//tabbar item在各個樣式的下的布局
    
    //上下結構tabbar item布局
    UITabBarItemAppearance *stack_apperance = [[UITabBarItemAppearance alloc] initWithStyle:UITabBarItemAppearanceStyleStacked];
    stack_apperance.normal.titlePositionAdjustment = UIOffsetMake(0, 1);
    stack_apperance.selected.titlePositionAdjustment = UIOffsetMake(0, 1);
    stack_apperance.normal.titleTextAttributes = @{NSForegroundColorAttributeName: color, NSFontAttributeName:UIFont.bb_12};
    stack_apperance.selected.titleTextAttributes = @{NSForegroundColorAttributeName: scolor, NSFontAttributeName:UIFont.bb_12};
    
    //左右結構tabbar item布局（左右結構時字體一定要比上下布局小，否則會由于間隔問題導致文字顯示不全）
    UITabBarItemAppearance *inline_apperance = [[UITabBarItemAppearance alloc] initWithStyle:UITabBarItemAppearanceStyleInline];
    inline_apperance.normal.titleTextAttributes = @{NSForegroundColorAttributeName: color, NSFontAttributeName:UIFont.bb_10};
    inline_apperance.selected.titleTextAttributes = @{NSForegroundColorAttributeName: scolor, NSFontAttributeName:UIFont.bb_10};
    
    //左右結構被擠壓時的tabbar item布局（某些特殊情況，只會出現在ipad上，比如多屏側邊欄出現時會壓縮app的寬度）
    UITabBarItemAppearance *compact_apperance = [[UITabBarItemAppearance alloc] initWithStyle:UITabBarItemAppearanceStyleCompactInline];
    compact_apperance.normal.titleTextAttributes = @{NSForegroundColorAttributeName: color, NSFontAttributeName:UIFont.bb_7};
    compact_apperance.selected.titleTextAttributes = @{NSForegroundColorAttributeName: scolor, NSFontAttributeName:UIFont.bb_7};
    

    //tabbar item樣式類
    UITabBarAppearance *bar_a = [UITabBarAppearance new];
    bar_a.stackedLayoutAppearance = stack_apperance;
    bar_a.inlineLayoutAppearance = inline_apperance;
    bar_a.compactInlineLayoutAppearance = compact_apperance;
    
    //tabbar item
    UITabBarItem *tab = [[UITabBarItem alloc] initWithTitle:title image:icon selectedImage:sicon];
    tab.imageInsets = UIEdgeInsetsZero;
    tab.standardAppearance = bar_a;
    tab.scrollEdgeAppearance = bar_a;