; 

     [nvc release]; 

     [tabBarController setViewControllers:arr]; 
    } 
}