ios 如何以编程方式以模式方式呈现视图控制器？

How can I programmatically present a view controller modally?

提问by Chisx

Edit:When solving this problem, I found that it is much easier to start with your UITabBarController, then perform login validation viayour AppDelegate.m's didFinishLaunchingWithOptions:method.

编辑：在解决这个问题时，我发现从你的 开始UITabBarController，然后通过你AppDelegate.m的didFinishLaunchingWithOptions:方法执行登录验证要容易得多。

Question:This code is in the the application didFinishLaunchingWithOptions:method in my AppDelegate.m

问题：此代码application didFinishLaunchingWithOptions:在我的 AppDelegate.m 中的方法中

if([result isEqualToString: @"log"])
{
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *ivc = [storyboard instantiateViewControllerWithIdentifier:@"TabBarControl"];
    [(UINavigationController*)self.window.rootViewController pushViewController:ivc animated:NO];
    NSLog(@"It's hitting log");
}

It simply takes an HTTP response for the user being logged in, and takes them to my TabBarController. The problem is that it's using a pushrather than a modaltransition to display the page. Since presentModalViewController method is deprecated or deleted in iOS7, how can I programmatically force a modal presentation?

它只是为正在登录的用户获取 HTTP 响应，并将它们带到我的 TabBarController。问题在于它使用推送而不是模式转换来显示页面。由于presentModalViewController 方法在iOS7 中已被弃用或删除，如何以编程方式强制进行模态演示？

EDIT:)

编辑：）

回答by Undo

The old presentViewController:animated:method has been deprecated, we need to use presentViewController:animated:completioninstead. You now simply have to add a completionparameter to the method - this should work:

旧presentViewController:animated:方法已被弃用，我们需要presentViewController:animated:completion改用。您现在只需completion向该方法添加一个参数 - 这应该可以工作：

if([result isEqualToString: @"log"])
{
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *ivc = [storyboard instantiateViewControllerWithIdentifier:@"TabBarControl"];
    [(UINavigationController*)self.window.rootViewController presentViewController:ivc animated:NO completion:nil];
    NSLog(@"It's hitting log");
}

The docs are a good place to start - the docs for UIViewController presentViewController:animatedtell you exactly what you need to know:

文档是一个很好的起点 -文档UIViewController presentViewController:animated告诉您确切需要知道的内容：

presentModalViewController:animated:

Presents a modal view managed by the given view controller to the user. (Deprecated in iOS 6.0. Use presentViewController:animated:completion:instead.)

- (void)presentModalViewController:(UIViewController *)modalViewController animated:(BOOL)animated

presentModalViewController：动画：

向用户呈现由给定视图控制器管理的模态视图。（在 iOS 6.0 中已弃用。presentViewController:animated:completion:改用。）

- (void)presentModalViewController:(UIViewController *)modalViewController animated:(BOOL)animated

回答by Suragch

Swift

迅速

Since the accepted answer is in Objective-C, this is how you would do it in Swift. Unlike the accepted answer, though, this answer does not reference the navigation controller.

由于接受的答案是在 Objective-C 中，这就是您在 Swift 中的做法。但是，与已接受的答案不同，此答案并未引用导航控制器。

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let secondViewController = storyboard.instantiateViewController(withIdentifier: "secondViewController") as! SecondViewController
self.present(secondViewController, animated: true, completion: nil)

Change the storyboard name, view controller, and id as needed.

根据需要更改故事板名称、视图控制器和 id。

See also how to dismiss a view controller programmatically.

另请参阅如何以编程方式关闭视图控制器。

回答by Shahzaib Maqbool

In swift 4.2 you can do it like this. For those who want this answer in swift updated version.

在 swift 4.2 中，你可以这样做。对于那些想要快速更新版本的答案的人。

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let controller = storyboard.instantiateViewController(withIdentifier: "ExampleViewController")
self.present(controller, animated: true, completion: nil)

回答by Sh_Khan

In Swift 3/4

在斯威夫特 3/4

     let storyB = UIStoryboard(name: "Main", bundle: nil) 
     let secondViewController = storyB.instantiateViewController(withIdentifier: "SecondViewControllerID") as! SecondViewController
     self.present(secondViewController, animated: true, completion: nil)

回答by Gregory Wilson Pullyattu

 let storyB = UIStoryboard(name: "Main", bundle: nil) 
 let secondViewController = 
 storyB.instantiateViewController(withIdentifier: 
 "SecondViewControllerID") as! SecondViewController
 self.present(secondViewController, animated: true, completion: nil)

In the secondViewController use this code to go back.

在 secondViewController 中使用此代码返回。

 self.dismiss(animated: true, completion: nil)