西山夜色

问题描述

项目新版本提测时经测试反馈发现iOS14系统在跳转多级页面后返回到根控制器时tabbar消失了,经过排查发现触发条件如下:

1.Xcode Version >=12.0.

2.ios Version>=14.0 && Version<14.2.

3.push层级大于2级.

4.执行[self.navigationController popToRootViewControllerAnimated:YE]跟[self.navigationController popToViewController:viewController animated:YES]且viewController为根控制器这两个方法的时候,animated为YES.

问题原因

假设A为根控制器,跳转流程为A->B->C

- (NSArray<UIViewController *> *)fd_popToRootViewControllerAnimated:(BOOL)animated {

  //第一步

    NSLog(@"%@", self.viewControllers);

    NSArray *popedControllerArray = [selffd_popToRootViewControllerAnimated:animated];

    //第二步

    NSLog(@"viewControllers = %@", self.viewControllers);

    returnpopedControllerArray;

}

打印发现上述情况下:

第一步

viewControllers = (

A,

B,

C

)

第二步

viewControllers = (

C,

A

)

正常情况下:

第一步

viewControllers = (

A,

B,

C

)

第二步

viewControllers = (

A

)

可以发现问题就出现在第二步,在有问题的情况下,viewControllers里的对象会多一个顶部控制器C,C的hidesBottomBarWhenPushed属性会覆盖根控制器A的hidesBottomBarWhenPushed属性,但是C的hidesBottomBarWhenPushed属性为YES,所以造成了tabbar不显示问题

解决方法

解决办法从出现问题的4个原因,其中一方面入手都能解决

1.添加分类,在hooc方法里把animated属性改为NO

- (NSArray<UIViewController *> *)fd_popToRootViewControllerAnimated:(BOOL)animated{

    if ([[UIDevice currentDevice].systemVersion doubleValue] == 14.1 || [[UIDevice currentDevice].systemVersion doubleValue] == 14.0) {

        animated =NO;

    }

    NSArray *popedControllerArray = [selffd_popToRootViewControllerAnimated:animated];

    return popedControllerArray;

}

- (NSArray *)fd_popToViewController:(UIViewController*)viewControlleranimated:(BOOL)animated{

    if ([[UIDevice currentDevice].systemVersion doubleValue] == 14.1 || [[UIDevice currentDevice].systemVersion doubleValue] == 14.0) {

        animated =NO;

    }

    NSArray *popedControllerArray = [self fd_popToViewController:viewControlleranimated:animated];

    return popedControllerArray;

}

2.添加分类,在hooc方法里把 self.topViewController的hidesBottomBarWhenPushed属性设置为NO

- (NSArray<UIViewController *> *)fd_popToRootViewControllerAnimated:(BOOL)animated{

    if (self.viewControllers.count > 1) {

        self.topViewController.hidesBottomBarWhenPushed = NO;

    }

    NSArray<UIViewController *> *popedControllerArray = [self fd_popToRootViewControllerAnimated:animated];

    return popedControllerArray;

}

- (NSArray<UIViewController *> *)fd_popToViewController:(UIViewController *)viewController animated:(BOOL)animated{

    if (self.viewControllers.count > 1) {

        self.topViewController.hidesBottomBarWhenPushed = NO;

    }

    NSArray<UIViewController *> *popedControllerArray = [self fd_popToViewController:viewController animated:animated];

    return popedControllerArray;

}