为 Mapbox xamarin 表单 IOS 信息窗口符号添加文本填充

问题描述

我在 Xamarin Forms 项目中使用 Naxam MapBox 项目。 单击标记并在信息窗口中有文本时，我能够生成一个弹出窗口。 在 Android 上，我可以通过传递一个 float[] 来将 Padding 添加到 IconTextFitPadding，这会一直在文本上添加漂亮的填充。但是在 IOS 中它会抛出异常。 “'Objective-C 异常抛出。名称：NSRangeException 原因：*** -[__NSArrayI objectAtIndexedSubscript:]：索引 4 超出范围 [0 .. 3]”

如果我只传递一个浮点值，那么它会在顶部添加填充并且不会抛出任何错误。

请在下面找到实现的代码。 我还包含了弹出窗口在 IOS 和 Android 上的外观图片。

private SymbolLayer GetLayerInfowWindow(CustomPinType pinType)
        {
            FormatEntry newLine = Expression.CreateFormatEntry("\n",FormatOption.FormatFontScale(0.5));
            FormatEntry feRegistration = Expression.CreateFormatEntry(
                Expression.Get("registration"),FormatOption.FormatFontScale(1.2),FormatOption.FormatTextColor(Color.Black),FormatOption.FormatTextFont(new[]
                {
                      "Arial Unicode MS Regular"
                })
            );
            FormatEntry feDateTime = Expression.CreateFormatEntry(
                Expression.Get("datetime"),FormatOption.FormatFontScale(1.0),FormatOption.FormatTextColor(Color.FromHex("#545252")),FormatOption.FormatTextFont(new[] {
                    "Arial Unicode MS Regular"
                })
            );
            FormatEntry feException = Expression.CreateFormatEntry(
                Expression.Get("exceptions"),FormatOption.FormatTextColor(Color.FromHex("#ee0000")),FormatOption.FormatTextFont(new[] {
                        "Arial Unicode MS Regular"
                })
            );
            FormatEntry feStart = Expression.CreateFormatEntry(
                Expression.Concat("Trip start"),FormatOption.FormatTextFont(new[] {
                       "Arial Unicode MS Regular"
                })
            );
            FormatEntry feEnd = Expression.CreateFormatEntry(
                Expression.Concat("Trip end"),FormatOption.FormatTextFont(new[] {
                       "Arial Unicode MS Regular"
                })
            );

            FormatEntry feSpeed = Expression.CreateFormatEntry(
                Expression.Concat("Max speed: ",Expression.Get("speed"),"km/h\r\n"),FormatOption.FormatTextFont(new[] {
                     "Arial Unicode MS Regular"
                })
            );



            string symbolName = pinType.ToString().ToLower();
            SymbolLayer symbol = new SymbolLayer($"layer.popup.{symbolName}.{PINSID}",$"source.{PINSID}")
            {
                Filter = Expression.All(
                    Expression.Eq(Expression.Get("selected"),Expression.Literal(true)),Expression.Eq(Expression.Get("pintype"),Expression.Literal(symbolName))
                ),IconAllowOverlap = Expression.Bool(false),IconPadding = 10,SymbolPlacement = "point",IconImage = $"image.infowindow",IconTextFit = "both",// scale balloon to text
                IconPitchAlignment = "viewport",// aligned to the plane of the viewport.
                IconAnchor = "bottom",IconKeepUpright = Expression.Bool(true),// flip with screen
                IconColor = Color.FromHex("FFFFFF"),Iconopacity = 1.0,// default is 1
                IconTextFitPadding = (new float[]
                {
                    5f,// top,10f,// right,15f,// bottom,10f      // left.
                }),IconOffset = (new float[] {
                    0f,// right
                    0f  // down
                }),// move anchor // right down
                IconTranslate = (new float[] {
                    0.0f,// right
                    -1.0f  // down
                }),TextSize = 16,TextPitchAlignment = "viewport",// aligned to the plane of the viewport.
                TextKeepUpright = Expression.Bool(true),// flip with screen
                TextAnchor = "bottom",TextJustify = "left",TextOpacity = 1.0,TextOffset = (new float[] {
                    0.0f,TextTranslate = (new float[] {
                    0.0f,0.0f
                }),TextAllowOverlap = Expression.Bool(false),IconIgnorePlacement = Expression.Bool(false),TextIgnorePlacement = Expression.Bool(false)
            };


            switch (pinType)
            {
                case (CustomPinType.TripStart):
                    symbol.TextField = Expression.Format(feRegistration,newLine,feDateTime,feStart);
                    break;
                case (CustomPinType.TripArrow):
                    symbol.TextField = Expression.Format(feRegistration,feSpeed);
                    break;
                case (CustomPinType.TripExceptionArrow):
                    symbol.TextField = Expression.Format(feRegistration,feSpeed,feException,newLine);
                    break;
                case (CustomPinType.TripEnd):
                    symbol.TextField = Expression.Format(feRegistration,feEnd);
                    break;
            }
            return symbol;
        }

解决方法

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