Ecco la mia opinione sulla risposta di Jonathan. Per Xamarin.iOS (C #), ma con correzioni per il dimensionamento delle immagini. Come per il commento di Cœur sulla risposta di Colin Blake, ho creato tutte le immagini tranne il divisore della dimensione del controllo segmentato. Il divisore è 1 x altezza del segmento.
public static UIImage ImageWithColor(UIColor color, CGSize size)
{
var rect = new CGRect(0, 0, size.Width, size.Height);
UIGraphics.BeginImageContext(rect.Size);
var context = UIGraphics.GetCurrentContext();
context.SetFillColor(color.CGColor);
context.FillRect(rect);
var image = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
return image;
}
// https://stackoverflow.com/a/56465501/420175
public static void ColorSegmentiOS13(UISegmentedControl uis, UIColor tintColor, UIColor textSelectedColor, UIColor textDeselectedColor)
{
if (!UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
{
return;
}
UIImage image(UIColor color)
{
return ImageWithColor(color, uis.Frame.Size);
}
UIImage imageDivider(UIColor color)
{
return ImageWithColor(color, 1, uis.Frame.Height);
}
// Must set the background image for normal to something (even clear) else the rest won't work
//setBackgroundImage(UIImage(color: backgroundColor ?? .clear), for: .normal, barMetrics: .default)
uis.SetBackgroundImage(image(UIColor.Clear), UIControlState.Normal, UIBarMetrics.Default);
// setBackgroundImage(tintColorImage, for: .selected, barMetrics: .default)
uis.SetBackgroundImage(image(tintColor), UIControlState.Selected, UIBarMetrics.Default);
// setBackgroundImage(UIImage(color: tintColor.withAlphaComponent(0.2)), for: .highlighted, barMetrics: .default)
uis.SetBackgroundImage(image(tintColor.ColorWithAlpha(0.2f)), UIControlState.Highlighted, UIBarMetrics.Default);
// setBackgroundImage(tintColorImage, for: [.highlighted, .selected], barMetrics: .default)
uis.SetBackgroundImage(image(tintColor), UIControlState.Highlighted | UIControlState.Selected, UIBarMetrics.Default);
// setTitleTextAttributes([.foregroundColor: tintColor, NSAttributedString.Key.font: UIFont.systemFont(ofSize: 13, weight: .regular)], for: .normal)
// Change: support distinct color for selected/de-selected; keep original font
uis.SetTitleTextAttributes(new UITextAttributes() { TextColor = textDeselectedColor }, UIControlState.Normal); //Font = UIFont.SystemFontOfSize(13, UIFontWeight.Regular)
uis.SetTitleTextAttributes(new UITextAttributes() { TextColor = textSelectedColor, }, UIControlState.Selected); //Font = UIFont.SystemFontOfSize(13, UIFontWeight.Regular)
// setDividerImage(tintColorImage, forLeftSegmentState: .normal, rightSegmentState: .normal, barMetrics: .default)
uis.SetDividerImage(imageDivider(tintColor), UIControlState.Normal, UIControlState.Normal, UIBarMetrics.Default);
//layer.borderWidth = 1
uis.Layer.BorderWidth = 1;
//layer.borderColor = tintColor.cgColor
uis.Layer.BorderColor = tintColor.CGColor;
}