sample-login4.js

onTypeEmail(email) {
    return this.setState({ email });
  }
onTypePassword(password) {
   this.setState({ password });
}

render() {
    return (
      <View style={login.container}>
          <EmailInput
            value={this.state.email}
            onChangeText={this.onTypeEmail}
            placeholder={'Username or Email'}
            autoFocus
          />
          <PasswordInput
            value={this.state.password}
            onChangeText={this.onTypePassword}
            placeholder={'Password'}
          />