点击手势代码（点击手势图标）

本篇文章给大家谈谈点击手势代码，以及点击手势图标对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。

本文目录一览：

• 1、如何给一个uiscrollview添加手势
• 2、获取手势点击哪个控件 UIGestureRecognizer
• 3、前端怎么实现点击图片将图片放大而且图片可以手势随意缩放，最好附上代码，非常感谢
• 4、如何用微信小程序开发手势解锁

如何给一个uiscrollview添加手势

单指双击实例代码：

UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(doDoubleTap)];

doubleTap.numberOfTapsRequired = 2;

doubleTap.numberOfTouchesRequired = 1;

[self.view addGestureRecognizer:doubleTap];

~如果你认可我的回答，请及时点击【采纳为满意回答】按钮

~~手机提问的朋友在客户端右上角评价点【满意】即可。

获取手势点击哪个控件 UIGestureRecognizer

给图片增加UIGestureRecognizer 手势的时候 ，因为图片是动态增加的，一开始不知道如何确定自己点在哪个控件上。

后来各种试，终于明白了。。。

代码如下

UIGestureRecognizer* singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageTouch:)]; // 创建手势

[myImage addGestureRecognizer:singleTap];// 在图片上增加手势

myImage.tag = 100;// 给图片增加一个唯一标识

- (void)imageTouch:(UITapGestureRecognizer * )sender

{

NSLog(@"%@",sender.self.view);// 这个view 就是点击的那个控件

}

前端怎么实现点击图片将图片放大而且图片可以手势随意缩放，最好附上代码，非常感谢

如果说的是在 web 里，有个叫做 hammer.js 的插件，官方有示例的，可以看看。

如何用微信小程序开发手势解锁

整个功能基于canvas实现，首先添加画布组件，并设定样式

!--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;

}123456789101112

手势解锁实现代码在gesture_lock.js中(完整源码地址见末尾)。

初始化

constructor(canvasid, context, cb, opt){ this.touchPoints = []; this.checkPoints = []; this.canvasid = canvasid; this.ctx = context; this.width = opt opt.width || 300; //画布长度

this.height = opt opt.height || 300; //画布宽度

this.cycleNum = opt opt.cycleNum || 3; this.radius = 0; //触摸点半径

this.isParamOk = false; this.marge = this.margeCircle = 25; //触摸点及触摸点和画布边界间隔

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) { // 计算触摸点的半径长度

this.radius = (this.width - this.marge * 2 - (this.margeCircle * (this.cycleNum - 1))) / (this.cycleNum * 2) this.radius = Math.floor(this.radius); // 计算每个触摸点的圆心位置

this.calCircleParams();

} this.onEnd = cb; //滑动手势结束时的回调函数

}1234567891011121314151617181920212223242526

主要设置一些参数，如canvas的长宽，canvas的context，手势锁的个数(3乘3, 4乘4)，手势锁的颜色，手势滑动结束时的回调函数等。并计算出手势锁的半径。

计算每个手势锁的圆心位置

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)

}

}

}1234567891011121314151617

绘制手势锁

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);1234

接下来就是识别用户的滑动行为，判断用户划过了哪些圆圈，进而识别出用户的手势。

在touchstart和touchmove事件中检测触发并更新画布

onTouchStart(e) { // 不识别多点触控

if (e.touches.length 1){ this.touchState = "unTouch"; return;

} this.touchState = "startTouch"; this.checkTouch(e); let point = {x:e.touches[0].x, y:e.touches[0].y}; this.drawCanvas(this.checkColor, point);

}

onTouchMove(e) { if (e.touchState === "unTouch") { return;

} if (e.touches.length 1){ this.touchState = "unTouch"; return;

} this.checkTouch(e); let point = {x:e.touches[0].x, y:e.touches[0].y}; this.drawCanvas(this.checkColor, point);

}123456789101112131415161718192021222324

检测用户是否划过某个圆圈

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 === 'uncheck') { this.checkPoints.push(point); this.lastCheckPoint = point;

}

point.check = "check"

return;

}

}

}12345678910111213

更新画布

drawCanvas(color, point) { //每次更新之前先清空画布

this.ctx.clearRect(0, 0, this.width, this.height); //使用不同颜色和形式绘制已触发和未触发的锁

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)

}

} //绘制已识别锁之间的线段

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];

}

} //绘制最后一个识别锁和当前触摸点之间的线段

if (this.lastCheckPoint point) { this.drawLine(this.lastCheckPoint, point, color);

} this.ctx.draw(true);

}12345678910111213141516171819202122232425262728

当用户滑动结束时调用回调函数并传递识别出的手势

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

}

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

}1234567

重置和显示手势错误

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

}

reset() { for (let i = 0; i this.touchPoints.length; i++) { this.touchPoints[i].check = 'uncheck';

} this.checkPoints = []; this.lastCheckPoint = null; this.drawCanvas(this.initColor);

}123456789101112

如何调用

在onload方法中创建lock对象并在用户触摸事件中调用相应方法

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

//调用应用实例的方法获取全局数据

app.getUserInfo(function(userInfo){

//更新数据

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);

}

点击手势代码的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于点击手势图标、点击手势代码的信息别忘了在本站进行查找喔。