navBar.wxml

<view class="lxy-nav-bar {{extClass}}" style="background: {{background}};height: {{navBarHeight+ navBarExtendHeight}}px;">
    <view class="lxy-nav-bar__placeholder {{ios ? 'ios' : 'android'}}" style="padding-top: {{navBarHeight+ navBarExtendHeight}}px;visibility: hidden;"></view>
    <view class="lxy-nav-bar__inner {{ios ? 'ios' : 'android'}}" style="{{navigationbarinnerStyle}}{{displayStyle}}">
		<image wx:if="{{navBg}}" class="ui-navBg" src="{{navBg}}" style="height: {{navBarHeight+ navBarExtendHeight}}px;" mode="widthFit"></image>
        <view class='lxy-nav-bar__left' style="{{navBarLeft}}">
            <block wx:if="{{back&&!home}}">
                <view bindtap="back" class="lxy-nav-bar__button lxy-nav-bar__btn_goback {{iconTheme}}"></view>
            </block>
            <block wx:if="{{!back&&home}}">
                <view bindtap="home" class="lxy-nav-bar__button lxy-nav-bar__btn_gohome {{iconTheme}}"></view>
            </block>
            <block wx:elif="{{back&&home}}">
                <view class="lxy-nav-bar__buttons {{ios ? 'ios' : 'android'}}" wx:if="{{home}}">
                    <view bindtap="back" class="lxy-nav-bar__button lxy-nav-bar__btn_goback {{iconTheme}}" wx:if="{{back}}"></view>
                    <view bindtap="home" class="lxy-nav-bar__button lxy-nav-bar__btn_gohome {{iconTheme}}"></view>
                </view>
            </block>
            <block wx:else>
                <slot name="left"></slot>
            </block>
        </view>
        <view class='lxy-nav-bar__center'>
            <block wx:if="{{title}}">
                <text>{{title}}</text>
            </block>
            <view class='lxy-nav-bar-search' style="height:{{capsulePosition.height}}px;" wx:elif="{{searchBar}}" bindtap="search">
                <view class='lxy-nav-bar-search__icon' />
                <view class='lxy-nav-bar-search__input'>{{searchText}}</view>
            </view>
            <!-- 暂时不开发标题loading. 看后期需要 -->
            <!-- <view wx:if="{{loading}}" class="lxy-nav-bar__loading">
                <view class="lxy-loading" style="width:{{size.width}}rpx;height:{{size.height}}rpx;"></view>
            </view> -->
            <block wx:else>
                <slot name="center"></slot>
            </block>
        </view>
        <view class='lxy-nav-bar__right'>
            <slot name="right"></slot>
        </view>
    </view>
</view>