How to implement slide unlock and gesture password in uniapp

Implementing slide unlock and gesture password is a common requirement in UniApp. This article will introduce in detail how to implement these two functions in UniApp and provide specific code examples.

1. Sliding to unlock
Sliding to unlock is a common way to unlock a mobile phone. Sliding to unlock in UniApp can be achieved by listening to touch events.

The specific steps are as follows:

1. In the page where sliding unlocking is required, add a sliding block element to receive the user's sliding operation.

<view class="slider" @touchstart="touchStart" @touchmove="touchMove" @touchend="touchEnd"></view>

2. Define the variables required for sliding unlocking in the data of the page, such as the initial position of the slider, the sliding distance, etc.

data() {
  return {
    startX: 0, // 滑块开始滑动的初始位置
    moveX: 0,  // 滑块滑动的距离
    unlocked: false // 是否解锁成功的标志
  }
}

3. In the methods of the page, implement the event processing function required for sliding unlock.

methods: {
  touchStart(event) {
    this.startX = event.touches[0].clientX
  },
  touchMove(event) {
    this.moveX = event.touches[0].clientX - this.startX
    // 根据滑块的滑动距离判断是否解锁成功
    if (this.moveX >= 80) {
      this.unlocked = true
    }
  },
  touchEnd() {
    // 根据解锁成功标志判断是否跳转到解锁成功页面
    if (this.unlocked) {
      uni.navigateTo({
        url: '/pages/unlocked/unlocked'
      })
    }
  }
}

4. Style the slider in the style file.

.slider {
  width: 300rpx;
  height: 100rpx;
  background-color: #ccc;
  border-radius: 50rpx;
}

Through the above steps, we can implement the slide to unlock function in UniApp. When the user slides the slider farther than 80 px, it will jump to the page where the unlock is successful.

2. Gesture password
Gesture password is a common way to unlock a mobile phone. The gesture password can be implemented in UniApp through canvas drawing and event monitoring.

The specific steps are as follows:

1. In the page where gesture password needs to be implemented, add a canvas element.

<canvas id="canvas" @touchstart="touchStart" @touchmove="touchMove" @touchend="touchEnd"></canvas>

2. Define the variables related to the gesture password in the data of the page, such as the drawing path, the position of the finger touch, etc.

data() {
  return {
    ctx: null,   // canvas上下文
    startX: 0,   // 手指触摸的初始位置
    startY: 0,
    points: [],  // 绘制路径所需的所有点
    password: '' // 用户设置的手势密码
  }
}

3. In the onLoad life cycle of the page, initialize the canvas context.

onLoad() {
  // 获取canvas上下文
  this.ctx = uni.createCanvasContext('canvas', this)
}

4. In the methods of the page, implement the event processing function of the gesture password.

methods: {
  touchStart(event) {
    this.startX = event.touches[0].clientX
    this.startY = event.touches[0].clientY

    // 清除之前的绘制路径
    this.points = []
  },
  touchMove(event) {
    let moveX = event.touches[0].clientX - this.startX
    let moveY = event.touches[0].clientY - this.startY

    // 更新绘制路径的点
    this.points.push({x: moveX, y: moveY})

    this.ctx.clearRect(0, 0, 300, 300) // 清除canvas
    this.drawGesture() // 绘制手势路径
  },
  touchEnd() {
    // 将绘制路径转换成密码
    this.password = this.pointsToString(this.points)
    console.log('设置的手势密码为：' + this.password)
  },
  drawGesture() {
    this.ctx.beginPath()
    this.points.forEach((point, index) => {
      if (index === 0) {
        this.ctx.moveTo(point.x, point.y)
      } else {
        this.ctx.lineTo(point.x, point.y)
      }
    })
    this.ctx.stroke()
    this.ctx.closePath()
    this.ctx.draw()
  },
  pointsToString(points) {
    return points.map(point => {
      return Math.floor((point.x + 150) / 100) + Math.floor((point.y + 150) / 100) * 3 + 1
    }).join('')
  }
}

5. Set the style of canvas in the style file.

canvas {
  width: 300rpx;
  height: 300rpx;
  background-color: #eee;
}

Through the above steps, we can implement the gesture password function in UniApp. Users draw lines in the canvas according to their own needs, and the drawn paths will be converted into corresponding digital passwords and printed in the console.

Summary:
This article introduces how to implement slide unlock and gesture password functions in UniApp, and provides corresponding code examples. Through the above implementation method, we can easily implement slide unlock and gesture password functions in UniApp, providing users with a more convenient and secure way to unlock their phones. Hope this article is helpful to everyone!

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