Update index.js

fixed 'onChange delayed' bug peacechen#114
added 'Alert does not work in SampleApp for iOS' bug peacechen#6

index.js

@@ -166,10 +166,7 @@ export default class ModalSelector extends React.Component {
     }
 
     onChange = (item) => {
-        if (Platform.OS === 'android' || (Modal.propTypes !== undefined && !Modal.propTypes.onDismiss)) { // don't know if this will work for previous version, please check!
-            // RN >= 0.50 on iOS comes with the onDismiss prop for Modal which solves RN issue #10471
-            this.props.onChange(item);
-        }
+        this.props.onChange(item);
         this.setState({ selected: this.props.labelExtractor(item), changedItem: item }, () => {
           if (this.props.closeOnChange)
             this.close();
@@ -293,7 +290,6 @@ export default class ModalSelector extends React.Component {
                 visible={this.state.modalVisible}
                 onRequestClose={this.close}
                 animationType={this.props.animationType}
-                onDismiss={() => this.state.changedItem && this.props.onChange(this.state.changedItem)}
             >
                 {this.renderOptionList()}
             </Modal>