protected override void Render()
{
// Icon & Content
if (Element.Icon != null)
{
switch (Element.Icon)
{
case BitmapIcon bitmap:
Native.Image = UIImageHelper.FromUri(bitmap.UriSource);
Native.CustomView = null;
Native.Title = null;
break;
case FontIcon font: // not supported
case PathIcon path: // not supported
case SymbolIcon symbol: // not supported
default:
this.Log().WarnIfEnabled(() => $"{GetType().Name ?? "FontIcon, PathIcon and SymbolIcon"} are not supported. Use BitmapIcon instead with UriSource.");
Native.Image = null;
Native.CustomView = null;
// iOS doesn't add the UIBarButtonItem to the native logical tree unless it has an Image or Title set.
// We default to an empty string to ensure it is added.
Native.Title = string.Empty;
break;
}
}
else
{
switch (Element.Content)
{
case string text:
Native.Image = null;
Native.CustomView = null;
Native.Title = text;
break;
case FrameworkElement fe:
var currentParent = Element.GetParent();
_appBarButtonWrapper.Child = Element;
//Restore the original parent if any, as we
// want the DataContext to flow properly from the
// CommandBar.
Element.SetParent(currentParent);
Native.Image = null;
Native.CustomView = fe.Visibility == Visibility.Visible ? _appBarButtonWrapper : null;
// iOS doesn't add the UIBarButtonItem to the native logical tree unless it has an Image or Title set.
// We default to an empty string to ensure it is added, in order to support late-bound Content.
Native.Title = string.Empty;
break;
default:
Native.Image = null;
Native.CustomView = null;
// iOS doesn't add the UIBarButtonItem to the native logical tree unless it has an Image or Title set.
// We default to an empty string to ensure it is added.
Native.Title = string.Empty;
break;
}
}
// Label
Native.AccessibilityHint = Element.Label;
Native.AccessibilityLabel = Element.Label;
// Foreground
if (Element.Foreground is SolidColorBrush foreground)
{
var color = (UIColor)foreground.Color as UIColor;
var alpha = (nfloat)(foreground.Opacity * Element.Opacity);
Native.TintColor = color.ColorWithAlpha(alpha);
}
else
{
Native.TintColor = default(UIColor); // TODO .Clear;
}
// IsEnabled
Native.Enabled = Element.IsEnabled;
// Background
var backgroundColor = (Element.Background as SolidColorBrush)?.ColorWithOpacity;
if (backgroundColor != null)
{
if (HasContent)
{
// Setup the background color when a custom content is set.
_appBarButtonWrapper.BackgroundColor = backgroundColor;
}
else
{
var isTransparent = backgroundColor.Value.A == 0;
var backgroundImage = isTransparent
? new UIImage() // Clears the background
: ((UIColor)backgroundColor).ToUIImage(); // Applies the solid color;
// We're using SetBackgroundImage instead of SetBackgroundColor
// because it extends all the way up under the status bar.
Native.SetBackgroundImage(backgroundImage, UIControlState.Normal, UIBarMetrics.Default);
}
}
}
protected override void Render()
{
ApplyVisibility();
// Foreground
if (Brush.TryGetColorWithOpacity(Element.Foreground, out var foregroundColor))
{
Native.TitleTextAttributes = new UIStringAttributes
{
ForegroundColor = foregroundColor,
};
}
else
{
Native.TitleTextAttributes = null;
}
// Background
var backgroundColor = Brush.GetColorWithOpacity(Element.Background);
switch (backgroundColor)
{
case Color opaqueColor when opaqueColor.A == byte.MaxValue:
// Prefer BarTintColor because it supports smooth transitions
Native.BarTintColor = opaqueColor;
Native.Translucent = false; //Make fully opaque for consistency with SetBackgroundImage
Native.SetBackgroundImage(null, UIBarMetrics.Default);
Native.ShadowImage = null;
break;
case Color semiTransparentColor when semiTransparentColor.A > 0:
Native.BarTintColor = null;
// Use SetBackgroundImage as hack to support semi-transparent background
Native.SetBackgroundImage(((UIColor)semiTransparentColor).ToUIImage(), UIBarMetrics.Default);
Native.Translucent = true;
Native.ShadowImage = null;
break;
case Color transparent when transparent.A == 0:
Native.BarTintColor = null;
Native.SetBackgroundImage(new UIImage(), UIBarMetrics.Default);
// We make sure a transparent bar doesn't cast a shadow.
