React Native, TouchableOpacity wrapping floating button get nothing

Question

I'm creating a simple action button (floating button)

This is working :

<View style={{
    width: this.props.size,
    height: this.props.size,
    borderRadius: this.props.size / 2,
    backgroundColor: '#ee6e73',
    position: 'absolute',
    bottom: 10,
    right: 10,
    flexDirection:'row'
}}>
    <Text>
        +
    </Text>
</View>

This is not :

<TouchableOpacity
        onPress={()=>{
        }} >
    <View style={{
        width: this.props.size,
        height: this.props.size,
        borderRadius: this.props.size / 2,
        backgroundColor: '#ee6e73',
        position: 'absolute',
        bottom: 10,
        right: 10,
        flexDirection:'row'
    }}>
        <Text>
            +
        </Text>
    </View>
</TouchableOpacity>

Just wrap with TouchableOpacity then my button not show up without any errors.

React 0.1.7, Android

Then I try move styling from View to TouchableOpacity, It's work

<TouchableOpacity
        onPress={()=>{
        }} 
        style={{
            width: this.props.size,
            height: this.props.size,
            position: 'absolute',
            borderRadius: this.props.size / 2,
            backgroundColor: '#ee6e73',
            bottom: 10,
            right: 10,
        }}>
    <Text>
        +
    </Text>
</TouchableOpacity>

Can any one explain me why?

React Native docs said

[https://facebook.github.io/react-native/docs/touchableopacity.html][1]

A wrapper for making views respond properly to touches. This is done without actually changing the view hierarchy, and in general is easy to add to an app without weird side-effects.

This mean I wrap my original view and it would work as I expected, But it's not.

Answer 1

From my experience, TouchableOpacity does not work well with absolute positioning. Perhaps if you remove that, the onPress will work again.

Also please note that it is EXTREMELY important what element you render first and what you render last.

For example, if you do:

<View>
    <TouchableOpacity style={{position:'absolute'}} onPress={()=> 
           {console.log("It works or not?")}}>
   </TouchableOpacity>
    <Text style={styles.aStyle}>
        Some text bla bla
    </Text>
</View>

there is a pretty good chance that the Text will be rendered on top of the TouchableOpacity, therefore you won't be able to get the onPress working.

Then since the position is absolute, all you have to do is render it as the last child of the View:

<View>
    <Text style={styles.aStyle}>
        Some text bla bla
    </Text>
    <TouchableOpacity style={{position:'absolute}} onPress={()=> 
       {console.log("It works or not?")}}>
   </TouchableOpacity>
</View>

Answer 2

TouchableOpacity does not assume the style of the view it is the parent of. You need provide it style information.