fix(ios): use different gesture tags

when there is more than one pie chart on the same page on iOS and the latest added pie chart slices get tapped the first pie chart's tap gesture handler gets triggered. this commit aims to fix this issue. (bar/line charts already have the logic that is added with this commit for pie and radar charts)

src/charting/charts/Chart.ts

@@ -1,4 +1,4 @@
-import { PanGestureHandlerOptions, PinchGestureHandlerOptions, TapGestureHandlerOptions } from '@nativescript-community/gesturehandler';
+import { PanGestureHandlerOptions, PinchGestureHandlerOptions, RotationGestureHandlerOptions, TapGestureHandlerOptions } from '@nativescript-community/gesturehandler';
 import { Align, Canvas, CanvasView, Paint } from '@nativescript-community/ui-canvas';
 import { EventData, Utils as NUtils, Trace } from '@nativescript/core';
 import { ChartAnimator, EasingFunction } from '../animation/ChartAnimator';
@@ -215,6 +215,7 @@ export abstract class Chart<U extends Entry, D extends IDataSet<U>, T extends Ch
     public tapGestureOptions: TapGestureHandlerOptions & { gestureTag?: number };
     public doubleTapGestureOptions: TapGestureHandlerOptions & { gestureTag?: number };
     public pinchGestureOptions: PinchGestureHandlerOptions & { gestureTag?: number };
+    public rotationGestureOptions: RotationGestureHandlerOptions & { gestureTag?: number };
 
     /**
      * Sets a new data object for the chart. The data object contains all values

src/charting/listener/PieRadarChartTouchListener.ts

@@ -5,6 +5,9 @@ import { Utils } from '../utils/Utils';
 import { ChartGesture, ChartTouchListener } from './ChartTouchListener';
 import { GestureHandlerStateEvent, GestureState, GestureStateEventData, HandlerType, Manager, RotationGestureHandler, TapGestureHandler } from '@nativescript-community/gesturehandler';
 
+let TAP_HANDLER_TAG = 11232000;
+let ROTATION_HANDLER_TAG = 11231000;
+
 /**
  * TouchListener for Pie- and RadarChart with handles all
  * touch interaction.
@@ -20,22 +23,35 @@ export class PieRadarChartTouchListener extends ChartTouchListener<PieRadarChart
      *
      * @param chart instance of the chart
      */
+    TAP_HANDLER_TAG;
+    ROTATION_HANDLER_TAG;
     constructor(chart: PieRadarChartBase<any, any, any>) {
         super(chart);
+        this.TAP_HANDLER_TAG = TAP_HANDLER_TAG++;
+        this.ROTATION_HANDLER_TAG = ROTATION_HANDLER_TAG++;
+    }
+
+    getTapGestureOptions() {
+        return { gestureTag: this.TAP_HANDLER_TAG, ...(this.mChart.tapGestureOptions || {}) };
+    }
+    getRotationGestureOptions() {
+        return { gestureTag: this.ROTATION_HANDLER_TAG, ...(this.mChart.rotationGestureOptions || {}) };
     }
 
     getOrCreateRotationGestureHandler() {
         if (!this.rotationGestureHandler) {
             const manager = Manager.getInstance();
-            this.rotationGestureHandler = manager.createGestureHandler(HandlerType.ROTATION, 11231, {}).on(GestureHandlerStateEvent, this.onRotationGesture, this);
+            const options = this.getRotationGestureOptions();
+            this.rotationGestureHandler = manager.createGestureHandler(HandlerType.ROTATION, options.gestureTag, {}).on(GestureHandlerStateEvent, this.onRotationGesture, this);
         }
         return this.rotationGestureHandler;
     }
 
     getOrCreateTapGestureHandler() {
         if (!this.tapGestureHandler) {
             const manager = Manager.getInstance();
-            this.tapGestureHandler = manager.createGestureHandler(HandlerType.TAP, 11232, {}).on(GestureHandlerStateEvent, this.onTapGesture, this);
+            const options = this.getTapGestureOptions();
+            this.tapGestureHandler = manager.createGestureHandler(HandlerType.TAP, options.gestureTag, {}).on(GestureHandlerStateEvent, this.onTapGesture, this);
         }
         return this.tapGestureHandler;
     }