切换到特定索引处的UITabBarController

Question

我正在尝试切换回特定索引处的UITabBarController。我的方法似乎不起作用。这是我的代码：

BaseViewController.m

-(void)switchTabView: (NSString*) viewName inx: (int) index
{
    UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:nil];
    UITabBarController *view = [storyBoard instantiateViewControllerWithIdentifier:viewName];
    view.tabBarController.selectedIndex = index;
    [self presentViewController:view animated:YES completion:nil];
}

ChildViewController.m（继承BaseViewController）

- (IBAction)backButtonClicked:(id)sender
{
    [self switchTabView:@"tabView" inx:1];
}

它返回到UITabBarController，但索引参数似乎并不重要，因为它总是转到索引0。

Answer 1

尝试更改

-(void)switchTabView: (NSString*) viewName inx: (int) index
{
    UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:nil];
    UITabBarController *view = [storyBoard instantiateViewControllerWithIdentifier:viewName];
    view.tabBarController.selectedIndex = index;
    [self presentViewController:view animated:YES completion:nil];
}

到

-(void)switchTabView: (NSString*) viewName inx: (int) index
{
    UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:nil];
    UITabBarController *view = [storyBoard instantiateViewControllerWithIdentifier:viewName];
    view.selectedIndex = index;
    [self presentViewController:view animated:YES completion:nil];
}