Native.ShadowImage = new UIImage(); // Removes the default 1px line
Native.Translucent = true;
break;
default: //Background is null
Native.BarTintColor = null;
Native.SetBackgroundImage(null, UIBarMetrics.Default); // Restores the default blurry background
Native.ShadowImage = null; // Restores the default 1px line
Native.Translucent = true;
break;
}
// CommandBarExtensions.BackButtonForeground
var backButtonForeground = Brush.GetColorWithOpacity(Element.GetValue(BackButtonForegroundProperty) as Brush);
Native.TintColor = backButtonForeground;
// CommandBarExtensions.BackButtonIcon
var backButtonIcon = Element.GetValue(BackButtonIconProperty) is BitmapIcon bitmapIcon
? UIImageHelper.FromUri(bitmapIcon.UriSource)
: null;
Native.BackIndicatorImage = backButtonIcon;
Native.BackIndicatorTransitionMaskImage = backButtonIcon;
if (Element.Presenter != null)
{
Element.Presenter.Height = Native.Hidden ? 0 : Native.Frame.Size.Height;
}
}
protected override void Render()
{
ApplyVisibility();
var appearance = new UINavigationBarAppearance();
// Background
var backgroundColor = Brush.GetColorWithOpacity(Element.Background);
switch (backgroundColor)
{
case { } opaqueColor when opaqueColor.A == byte.MaxValue:
if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
{
appearance.ConfigureWithOpaqueBackground();
appearance.BackgroundColor = opaqueColor;
}
else
{
// Prefer BarTintColor because it supports smooth transitions
Native.BarTintColor = opaqueColor;
Native.Translucent = false; //Make fully opaque for consistency with SetBackgroundImage
Native.SetBackgroundImage(null, UIBarMetrics.Default);
Native.ShadowImage = null;
}
break;
case { } semiTransparentColor when semiTransparentColor.A > 0:
if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
{
appearance.ConfigureWithDefaultBackground();
appearance.BackgroundColor = semiTransparentColor;
}
else
{
Native.BarTintColor = null;
// Use SetBackgroundImage as hack to support semi-transparent background
Native.SetBackgroundImage(((UIColor)semiTransparentColor).ToUIImage(), UIBarMetrics.Default);
Native.Translucent = true;
Native.ShadowImage = null;
}
break;
case { } transparent when transparent.A == 0:
if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
{
appearance.ConfigureWithTransparentBackground();
appearance.BackgroundColor = transparent;
}
else
{
Native.BarTintColor = null;
Native.SetBackgroundImage(new UIImage(), UIBarMetrics.Default);
// We make sure a transparent bar doesn't cast a shadow.
Native.ShadowImage = new UIImage(); // Removes the default 1px line
Native.Translucent = true;
}
break;
default: //Background is null
if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
{
appearance.ConfigureWithDefaultBackground();
appearance.BackgroundColor = null;
}
else
{
Native.BarTintColor = null;
Native.SetBackgroundImage(null, UIBarMetrics.Default); // Restores the default blurry background
Native.ShadowImage = null; // Restores the default 1px line
Native.Translucent = true;
}
break;
}
// Foreground
if (Brush.TryGetColorWithOpacity(Element.Foreground, out var foregroundColor))
{
if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
{
appearance.TitleTextAttributes = new UIStringAttributes
{
ForegroundColor = foregroundColor,
};
appearance.LargeTitleTextAttributes = new UIStringAttributes
{
ForegroundColor = foregroundColor,
};
}
else
{
Native.TitleTextAttributes = new UIStringAttributes
{
ForegroundColor = foregroundColor,
};
}
}
else
{
if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
{
appearance.TitleTextAttributes = new UIStringAttributes();
appearance.LargeTitleTextAttributes = new UIStringAttributes();
}
else
{
Native.TitleTextAttributes = null;
}
}
// CommandBarExtensions.BackButtonForeground
var backButtonForeground = Brush.GetColorWithOpacity(Element.GetValue(BackButtonForegroundProperty) as Brush);
Native.TintColor = backButtonForeground;
// CommandBarExtensions.BackButtonIcon
var backButtonIcon = Element.GetValue(BackButtonIconProperty) is BitmapIcon bitmapIcon
? UIImageHelper.FromUri(bitmapIcon.UriSource)?.ImageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
: null;
if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
{
var backButtonAppearance = new UIBarButtonItemAppearance(UIBarButtonItemStyle.Plain);
if (backButtonForeground is { } foreground)
{
var titleTextAttributes = new UIStringAttributes
{
ForegroundColor = foreground
};
var attributes = new NSDictionary <NSString, NSObject>(
new NSString[] { titleTextAttributes.Dictionary.Keys[0] as NSString }, titleTextAttributes.Dictionary.Values
);
backButtonAppearance.Normal.TitleTextAttributes = attributes;
backButtonAppearance.Highlighted.TitleTextAttributes = attributes;
if (backButtonIcon is { } image)
{
var tintedImage = image.ApplyTintColor(foreground);
appearance.SetBackIndicatorImage(tintedImage, tintedImage);
}
}
else
{
if (backButtonIcon is { } image)
{
appearance.SetBackIndicatorImage(image, image);
}
}
appearance.BackButtonAppearance = backButtonAppearance;
}