手勢(shì)解鎖是app上常見(jiàn)的解鎖方式，相比輸入密碼方式操作起來(lái)要方便許多。下面展示如何基于微信小程序?qū)崿F(xiàn)手機(jī)解鎖。最終實(shí)現(xiàn)效果如下圖:

手勢(shì)解鎖

整個(gè)功能基于canvas實(shí)現(xiàn)，首先添加畫(huà)布組件，并設(shè)定樣式

<!--index.wxml-->
<view class="container">
  <canvas canvas-id="id-gesture-lock" class="gesture-lock" bindtouchstart="onTouchStart"
    bindtouchmove="onTouchMove" bindtouchend="onTouchEnd"></canvas>
</view>

.gesture-lock {
    margin: 100rpx auto;
    width: 300px;
    height: 300px;
    background-color: #ffffff;
}

手勢(shì)解鎖實(shí)現(xiàn)代碼在gesture_lock.js中(完整源碼地址見(jiàn)末尾)。

初始化

    constructor(canvasid, context, cb, opt){
        this.touchPoints = [];
        this.checkPoints = [];
        this.canvasid = canvasid;
        this.ctx = context;
        this.width = opt && opt.width || 300; //畫(huà)布長(zhǎng)度
        this.height = opt && opt.height || 300; //畫(huà)布寬度
        this.cycleNum = opt && opt.cycleNum || 3;
        this.radius = 0;  //觸摸點(diǎn)半徑
        this.isParamOk = false;
        this.marge = this.margeCircle = 25; //觸摸點(diǎn)及觸摸點(diǎn)和畫(huà)布邊界間隔
        this.initColor = opt && opt.initColor || '#C5C5C3';   
        this.checkColor = opt && opt.checkColor || '#5AA9EC';
        this.errorColor = opt && opt.errorColor || '#e19984';
        this.touchState = "unTouch";
        this.checkParam();
        this.lastCheckPoint = null;
        if (this.isParamOk) {
            // 計(jì)算觸摸點(diǎn)的半徑長(zhǎng)度
            this.radius = (this.width - this.marge * 2 - (this.margeCircle * (this.cycleNum - 1))) / (this.cycleNum * 2)
            this.radius = Math.floor(this.radius);
            // 計(jì)算每個(gè)觸摸點(diǎn)的圓心位置
            this.calCircleParams();
        }
        this.onEnd = cb; //滑動(dòng)手勢(shì)結(jié)束時(shí)的回調(diào)函數(shù)
    }

主要設(shè)置一些參數(shù)，如canvas的長(zhǎng)寬，canvas的context，手勢(shì)鎖的個(gè)數(shù)(3乘3, 4乘4)，手勢(shì)鎖的顏色，手勢(shì)滑動(dòng)結(jié)束時(shí)的回調(diào)函數(shù)等。并計(jì)算出手勢(shì)鎖的半徑。

計(jì)算每個(gè)手勢(shì)鎖的圓心位置

    calCircleParams() {
        let n = this.cycleNum;
        let count = 0;
        for (let i = 0; i < n; i++) {
            for (let j = 0; j < n; j++){
                count++;
                let touchPoint = {
                    x: this.marge + i * (this.radius * 2 + this.margeCircle) + this.radius,
                    y: this.marge + j * (this.radius * 2 + this.margeCircle) + this.radius,
                    index: count,
                    check: "uncheck",
                }
                this.touchPoints.push(touchPoint)
            }
        }
    }

繪制手勢(shì)鎖

     for (let i = 0; i < this.touchPoints.length; i++){
            this.drawCircle(this.touchPoints[i].x, this.touchPoints[i].y, this.radius, this.initColor)
     }
     this.ctx.draw(true);

接下來(lái)就是識(shí)別用戶的滑動(dòng)行為，判斷用戶劃過(guò)了哪些圓圈，進(jìn)而識(shí)別出用戶的手勢(shì)。

在touchstart和touchmove事件中檢測(cè)觸發(fā)并更新畫(huà)布

<p style="margin-bottom: 7px; margin-top: 14px;">   onTouchStart(e) {<br/>        // 不識(shí)別多點(diǎn)觸控<br/>        if (e.touches.length > 1){<br/>            this.touchState = "unTouch";<br/>            return;<br/>        }<br/>        this.touchState = "startTouch";<br/>        this.checkTouch(e);<br/>        let point = {x:e.touches[0].x, y:e.touches[0].y};<br/>        this.drawCanvas(this.checkColor, point);<br/>    }<br/><br/>    onTouchMove(e) {<br/>        if (e.touchState === "unTouch") {<br/>            return;<br/>        }<br/>        if (e.touches.length > 1){<br/>            this.touchState = "unTouch";<br/>            return;<br/>        }<br/>        this.checkTouch(e);<br/>        let point = {x:e.touches[0].x, y:e.touches[0].y};<br/>        this.drawCanvas(this.checkColor, point);<br/>    }<br/></p>

