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

Question

我正在尝试在用户点击标签栏按钮时创建自定义标签栏动画。

我已经实现了一个实现了 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;
}

出于某种原因，负责转换的委托(delegate)方法未被调用。我读过 docs并且看不出有任何理由不叫他们。

我已经正确设置了我的委托(delegate)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

我认为您对要完成的任务使用了错误的委托(delegate)方法。尝试使用:

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

这将在用户点击不同的选项卡时调用。