页面三级跳转,一键返回到一级页面的需求

1. 获取到所有的控制器的数组，当页面跳转到C页面的时候，就将B页面从数据中移除掉，这样点击返回按钮的时候，页面直接就跳转到了A页面。

- (void)back {
    NSMutableArray *vcArr = [NSMutableArray arrayWithArray:self.navigationController.viewControllers];
    [vcArr removeObjectAtIndex:vcArr.count-2]; // 将上级页面从数组中移除
    self.navigationController.viewControllers = vcArr;
    [self.navigationController popViewControllerAnimated:YES];
}

2. 直接在控制器数组中找到想要跳转的那个控制器所在的位置，获取到该控制器，然后进行pop

NSInteger num = self.navigationController.viewControllers.count;
if (num > 3) {
   UIViewController *popVC = self.navigationController.viewControllers[num - 3];
   [self.navigationController popToViewController:popVC animated:YES];
}

3. 在C页面定义Block,当点击返回调用Block事件,在Block里面写返回事件

typedef void(^BackBlock)(void);
@property (nonatomic, copy) BackBlock backBlock;
- (void)back {
    [self.navigationController popViewControllerAnimated:NO];
    __weak typeof(self) weakSelf = self;
    weakSelf.backBlock();
}

B.m:
C_Controller *vc = [[C_Controller alloc] init];
vc.backBlock = ^(){
    [self.navigationController popViewControllerAnimated:NO];
};
[self.navigationController pushViewController:vc animated:YES];

4.

for (UIViewController *vc in self.navigationController.viewControllers) {
            if ([vc isKindOfClass:[MineViewController class]]) {
                [self.navigationController popToViewController:vc animated:YES];
            }
        }

5.

[self.navigationController pushViewController:vc animated:YES];

 UINavigationController *nav = self.navigationController;
 UIViewController *root = nav.viewControllers[0];
 nav.viewControllers = @[root,vc];