获取window 添加到其上面

    // 获取根控制器

    UIWindow *rootWindow = [UIApplication sharedApplication].keyWindow;

 

    // 获取根控制器

    UIWindow *rootWindow = [UIApplication sharedApplication].keyWindow;

    

    UIColor *bjcolor = [UIColor colorWithWhite:0.5 alpha:0.5];

//    // 底部背景框

    _showbjView = InsertView(rootWindow, CGRectMake(0, 0, kScreenWidth, kAllHeight ), bjcolor);

    

    // 提示框