[英]How to get rootViewController in iOS 13 using Objective-C?
I'm trying to get the rootViewController
in iOS 13 using Objective-C.我正在尝试使用 Objective-C 获取
rootViewController
13 中的 rootViewController。 I'm doing something like this:我正在做这样的事情:
for (UIScene *scene in UIApplication.sharedApplication.connectedScenes) {
UIWindowScene *windowScene = (UIWindowScene *) scene;
UIWindowSceneDelegate *windowSceneDelegate = (UIWindowSceneDelegate *) windowScene.delegate;
windowSceneDelegate.window = ...
}
But when I try to access the window
property in windowSceneDelegate.window =
(to get the rootViewController
) I get the following error:但是当我尝试访问 windowSceneDelegate.window = 中的
window
属性时windowSceneDelegate.window =
(获取rootViewController
)我收到以下错误:
Property 'window' cannot be found in forward class object 'UIWindowSceneDelegate'
在前向 class object 'UIWindowSceneDelegate' 中找不到属性“窗口”
But when I go to the definition of UIWindowSceneDelegate
, I see a window
property:但是当我 go 定义
UIWindowSceneDelegate
时,我看到了window
属性:
So what is the right way get rootViewController in iOS 13 using Objective-C?那么使用 Objective-C 在 iOS 13 中获取 rootViewController 的正确方法是什么?
Change your code to:将您的代码更改为:
for (UIScene *scene in UIApplication.sharedApplication.connectedScenes) {
if ([scene.delegate conformsToProtocol:@protocol(UIWindowSceneDelegate)]) {
UIWindow *window = [(id<UIWindowSceneDelegate>)scene.delegate window];
}
}
When you open the UIKit
s UIWindowScene.h
header file, it contains:当您打开
UIKit
s UIWindowScene.h
header 文件时,它包含:
@class UIScreen, UIWindow, UIWindowSceneDelegate, UISceneDestructionRequestOptions, CKShareMetadata, UISceneSizeRestrictions;
See, there's the UIWindowSceneDelegate
.看,有
UIWindowSceneDelegate
。 This is the forward declaration.这是前向声明。
Read this answer to learn what the forward declaration is.阅读此答案以了解前向声明是什么。
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