iOS之导航返回上上个控制器或指定返回某个控制器

popToViewController用法

方式一，不推荐

[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:2] animated:YES];

方式二，推荐

for (UIViewController *controller in self.navigationController.viewControllers) {
    if ([controller isKindOfClass:[你要跳转到的Controller class]]) {
        [self.navigationControllerpopToViewController:controller animated:YES];
    }
}

方式三，推荐  这种方式可以适合返回指定控制器并调用其方法（比如刷新）

// 返回调用的控制器
 LLXXXcontroller *myControl = nil;
    for (int i = 0; i < self.navigationController.viewControllers.count; i++) {

        CustomViewController *cv = self.navigationController.viewControllers[i];
        if ([cv isKindOfClass:[LLXXXcontroller class]]) {

            myControl = (LLXXXcontroller *)cv;
            break;
        }
    }

    [self.navigationController popToViewController:myControl animated:YES];
    [myControl refreshData];