Rim

Scale determines the structure of a circular gauge by using the circular rim. By setting the StartAngle and SweepAngle properties, you can change the shape of the circular gauge into a full circular gauge, half circular gauge, or quarter circular gauge.

The StartValue and EndValue properties will determine the overall range of the circular rim.

SFCircularGauge circularGauge = new SFCircularGauge();
            ObservableCollection<SFCircularScale> scales = new ObservableCollection<SFCircularScale>();
            SFCircularScale scale = new SFCircularScale();
            scale.StartAngle = -180;
            scale.SweepAngle = 180;
            scale.StartValue = 0;
            scale.EndValue = 360;
            scale.Interval = 20;
            scale.MinorTicksPerInterval = 0;
            scale.ShowFirstLabel = false;
            circularGauge.Scales.Add(scale);
            this.View.AddSubview(circularGauge);

Rim customization

The color and thickness of rim can be set by using the RimColor and RimWidth properties. To increase the RimWidth, set the RadiusFactor.

SFCircularGauge circularGauge = new SFCircularGauge();
            ObservableCollection<SFCircularScale> scales = new ObservableCollection<SFCircularScale>();
            SFCircularScale scale = new SFCircularScale();
            scale.StartValue = 0;
            scale.EndValue = 100;
            scale.RadiusFactor = 1;
            scale.RimWidth = 40;
            scale.LabelOffset = 0.6f;
            scale.MajorTickSettings.Offset = 0.8f;
            scale.MinorTickSettings.Offset = 0.8f;
            scale.RimColor = UIColor.FromRGB(135,206,250);
            circularGauge.Scales.Add(scale); 
            this.View.AddSubview(circularGauge);

Setting position for rim

You can customize the position of Scales in the following two ways:

RadiusFactor with the RimWidth property.
The ScaleStartOffset and ScaleEndOffset properties.

Setting radius factor for rim

SFCircularGauge circularGauge = new SFCircularGauge();
            ObservableCollection<SFCircularScale> scales = new ObservableCollection<SFCircularScale>();
            SFCircularScale scale = new SFCircularScale();
            scale.StartValue = 0;
            scale.EndValue = 100;
            scale.RadiusFactor = 0.7f;
            scale.RimWidth = 30;
            circularGauge.Scales.Add(scale); 
            this.View.AddSubview(circularGauge);

Setting scale start and end offsets for rim

SFCircularGauge circularGauge = new SFCircularGauge();
            ObservableCollection<SFCircularScale> scales = new ObservableCollection<SFCircularScale>();
            SFCircularScale scale = new SFCircularScale();
            scale.StartValue = 0;
            scale.EndValue = 100;
            scale.ScaleStartOffset = 0.6f;
            scale.ScaleEndOffSet = 0.7f;
            circularGauge.Scales.Add(scale); 
            this.View.AddSubview(circularGauge);

Show rim

The ShowRim property is a Boolean property, which is used to enable or disable the rim in circular gauge.

SFCircularGauge circularGauge = new SFCircularGauge();
            ObservableCollection<SFCircularScale> scales = new ObservableCollection<SFCircularScale>();
            SFCircularScale scale = new SFCircularScale();
            scale.StartValue = 0;
            scale.EndValue = 100;
            scale.ShowRim = false;
            circularGauge.Scales.Add(scale); 
            this.View.AddSubview(circularGauge);