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。
image.png
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
