从自定义类显示alertController [英] show alertController from a custom class

问题描述

我正在尝试显示我所制作的类中的AlertController。
因为AlertController是UIResponder的子类，所以我使用Xcode向我建议的以下代码行

I'm trying to show an AlertController from a class that I've made. Since AlertController is a subclass of UIResponder I'm using the following line of code that Xcode is suggesting me

superclass?.presentViewController(alertController, animated: true, completion: nil)

但是我无法编译，因为AnyClass吗？没有任何成员presentViewController。
我的类是NSObject的子类。

But I cannot compile because AnyClass? does not have any member presentViewController. My class is a subclass of NSObject.

还有其他解决方案吗？
谢谢

Any other solution? Thanks

推荐答案

好吧，您只需要找到最顶层的视图控制器并显示 alertcontroller 。

Well you just need to find the topmost view controller and present the alertcontroller from there.

UIViewController *topController = [UIApplication sharedApplication].keyWindow.rootViewController;

while (topController.presentedViewController) {
    topController = topController.presentedViewController;
}
[topController presentViewController:alertController animated:YES completion:nil];

积分

注意：这是该代码的Objective-C版本。

Note: This is objective-c version of the code. Kindly convert it to swift accordingly.

SWIFT

let topController = UIApplication.sharedApplication().keyWindow!.rootViewController as UIViewController

while (topController.presentedViewController) {
    topController = topController.presentedViewController;
}
topController.presentViewController(alertController, animated:true, completion:nil)

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