From ff2e865265948b9e76cb2d0fb15c22831abb038f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miguel=20D=C3=ADaz?= <ademouse@gmail.com>
Date: Wed, 27 Mar 2019 13:48:17 +0100
Subject: [PATCH 1/2] Prevent React setState on unmounted Component

---
 index.js | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/index.js b/index.js
index 8528ba2..9c896f3 100644
--- a/index.js
+++ b/index.js
@@ -4,6 +4,7 @@ import React, { Component } from 'react'
 import { View, NativeMethodsMixin, Dimensions } from 'react-native'
 
 exports.InViewPort = class extends Component {
+  isMounted = true
   constructor(props) {
     super(props)
     this.state = { rectTop: 0, rectBottom: 0 }
@@ -16,6 +17,7 @@ exports.InViewPort = class extends Component {
   }
 
   componentWillUnmount() {
+    this.isMounted = false
     this.stopWatching()
   }
 
@@ -37,11 +39,13 @@ exports.InViewPort = class extends Component {
         return
       }
       this.myview.measure((x, y, width, height, pageX, pageY) => {
-        this.setState({
-          rectTop: pageY,
-          rectBottom: pageY + height,
-          rectWidth: pageX + width
-        })
+        if (this.isMounted) {
+          this.setState({
+            rectTop: pageY,
+            rectBottom: pageY + height,
+            rectWidth: pageX + width
+          })
+        }
       })
       this.isInViewPort()
     }, this.props.delay || 100)

From debc4cab3770814bec2fb8ac4325afdee0024155 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miguel=20D=C3=ADaz?= <ademouse@gmail.com>
Date: Thu, 28 Mar 2019 13:30:48 +0100
Subject: [PATCH 2/2] isMounted "flag" set to true inside componentDidMount()
 method

---
 index.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 9c896f3..18ccf8c 100644
--- a/index.js
+++ b/index.js
@@ -4,13 +4,14 @@ import React, { Component } from 'react'
 import { View, NativeMethodsMixin, Dimensions } from 'react-native'
 
 exports.InViewPort = class extends Component {
-  isMounted = true
+  isMounted = false
   constructor(props) {
     super(props)
     this.state = { rectTop: 0, rectBottom: 0 }
   }
 
   componentDidMount() {
+    this.isMounted = true
     if (!this.props.disabled) {
       this.startWatching()
     }