Is there an existing issue for this?

• I have searched the existing issues

Explain what you did

When implementing dark mode into my application the search bar when set to lightmode={false} doesn't respect it to be in dark mode.

I've tried this in a hook, using a theme and with a boolean hard coded as a string and without a string.

<SearchBar lightTheme={false}
placeholder={"Search Matches"}
platform='ios'
showLoading={isRefreshing}
onChangeText={searchTerm => handleSearch(searchTerm)} value={searchTerm} />

<SearchBar  lightTheme='false'
            placeholder={"Search Matches"} 
            platform='ios' 
            showLoading={isRefreshing}
            onChangeText={searchTerm => handleSearch(searchTerm)} value={searchTerm} />

Expected behavior

The SearchBar component still stays in lightmode I would expect this to be able to be toggled between the two so I can bind this to a hook to complete dark/lightmode support in my app.

Describe the bug

When the lightmode attribute is set to false it doesn't go into dark mode theme.

Steps To Reproduce

<SearchBar  lightTheme={false}
                      placeholder={"Search Matches"} 
                      platform='ios' 
                      showLoading={isRefreshing}
                      onChangeText={searchTerm => handleSearch(searchTerm)} value={searchTerm} />

    <SearchBar  lightTheme='false'
                placeholder={"Search Matches"} 
                platform='ios' 
                showLoading={isRefreshing}
                onChangeText={searchTerm => handleSearch(searchTerm)} value={searchTerm} />

Screenshots

Your Environment

react-native-elements: 3.4.0
react-native: 0.64.3