Liuhaiping's mobile phone passes [[uiapplication sharedapplication] delegate] window. safeAreaInsets. The height of the bottom security zone is 0

Liuhaiping's mobile phone passes through... On some pages [[UIApplication sharedApplication] delegate].window.safeAreaInsets.bottom The height of the bottom safety zone is 0 problem , How to solve ？
If we are in the player SelVideoPlayer The height of the safety zone at the bottom of the liuhaiping mobile phone is obtained in 0, My top safety zone is also 0. As such, the following definitions ：

#define kMainTopHeight ({
       float space = 64.0; if (@available(iOS 11.0, *)) space = ([[UIApplication sharedApplication] delegate].window.safeAreaInsets.top+44); (space); })
#define kMainBottomHeight ({
       float space = 49.0; if (@available(iOS 11.0, *)) space = ([[UIApplication sharedApplication] delegate].window.safeAreaInsets.bottom + 49); (space); })

The analysis reason should be the problem of the window . Then how to solve it ？
It can be retrieved by keyWindow To find the bottom safety height and the top safety zone height correctly .

#define Base_BottomHeight ([FMConfig config].safeBottomHeight)
//  Height of bottom safety zone 
#define BR_BOTTOM_MARGIN \ ({
      CGFloat safeBottomHeight = 0;\ if (@available(iOS 11.0, *)) {
      \ safeBottomHeight = BRGetKeyWindow().safeAreaInsets.bottom;\ }\ (safeBottomHeight);})


/**  obtain  keyWindow */
static inline UIWindow *BRGetKeyWindow(void) {
    
    UIWindow *keyWindow = nil;
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000 //  Compile time check SDK edition ：Xcode11+ Compilation will call （iOS SDK 13.0  Processing of later versions ）
    if (@available(iOS 13.0, *)) {
    
        NSSet<UIScene *> *connectedScenes = [UIApplication sharedApplication].connectedScenes;
        for (UIScene *scene in connectedScenes) {
    
            if (scene.activationState == UISceneActivationStateForegroundActive && [scene isKindOfClass:[UIWindowScene class]]) {
    
                UIWindowScene *windowScene = (UIWindowScene *)scene;
                for (UIWindow *window in windowScene.windows) {
    
                    if (window.isKeyWindow) {
    
                        keyWindow = window;
                        break;
                    }
                }
            }
        }
    } else
#endif
    {
    
#if __IPHONE_OS_VERSION_MIN_REQUIRED < 130000
        return [UIApplication sharedApplication].keyWindow;
#endif
    }
    
    return keyWindow;
}