iOS - 关于存在和推送控制器的一些问题

Question

这里有三个控制器，AViewController，BViewController，CViewController， 第一步：AViewController呈现给BViewController;

BViewController *BVC = [[BViewController alloc]init];
[self presentViewController:BVC animated:YES completion:nil];

第二步：BViewController推送到CViewController;

CViewController *CVC = [[CViewController alloc]init];
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:CVC];
[self.navigationController pushViewController:nav animated:YES];

现在，如果我想从CViewController返回AViewController，我应该编写什么代码？

Answer 1

只需使用此代码：

self.dismissViewControllerAnimated(true, completion: nil)

解除C ViewController，因为C ViewController现在位于导航堆栈上。一个包含B ViewController的导航控制器。 B ViewController push C ViewController，因此C仍在导航控制器中。

你可以在这里查看我的项目：

https://github.com/khuong291/TestTransition

Answer 2

你应该像这样展示BViewController：

BViewController *BVC = [[BViewController alloc]init];
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:BVC];
//Setting For Transparent
nav.providesPresentationContextTransitionStyle = YES;
nav.definesPresentationContext = YES;
nav.modalPresentationStyle = UIModalPresentationOverCurrentContext;

[self presentViewController:nav animated:YES completion:nil];

并在BViewController中实现：

- (void)viewWillDisappear:(BOOL)animated {

     [self.navigationController setNavigationBarHidden:YES];


}

- (void)viewWillDisappear:(BOOL)animated{
    [self.navigationController setNavigationBarHidden:NO];
}

你可以推送到CViewController：

CViewController *CVC = [[CViewController alloc]init];
[self.navigationController pushViewController:CVC animated:YES];

当你想要回到A.简单地在C中调用它：

[self dismissViewControllerAnimated:YES completion:nil];