score:5

Accepted answer

looking at the documentation it looks like you should be using backbuttontextstyle or use backbuttonimage to use a different icon image

check it out here

update:

you can change the colour of the image by setting the tintcolor in the leftbuttoniconstyle prop

score:1

add these two line inside the scenes backbuttontintcolor = '#000' leftbuttonstyle = {{color : '#000',tintcolor : '#000'}}

as follows

<scene
          key="scene key"
          component={scene component}
          title="your title"
          backbuttontextstyle = {{color:'#000000'}}
          barbuttoniconstyle={{ tintcolor: '#000000' }}
          titlestyle = {{color : '#000000'}}
          navigationbarstyle = {{backgroundcolor : '#ffc60a'}}
          backbuttontintcolor = '#000'
          leftbuttonstyle = {{color : '#000',tintcolor : '#000'}}
          //hidenavbar={true}
        />

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