如何以编程方式设置UITabBarController的选定选项卡，同时还触发UITabBarControllerDelegate中的shouldSelectViewController

Question

I'm trying to animate the transitions between tabs in my UITabBarController, which is working fine when I push on the tab buttons. However, when I switch tabs programmatically by calling

[self.tabBarController setSelectedIndex:2];

in a swipe gesture recognizer, the shouldSelectViewController function is NOT being called in my UITabBarControllerDelegate delegate, and therefore my animation isn't being triggered.

Is there a way to accomplish what I want? Can I programmatically trigger the tab switch differently perhaps so that the shouldSelectViewController function gets called?

Answer 1

If you have implemented - (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController in your tabBarController's delegate than you can call it manually.

[self.tabBarController.delegate tabBarController:self.tabBarController shouldSelectViewController:[[tabBar viewControllers] objectAtIndex:2]];
[self.tabBarController setSelectedIndex:2];

Hope this helps.