檢測(cè)用戶是否劃過(guò)某個(gè)圓圈

    checkTouch(e) {
        for (let i = 0; i < this.touchPoints.length; i++){
            let point = this.touchPoints[i];
            if (isPointInCycle(e.touches[0].x, e.touches[0].y, point.x, point.y, this.radius)) {
                if (point.check === &#39;uncheck&#39;) {
                    this.checkPoints.push(point);
                    this.lastCheckPoint = point;
                }
                point.check = "check"
                return;
            }
        }
    }

更新畫(huà)布

     drawCanvas(color, point) {
        //每次更新之前先清空畫(huà)布
        this.ctx.clearRect(0, 0, this.width, this.height);
        //使用不同顏色和形式繪制已觸發(fā)和未觸發(fā)的鎖
        for (let i = 0; i < this.touchPoints.length; i++){
            let point = this.touchPoints[i];
            if (point.check === "check") {
                this.drawCircle(point.x, point.y, this.radius, color);
                this.drawCircleCentre(point.x, point.y, color);
            }
            else {
                this.drawCircle(this.touchPoints[i].x, this.touchPoints[i].y, this.radius, this.initColor)
            }
        }
        //繪制已識(shí)別鎖之間的線段
        if (this.checkPoints.length > 1) {
             let lastPoint = this.checkPoints[0];
             for (let i = 1; i < this.checkPoints.length; i++) {
                 this.drawLine(lastPoint, this.checkPoints[i], color);
                 lastPoint = this.checkPoints[i];
             }
        }
        //繪制最后一個(gè)識(shí)別鎖和當(dāng)前觸摸點(diǎn)之間的線段
        if (this.lastCheckPoint && point) {
            this.drawLine(this.lastCheckPoint, point, color);
        }
        this.ctx.draw(true);
    }

當(dāng)用戶滑動(dòng)結(jié)束時(shí)調(diào)用回調(diào)函數(shù)并傳遞識(shí)別出的手勢(shì)

    onTouchEnd(e) {
        typeof this.onEnd === 'function' && this.onEnd(this.checkPoints, false);
    }

    onTouchCancel(e) {
        typeof this.onEnd === 'function' && this.onEnd(this.checkPoints, true);
    }

重置和顯示手勢(shì)錯(cuò)誤

    gestureError() {
        this.drawCanvas(this.errorColor)
    }

    reset() {
        for (let i = 0; i < this.touchPoints.length; i++) {
            this.touchPoints[i].check = &#39;uncheck&#39;;
        }
        this.checkPoints = [];
        this.lastCheckPoint = null;
        this.drawCanvas(this.initColor);
    }

如何調(diào)用
在onload方法中創(chuàng)建lock對(duì)象并在用戶觸摸事件中調(diào)用相應(yīng)方法

  onLoad: function () {
    var s = this;
    this.lock = new Lock("id-gesture-lock", wx.createCanvasContext("id-gesture-lock"), function(checkPoints, isCancel) {
      console.log('over');
      s.lock.gestureError();
      setTimeout(function() {
        s.lock.reset();
      }, 1000);
    }, {width:300, height:300})
    this.lock.drawGestureLock();
    console.log('onLoad')
    var that = this
      //調(diào)用應(yīng)用實(shí)例的方法獲取全局?jǐn)?shù)據(jù)
    app.getUserInfo(function(userInfo){
      //更新數(shù)據(jù)
      that.setData({
        userInfo:userInfo
      })
      that.update()
    })
  },
  onTouchStart: function (e) {
    this.lock.onTouchStart(e);
  },
  onTouchMove: function (e) {
    this.lock.onTouchMove(e);
  },
  onTouchEnd: function (e) {
    this.lock.onTouchEnd(e);
  }

以上是微信小程序開(kāi)發(fā)之手勢(shì)解鎖代碼實(shí)例的詳細(xì)內(nèi)容。更多信息請(qǐng)關(guān)注PHP中文網(wǎng)其他相關(guān)文章！