OC环境下：
1.先直接删除SceneDelegate.h/.m文件
2.在AppDelegate.h添加@property (strong, nonatomic) UIWindow * window;属性
#import
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow * window;
@end
3.移除UIScene代理
移除之前
#import "AppDelegate.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication*)applicationdidFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
// Override point for customization after application launch.
return YES;
}
#pragma mark - UISceneSession lifecycle
- (UISceneConfiguration *)application:(UIApplication *)application configurationForConnectingSceneSession:(UISceneSession *)connectingSceneSession options:(UISceneConnectionOptions *)options {
// Called when a new scene session is being created.
// Use this method to select a configuration to create the new scene with.
return [[UISceneConfiguration alloc] initWithName:@"Default Configuration" sessionRole:connectingSceneSession.role];
}
- (void)application:(UIApplication*)applicationdidDiscardSceneSessions:(NSSet *)sceneSessions {
// Called when the user discards a scene session.
// If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
// Use this method to release any resources that were specific to the discarded scenes, as they will not return.
}
@end
移除之后
#import "AppDelegate.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication*)applicationdidFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
// Override point for customization after application launch.
return YES;
}
@end
4.最后在info.plist文件中移除Application Scene Manifest
Swift环境下也是一样的：
1.先直接删除SceneDelegate.swift文件
2.在info.plist文件中删除Application scene manifest
3.删除AppDelegate中的两个方法
4.在Appdelegate中增加window属性
知识补充：SceneDelegate
Xcode 11 建新工程默认会创建通过 UIScene 管理多个 UIWindow 的应用，工程中除了 AppDelegate 外还会有一个 SceneDelegate，这是为了实现iPadOS支持多窗口的结果。如果仅开发iPhone应用而非iPad，那么该文件可放心地删除。
