需求

实现一个能够输入6位密码框组件（如微信支付密码框类似）

支付组件.jpeg

思路一（不可行方案）

使用一个Input 配合 letter-spacing 属性使用。后实验下来，input 并不使用css中的 letter-spacing 属性。

思路二 （可行方案）

在页面中，隐藏一个input，然后控制 input 组件的 focus 属性从而实现6位密码框输入。
需要注意的是，在我写这个组件并验证时，(iphone xs max ios13.3) 微信版本为7.0.8，实测组件可以正常工作。当我微信升级为7.0.9时，input 手动设置 focus 并没有生效，同时，该 input 没有办法再次聚焦并弹出输入法。（很奇怪的是，我同事的手机也是iphone xs max ios13.3 微信 7.0.9 没有这个问题

组件布局拆分

支付输入框3.png

组件wxml

<view class="pay-password-container">
  <text class="pay-password-title">安全验证</text>
  <text class="pay-password-tips">您使用了虚拟资产，为保障安全，请输入支付密码！</text>
  <view style="position:relative">
    <view class="pay-password-layout">
      <view wx:for="{{passwordlayout}}" class="pay-password-item">
        <view wx:if="{{index < passwordCode.length}}" class="dot" />
      </view>
    </view>
    <!-- 这里采用了一个投机取巧的办法，使用两个Input 防止在某些机型上，input设置focus会导致input整个失效-->
    <input value="{{passwordCode}}" password maxlength="6" type="number" class='input-container-2' bindinput="passwordInput" />
  </view>
  <input value="{{passwordCode}}" focus="{{focus}}" maxlength="6" type="number" class='input-container-2' bindinput="passwordInput" bindfocus="getFocus" bindblur="blur" />
  <view class='forget-password' catchtap="clickForgetPassword">忘记密码?</view>
  <view class="empty-layout" />
  <view class="controll-layout">
    <view class="cancel-button" catchtap="dismiss">
      <text>取消</text>
    </view>
    <view class="divider" />
    <view class="sure-button" catchtap="sure">
      <text>确定</text>
    </view>
  </view>
  </view>

组件wxss

.pay-password-container {
  width: 650rpx;
  height: 525rpx;
  border-radius: 16rpx;
  background: #fff;
  display: flex;
  display: -webkit-flex;
  flex-direction: column;
  align-items: center;
}

.pay-password-title {
  font-size: 40rpx;
  font-weight: bold;
  color: #030303;
  margin-top: 59rpx;
  flex-shrink: 0;
}

.pay-password-tips {
  font-size: 24rpx;
  color: #333;
  opacity: 0.5;
  margin-top: 31rpx;
  flex-shrink: 0;
}

.pay-password-layout {
  display: flex;
  display: -webkit-flex;
  flex-direction: row;
  margin-top: 40rpx;
  flex-shrink: 0;
  z-index: 105rpx;
}

.pay-password-item:first-child {
  height: 90rpx;
  width: 90rpx;
  border-radius: 8rpx 0rpx 0rpx 8rpx;
  border-top: 1px solid #bbb;
  border-left: 1px solid #bbb;
  border-bottom: 1px solid #bbb;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  display: flex;
  display: -webkit-flex;
  justify-content: center;
  align-items: center;
}

.pay-password-item {
  height: 90rpx;
  width: 90rpx;
  border-top: 1px solid #bbb;
  border-left: 1px solid #bbb;
  border-bottom: 1px solid #bbb;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  display: flex;
  display: -webkit-flex;
  justify-content: center;
  align-items: center;
}

.pay-password-item:last-child {
  height: 90rpx;
  width: 90rpx;
  border-radius: 0rpx 8rpx 8rpx 0rpx;
  border-top: 1px solid #bbb;
  border-left: 1px solid #bbb;
  border-bottom: 1px solid #bbb;
  border-right: 1px solid #bbb;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  display: flex;
  display: -webkit-flex;
  justify-content: center;
  align-items: center;
}

.pay-password-item .dot {
  height: 20rpx;
  width: 20rpx;
  background: #030303;
  border-radius: 50%;
}

.input-container-2 {
  position: absolute;
  top: 40rpx;
  height: 100rpx;
  width: 1500rpx;
  left: -500rpx;
}

.empty-layout {
  flex-grow: 1;
}

.controll-layout {
  flex-shrink: 0;
  border-top: 1px solid #e9e9e9;
  width: 100%;
  height: 100rpx;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  display: flex;
  display: -webkit-flex;
}

.controll-layout .cancel-button {
  flex-grow: 1;
  display: flex;
  display: -webkit-flex;
  justify-content: center;
  align-items: center;
}

.cancel-button text {
  color: #333;
  opacity: 0.5;
  font-size: 34rpx;
}

.controll-layout .divider {
  background: #e9e9e9;
  height: 100%;
  width: 1px;
  flex-shrink: 0;
}

.controll-layout .sure-button {
  flex-grow: 1;
  display: flex;
  display: -webkit-flex;
  justify-content: center;
  align-items: center;
}

.sure-button  text {
  font-size: 34rpx;
  color: #f8aa00;
  font-weight: bold;
}

.forget-password {
  font-size: 24rpx;
  color: #333;
  opacity: 0.5;
  margin-top: 30rpx;
  align-self: flex-end;
  margin-right: 55rpx;
}

组件js

input1 带 focus 属性，手动设置 focus 让其弹出。
input2 不带 focus 属性，需要用户手动点击输入框（6格）后，输入。
这样就避免了对 输入框（6格）监听tap事件，并设置focus 来让 input 聚焦，让输入法弹起。就解决了部分手机上手动设置 focus 会导致 input 组件没有响应的问题。

Component({
  data: {
    passwordlayout: [1, 1, 1, 1, 1, 1],
    passwordCode: "",
    focus: false
  },

  methods: {
    showModal: function () {
      this.setData({
        focus: true
      })
    },

    closeModal: function () {
      this._clearData();
    },

    passwordInput: function (e) {
      this.setData({
        passwordCode: e.detail.value
      })
    },

    focusInput: function () {
      this.setData({
        focus: true
      })
    },

    getFocus: function () {
      this.setData({
        focus: true
      })
    },

    blur: function () {
      this.setData({
        focus: false
      })
    },

    dismiss: function (e) {
      this.closeModal();
    },

    sure: function (e) {
      if (this.data.passwordCode.length < 6) {
        UIManager.showToast('请输入支付密码');
        return;
      }
      //todo 支付密码验证
    },

    clickForgetPassword: function (e) {
      //todo 忘记密码
    },
  }
})