原理：在iOS RootViewController 構建視圖的時候添加一個啟動圖，然後在main.js加載場景後將其移出

1、RootViewController.mm 修改如下代碼

- (void)viewWillAppear:(BOOL)animated {

[super viewWillAppear:animated];

CGRect bounds = [[UIScreen mainScreen] bounds];

UIImageView *backView = [[UIImageView alloc] initWithFrame: bounds];

UIImage *ima = [UIImage imageNamed:@"xxxxxxx.png"];

[backView setImage:ima];

[self.view addSubview:backView];

}

+(void)removeBackLuanch{

UIViewController *rootVC = [[UIApplication sharedApplication].delegate window].rootViewController;

for(UIView* subview in rootVC.view.subviews){

if([subview isKindOfClass:[UIImageView class

[subview removeFromSuperview];

}

}

}

2、main.js 在第一個場景加載完成後，將其移出

jsb.reflection.callStaticMethod("RootViewController", "removeBackLuanch");

creator iOS 啟動第一個場景前的短暫黑屏