fix NaN on mount (leecade#1193)

wem2017 · Jun 22, 2020 · bdf2539 · bdf2539
1 parent 28d034a
commit bdf2539
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/index.js b/src/index.js
@@ -464,7 +464,7 @@ export default class extends Component {
     if (!this.internals.offset)
       // Android not setting this onLayout first? https://github.com/leecade/react-native-swiper/issues/582
       this.internals.offset = {}
-    const diff = offset[dir] - this.internals.offset[dir]
+    const diff = offset[dir] - (this.internals.offset[dir] || 0)
     const step = dir === 'x' ? state.width : state.height
     let loopJump = false