Using uniapp to implement gesture password function

Using uniapp to implement gesture password function

The gesture password function is very common in mobile application development. It provides a convenient and secure way to protect user privacy. and data security. In this article, we will use the uniapp development framework to implement the gesture password function and give specific code examples.

uniapp is a cross-platform development framework based on Vue.js. It can be used to develop applications for multiple platforms such as iOS, Android, H5, and WeChat applets.

First, we need to create a gesture password component in uniapp. The HTML section could simply consist of nine circles, with each circle acting as a touch area. We can use Vue's v-for directive to generate nine circles and bind a click event to each circle.

<template>
  <view>
    <view class="gesture-pwd">
      <view
        v-for="(item, index) in 9"
        :key="index"
        :data-index="index"
        class="gesture-pwd-circle"
        :class="{ 'gesture-pwd-selected': item.selected }"
        @click="selectCircle(index)"
      ></view>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      gesturePwd: [false, false, false, false, false, false, false, false, false],
      selectedCircles: []
    };
  },
  methods: {
    selectCircle(index) {
      this.gesturePwd[index] = !this.gesturePwd[index];
      // 更新选中的圆圈
      this.selectedCircles = this.gesturePwd
        .map((item, i) => (item ? i + 1 : -1))
        .filter(item => item !== -1);
    }
  }
};
</script>

<style>
.gesture-pwd {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin: 32px;
}

.gesture-pwd-circle {
  width: 60px;
  height: 60px;
  margin: 5px;
  border-radius: 50%;
  background-color: #ddd;
  display: flex;
  align-items: center;
  justify-content: center;
}

.gesture-pwd-selected {
  background-color: #1890ff;
  color: #fff;
}
</style>

In the above code, we use an array named gesturePwd to represent the selected status of the nine circles. The initial value is [false, false, false, false , false, false, false, false, false]. When the user clicks on a circle, we toggle the selected state by updating the corresponding index in the array.

We also use a calculated property called selectedCircles to get the index of the currently selected circle for subsequent gesture password verification.

Next, we need to introduce the gesture password component into uniapp and write relevant logic to implement the gesture password verification function. Suppose we place the verification process of gesture password on the login page. In the login page, we can use the uni.navigateBack() method provided by uniapp to jump to the gesture password page and pass the global event of uniapp onBackPressTo handle the return event.

export default {
  data() {
    return {
      gesturePwd: ''
    }
  },
  onBackPress() {
    // 处理返回事件，跳转到上一页
    uni.navigateBack()
    return true
  },
  methods: {
    validateGesturePwd() {
      // 获取当前选中的圆圈的索引
      const indexes = this.$refs.gesturePwd.selectedCircles

      // 将选中的圆圈的索引转换为字符串，用于验证
      const validatePwd = indexes.join('')

      // 判断手势密码是否正确
      if (validatePwd === '123') {
        uni.showToast({
          title: '手势密码正确',
          icon: 'success'
        })
      } else {
        uni.showToast({
          title: '手势密码错误',
          icon: 'none'
        })
      }
    }
  }
}

In the above code, we define a data variable named gesturePwd to store the gesture password entered by the user.

In the validateGesturePwd method, we obtain the selectedCircles attribute in the gesture password component through this.$refs.gesturePwd.selectedCircles, that is The index of the currently selected circle.

Finally, we convert the obtained circle index into a string and compare it with the preset gesture password to determine whether the gesture password is correct.

The above is a code example of using uniapp to implement the gesture password function. By writing the corresponding HTML, CSS and JavaScript code, we can easily implement the gesture password function in uniapp and provide a convenient and secure user experience.

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