修改登录界面样式 文字居中，图片大小自适应 review 于良

@@ -55,6 +55,7 @@ export default class Login extends Component {
                     onPress={this.props.onDeleteUserPress}>
                     <Image
                         style={styles.buttonDelete}
+                        resizeMode={Image.resizeMode.contain}
                         source={require('../images/delete.png')}
                     />
                 </TouchableOpacity>
@@ -70,7 +71,6 @@ export default class Login extends Component {
                     placeholder={'密码'}
                     underlineColorAndroid='transparent'
                     onChangeText={this.props.onPwdChange}
-                    value={this.props.pwd}
                     selectionColor={'white'}
                     autoCapitalize={'none'}
                     autoCorrect={false}
@@ -78,8 +78,9 @@ export default class Login extends Component {
                 <TouchableOpacity
                     onPress={this.props.onShowPwdPress}>
                     <Image
-                        style={styles.buttonDelete}
-                        source={require('../images/eyes.png')}
+                        style={styles.buttonDisplayPwd}
+                        resizeMode={Image.resizeMode.contain}
+                        source={this.props.isDisplayPwd?require('../images/eyes.png'):require('../images/eyeopen.png')}
                     />
                 </TouchableOpacity>
             </View>
@@ -145,12 +146,15 @@ var styles = StyleSheet.create({
     height:40,
     paddingLeft:10,
     color:'white',
-
+    textAlignVertical: "center",
+    paddingTop:10
   },
   pwd: {
     flex: 1,
     paddingLeft:10,
     color:'white',
+    textAlignVertical: "center",
+    paddingTop:10
   },
   button: {
       marginLeft: 20,
@@ -168,4 +172,9 @@ var styles = StyleSheet.create({
     height:20,
     marginRight:10,
   },
+  buttonDisplayPwd: {
+    width:25,
+    height:18,
+    marginRight:10,
+  },
 });