问题

我开始看看Swift编程语言,不知为何我不能正确地从特定的UIStoryboard输入一个UIViewController的初始化。

在Objective-C中,我简单地写:

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"StoryboardName" bundle:nil];
UIViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"ViewControllerID"];
[self presentViewController:viewController animated:YES completion:nil];

有人能帮助我如何在斯威夫特上实现这一点吗?


当前回答

如果你有一个Viewcontroller没有使用任何storyboard/Xib,你可以像下面这样调用这个特定的VC:

 let vcInstance : UIViewController   = yourViewController()
 self.present(vcInstance, animated: true, completion: nil)

其他回答

如果你想以模态方式呈现它,你应该有如下所示的东西:

let vc = self.storyboard!.instantiateViewControllerWithIdentifier("YourViewControllerID")
self.showDetailViewController(vc as! YourViewControllerClassName, sender: self)

这个链接有两个实现:

迅速:

let viewController:UIViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("ViewController") as UIViewController
self.presentViewController(viewController, animated: false, completion: nil)

Objective - C

UIViewController *viewController = [[UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil] instantiateViewControllerWithIdentifier:@"ViewController"];

这个链接有在同一个故事板中初始化视图控制器的代码

/*
 Helper to Switch the View based on StoryBoard
 @param StoryBoard ID  as String
*/
func switchToViewController(identifier: String) {
    let viewController = self.storyboard?.instantiateViewControllerWithIdentifier(identifier) as! UIViewController
    self.navigationController?.setViewControllers([viewController], animated: false)

}

我创建了一个库,可以用更好的语法更容易地处理这个问题:

https://github.com/Jasperav/Storyboardable

只需改变Storyboard.swift,让ViewControllers符合Storyboardable。

if let destinationVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "DestinationVC") as? DestinationVC{
            let nav = self.navigationController
            //presenting
            nav?.present(destinationVC, animated: true, completion: {
                
            })
            //push
            nav?.pushViewController(destinationVC, animated: true)
        }

对于那些使用@akashivsky的答案来实例化UIViewController的人来说,有一个异常:

致命错误:类使用了未实现的初始化式'init(coder:)'

快速提示:

手动实现所需的初始化?(coder aDecoder: NSCoder)在你的目标UIViewController,你试图实例化

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

如果你需要更多的描述,请参考我在这里的回答