如何以编程方式以模态方式呈现视图控制器？

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

编辑：当解决这个问题时，我发现从UITabBarController开始更容易，然后通过AppDelegate.m的didFinishLaunchingWithOptions：方法执行登录验证。

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

问题：此代码位于我的AppDelegate.m中的应用程序didFinishLaunchingWithOptions：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 push rather than a modal transition to display the page. Since presentModalViewController method is deprecated or deleted in iOS7, how can I programmatically force a modal presentation?

它只是为登录的用户提供HTTP响应，并将它们带到我的TabBarController。问题是它使用推送而不是模态转换来显示页面。由于在iOS7中不推荐使用presentModalViewController方法，因此如何以编程方式强制进行模式演示？

EDIT: )

编辑:)

4 个解决方案

#1

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

旧的presentViewController：animated：方法已被弃用，我们需要使用presentViewController：animated：completion。您现在只需要在方法中添加一个完成参数 - 这应该有效：

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:animated tell you exactly what you need to know:

文档是一个很好的起点 - UIViewController presentViewController的文档：动画告诉你你需要知道的确切内容：

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.)

呈现由给定视图控制器管理给用户的模态视图。 （在iOS 6.0中不推荐使用。使用presentViewController：animated：completion：而不是。）

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

#2

Swift

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

由于接受的答案是在Objective-C中，因此您将在Swift中执行此操作。但是，与接受的答案不同，我的答案没有引用导航控制器。

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let secondViewController = storyboard.instantiateViewControllerWithIdentifier("secondViewControllerId") as! SecondViewController
self.presentViewController(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.

另请参见如何以编程方式关闭视图控制器。

#3

In Swift 3/4

在Swift 3/4中

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

#4

 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)