XCode11新增SceneDelegate

新情况

更新到XCode11之后，老项目没关系，但是新建项目，和以前完全不一样了。增加了SceneDelegate，据说是为了iPad的多进程准备的。

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AppDelegate.m中增加了关于SceneDelegate的函数。

#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 *)application didDiscardSceneSessions:(NSSet<UISceneSession *> *)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.
}

去掉不需要的SceneDelegate

如果没有多进程需求，那么还是去掉这个多余的SceneDelegate比较好。

• 直接删除SceneDelegate文件，包括.h,.m

• 删除info.plist中的Application Scene Manifest选项

• 删除AppDelegate.m中关于SceneDelegate的函数。

• 在AppDelegate.h中添加window属性

@property (strong, nonatomic) UIWindow *window;

没有window属性，会导致黑屏

• 设置最低支持版本，比如9.0；最好不要用8.0，太低了，有未知的问题。

image.png

多进程等以后成熟了再说，并且最低支持版本最好是iOS13