iOS截取LaunchScreen.storyboard图片

注意：控件不要使用SafeArea约束，不然获取的快照内容不准确

Swift

    private func launchScreenSnapshort() -> UIImage? {
        guard let info_dict = Bundle.main.infoDictionary,
              let storyboard_name = info_dict["UILaunchStoryboardName"] as? String,
              let storyboard_vc = UIStoryboard.init(name: storyboard_name, bundle: nil).instantiateInitialViewController(),
              let storyboard_view = storyboard_vc.view else {
                  return nil
              }
        let size = storyboard_view.bounds.size
        UIGraphicsBeginImageContextWithOptions(size, false, UIScreen.main.scale)
        let ctx = UIGraphicsGetCurrentContext()
        storyboard_view.layer.render(in: ctx!)
        let lauch_image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return lauch_image
    }

Objective-C

- (UIImage *)imageFromLaunchScreen {
    NSString *UILaunchStoryboardName = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchStoryboardName"];
    if (UILaunchStoryboardName == nil) {
        NSLog(@"从 LaunchScreen 中获取启动图失败!");
        return nil;
    }
    UIViewController *LaunchScreenSb = [[UIStoryboard storyboardWithName:UILaunchStoryboardName bundle:nil] instantiateInitialViewController];
    if (LaunchScreenSb) {
        UIView * view = LaunchScreenSb.view;
        // 加入到UIWindow后，LaunchScreenSb.view的safeAreaInsets在刘海屏机型才正常。
        UIWindow *containerWindow = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
        view.frame = containerWindow.bounds;
        [containerWindow addSubview:view];
        [containerWindow layoutIfNeeded];
        UIImage *image = [self imageFromView:view];
        containerWindow = nil;
        return image;
    }
    NSLog(@"从 LaunchScreen 中获取启动图失败!");
    return nil;
}

-(UIImage *)imageFromView:(UIView*)view {
    //fix bug:https://github.com/CoderZhuXH/XHLaunchAd/issues/203
    if (CGRectIsEmpty(view.frame)) {
        return nil;
    }
    CGSize size = view.bounds.size;
    //参数1:表示区域大小 参数2:如果需要显示半透明效果,需要传NO,否则传YES 参数3:屏幕密度
    UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);
    if ([view respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]) {
        [view drawViewHierarchyInRect:view.bounds afterScreenUpdates:YES];
    }else{
        [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    }
    UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}