如何在tabbar Xamarin表单IOS中设置保证金？

Question

我正在使用Xamarin表单并创建标签页。在IOS中我想增加tabbar的高度，所以在tab标题的底部显示一些空格。我该如何设置？

我尝试过以下代码，但没有用。在底部设置保证金的任何其他方式？ ：

public class BottomTabbedPage : TabbedRenderer
{
    private readonly float tabBarHeight = 72f;
    public override void ViewWillAppear(bool animated)
    {
        base.ViewWillAppear(animated);
        TabBar.UnselectedItemTintColor = UIColor.FromRGB(208,208,208);
        TabBar.BackgroundColor = UIColor.White;
        TabBar.Frame = new CGRect(TabBar.Frame.X, TabBar.Frame.Y + (TabBar.Frame.Height - tabBarHeight), TabBar.Frame.Width, tabBarHeight);            
    }
}

Answer 1

您应该将以下代码放在事件ViewWillLayoutSubviews()：

中

private readonly float tabBarHeight = 72f;

public override void ViewWillLayoutSubviews()
{
    base.ViewWillLayoutSubviews();

    CGRect tabFrame = TabBar.Frame;
    tabFrame.Height = tabBarHeight;
    tabFrame.Y = View.Frame.Height - tabBarHeight;

    TabBar.Frame = tabFrame;          
}

修改

如果您想调整图标和标题的位置，请使用：

foreach (UIViewController vc in ViewControllers)
{
    //Adjust the title's position   
    vc.TabBarItem.TitlePositionAdjustment = new UIOffset(0, -36);
    //Adjust the icon's position
    vc.TabBarItem.ImageInsets = new UIEdgeInsets(-36, 0, 36, 0);
}