iOS / Objective c - UITabBarControllerDelegate - 未调用自定义选项卡动画委托

Question

当用户点击标签栏按钮时，我正在尝试创建自定义标签栏动画。

我已经实现了一个实现 UITabBarControllerDelegate 的 UITabBarController 子类

这是.m

#import "MYCustomTabBarControler.h"


@interface MYCustomTabBarControler ()

@end

@implementation MYCustomTabBarControler

- (void)viewDidLoad {
    [super viewDidLoad];

    self.delegate = self; // I set the delegate as self

}


#pragma mark - UITabBarControllerDelegate

- (BOOL)tabBarController:(UITabBarController *)tabBarController
shouldSelectViewController:(UIViewController *)viewController {

    //This is called so I know the delegate is working 
    NSLog(@"The tabBarController delegate is set and working");
    return YES;
}

//This delegate method is never called 
- (id<UIViewControllerAnimatedTransitioning>)tabBarController:(UITabBarController *)tabBarController
           UIViewControllerAnimatedTransitioning:(UIViewController *)fromVC
                                             toViewController:(UIViewController *)toVC {


    MYBarTransition *animator = [MYBarTransition new];
    return animator;

}

//This delegate method is never called 
- (id<UIViewControllerInteractiveTransitioning>)tabBarController:(UITabBarController *)tabBarController
                     interactionControllerForAnimationController:(id<UIViewControllerAnimatedTransitioning>)animationController {

    MYBarTransition *animator = [MYBarTransition new];
    return animator;
}

由于某种原因，负责转换的委托方法没有被调用。我已经阅读了docs 并且看不出他们不会被调用的任何原因。

我已正确设置我的委托并确认它是 通过实现 shouldSelectViewController 方法来工作

我在这里错过了什么？

Answer 1

我认为您尝试完成的任务使用了错误的委托方法。尝试使用：

- (nullable id <UIViewControllerAnimatedTransitioning>)tabBarController:(UITabBarController *)tabBarController
            animationControllerForTransitionFromViewController:(UIViewController *)fromVC
                                              toViewController:(UIViewController *)toVC;

当用户点击不同的标签时会调用它。