fix hide Skip Done Button style

Author: FuYaoDe

AppIntro.js

@@ -203,23 +203,27 @@ export default class AppIntro extends Component {
     }
     return (
       <View style={[this.styles.paginationContainer]}>
-        {this.props.showSkipButton && <SkipButton
+        {this.props.showSkipButton ? <SkipButton
           {...this.props}
           {...this.state}
           isSkipBtnShow={isSkipBtnShow}
           styles={this.styles}
-          onSkipBtnClick={() => this.props.onSkipBtnClick(index)} />}
+          onSkipBtnClick={() => this.props.onSkipBtnClick(index)} /> :
+          <View style={this.styles.btnContainer} />
+        }
         {this.props.showDots && RenderDots(index, total, {
           ...this.props,
           styles: this.styles
         })}
-        {this.props.showDoneButton && <DoneButton 
+        {this.props.showDoneButton ? <DoneButton
             {...this.props}
             {...this.state}
             isDoneBtnShow={isDoneBtnShow}
             styles={this.styles}
             onNextBtnClick={this.onNextBtnClick.bind(this, context)}
-            onDoneBtnClick={this.props.onDoneBtnClick} />}
+            onDoneBtnClick={this.props.onDoneBtnClick} /> :
+            <View style={this.styles.btnContainer} />
+          }
       </View>
     );
   }