Swiper on button click jumps 2 slides

Which OS ?

ios and android

Version

Which versions are you using:

• react-native-swiper v1.5.13
• react-native v0.56.0

Expected behaviour

On click the button go to the next slide

Actual behaviour

When i click to the button on the first time it jumps to the same slide again

How to reproduce mit>

To help us, please fork this component, modify one example in examples folder to reproduce your issue and include link here.

Steps to reproduce

1. yarn add react-native-swiper
2. Create a component like this

<Swiper
 height={140}
 showsButtons
>
  <Text>Slide 1</Text>
  <Text>Slide 2</Text>
</Swiper>

4.Click on the button to go to the next slide

[HighSoftWare96]

#720

[JayceTsien]

add the key to the Swiper componet like this:

<Swiper
        key={this.state.productImages.length}  // focus
        style={styles.swiper}
>
        {swiperItems}
</Swiper>

or like this:

const swiperItems = this.state.productImages.map(item => {
        return(
                <Image 
                        source={{uri: item.realpath}}
                        style={styles.swiperimage}
                        key={item.position}  // focus
                />
        )
})