fix(ios): gesture touch event coordinates improvements (#8998)

SergeyMell · NathanWalker · commit fe46afbcbca1 · 2021-02-27T11:36:17.000-08:00
diff --git a/packages/core/ui/gestures/index.ios.ts b/packages/core/ui/gestures/index.ios.ts
@@ -601,10 +601,14 @@ class TouchGestureEventData implements TouchGestureEventData {
 	}
 
 	getX(): number {
-		return this.getMainPointer().locationInView(this.view.nativeViewProtected).x;
+		const offset = this.view.nativeViewProtected.contentOffset;
+		const offsetX = offset ? offset.x : 0;
+		return this.getMainPointer().locationInView(this.view.nativeViewProtected).x - offsetX;
 	}
 
 	getY(): number {
-		return this.getMainPointer().locationInView(this.view.nativeViewProtected).y;
+		const offset = this.view.nativeViewProtected.contentOffset;
+		const offsetY = offset ? offset.y : 0;
+		return this.getMainPointer().locationInView(this.view.nativeViewProtected).y - offsetY;
 	}
 }

Original file line number	Diff line number	Diff line change
`@@ -601,10 +601,14 @@ class TouchGestureEventData implements TouchGestureEventData {`
`601`	`601`	`}`
`602`	`602`
`603`	`603`	`getX(): number {`
`604`		`- return this.getMainPointer().locationInView(this.view.nativeViewProtected).x;`
	`604`	`+ const offset = this.view.nativeViewProtected.contentOffset;`
	`605`	`+ const offsetX = offset ? offset.x : 0;`
	`606`	`+ return this.getMainPointer().locationInView(this.view.nativeViewProtected).x - offsetX;`
`605`	`607`	`}`
`606`	`608`
`607`	`609`	`getY(): number {`
`608`		`- return this.getMainPointer().locationInView(this.view.nativeViewProtected).y;`
	`610`	`+ const offset = this.view.nativeViewProtected.contentOffset;`
	`611`	`+ const offsetY = offset ? offset.y : 0;`
	`612`	`+ return this.getMainPointer().locationInView(this.view.nativeViewProtected).y - offsetY;`
`609`	`613`	`}`
`610`	`614`	`}`