看如下图片，输入框有时能出现有时被遮挡住，怎么处理可以保证软键盘高度准确呢？

js部分代码

 inputFocus: function(t) {

        var that = this;

        that.setData({

            inputFocus: !0,

            bottomType: 1,    // 原来是0

            hight362: t.detail.height + 45 + 40,    //t.detail.height键盘软盘高度，45输入框高度，40最后聊天记录和输入框顶部之间高度

        });

        duration = 980; 

        that.toViewBottom(); 

        that.setData({        

            bottom_val: 0, 

        });

        },

wxml部分代码

<view class="chat-tencvi" style="{{sendout?'width:63%;':''}}">

        <textarea mode="aspectFill"  adjust-position="{{false}}"  bindblur="inputBlur" bindfocus="inputFocus" bindinput="bindMsgInput" wx:if="{{!voice}}" focus="{{isInputFocus}}" placeholder="{{inputreminder}}" value="{{inputMsg}}" maxlength="-1"/>

        <view  bindtouchstart="touchdown" bindtouchend="touchup" wx:if="{{voice}}">按住 说话</view>

      </view>