【Xamarin學習筆記】Xamarin.iOS中隱藏和顯示Tabbar

原文地址：http://stackoverflow.com/a/16242104

相關討論：http://forums.xamarin.com/discussion/12103/how-would-you-approach-auto-hide-show-of-tab-bar

NO.1

public void HideTabBar()
{
    var screenRect = UIScreen.MainScreen.Bounds;
    float fHeight = screenRect.Height;
    if(UIApplication.SharedApplication.StatusBarOrientation == UIInterfaceOrientation.LandscapeLeft
       || UIApplication.SharedApplication.StatusBarOrientation == UIInterfaceOrientation.LandscapeRight)
    {
        fHeight = screenRect.Width;
    }

    UIView.BeginAnimations(null);
    UIView.SetAnimationDuration(0.4);
    foreach(UIView view in this.View.Subviews)
    {
        if(view is UITabBar)
        {
            view.Frame = new RectangleF(view.Frame.X, fHeight, view.Frame.Width, view.Frame.Height);
        } 
        else 
        {
            view.Frame = new RectangleF(view.Frame.X, view.Frame.Y, view.Frame.Width, fHeight);
            view.BackgroundColor = UIColor.Black;
        }
    }
    UIView.CommitAnimations();
}

public void ShowTabBar()
{   
    var screenRect = UIScreen.MainScreen.Bounds;
    float fHeight = screenRect.Height - 49f;
    if(UIApplication.SharedApplication.StatusBarOrientation == UIInterfaceOrientation.LandscapeLeft
       || UIApplication.SharedApplication.StatusBarOrientation == UIInterfaceOrientation.LandscapeRight)
    {
        fHeight = screenRect.Width - 49f;
    }

    UIView.BeginAnimations(null);
    UIView.SetAnimationDuration(0.4);
    foreach(UIView view in this.View.Subviews)
    {
        if(view is UITabBar)
        {
            view.Frame = new RectangleF(view.Frame.X, fHeight, view.Frame.Width, view.Frame.Height);
        } 
        else 
        {
            view.Frame = new RectangleF(view.Frame.X, view.Frame.Y, view.Frame.Width, fHeight);
        }
    }
    UIView.CommitAnimations();
}

No.2

地址：http://forums.xamarin.com/discussion/20901/hide-tab-bar-on-push

bool _isHidden;

public void HideTabBar()
{
    if (_isHidden)
        return;

    var screenRect = UIScreen.MainScreen.Bounds;
    var height = screenRect.Height;

    if(UIApplication.SharedApplication.StatusBarOrientation == UIInterfaceOrientation.LandscapeLeft
        || UIApplication.SharedApplication.StatusBarOrientation == UIInterfaceOrientation.LandscapeRight)
    {
        height = screenRect.Width;
    }

    UIView.BeginAnimations(null);
    UIView.SetAnimationDuration(0.4);

    foreach(UIView view in this.View.Subviews)
    {
        if(view is UITabBar)
            view.Frame = new CGRect(view.Frame.X, height, view.Frame.Width, view.Frame.Height);
        else 
        {
            view.Frame = new CGRect(view.Frame.X, view.Frame.Y, view.Frame.Width, height);
            view.BackgroundColor = UIColor.Black;
        }
    }

    UIView.CommitAnimations();

    _isHidden = true;
}

public void ShowTabBar()
{
    if (!_isHidden)
        return;

    var screenRect = UIScreen.MainScreen.Bounds;
    var height = screenRect.Height - 49f;

    if(UIApplication.SharedApplication.StatusBarOrientation == UIInterfaceOrientation.LandscapeLeft
        || UIApplication.SharedApplication.StatusBarOrientation == UIInterfaceOrientation.LandscapeRight)
    {
        height = screenRect.Width - 49f;
    }

    UIView.BeginAnimations(null);
    UIView.SetAnimationDuration(0.4);

    foreach(UIView view in this.View.Subviews)
    {
        if(view is UITabBar)
            view.Frame = new CGRect(view.Frame.X, height, view.Frame.Width, view.Frame.Height);
        else 
            view.Frame = new CGRect(view.Frame.X, view.Frame.Y, view.Frame.Width, height);
    }

    UIView.CommitAnimations();

    _isHidden = false;
}