新接了一个做微信小程序的活,编码方式跟vue很相似,样式编写比普通css样式轻松的多,现要实现一个轮播图的效果。
请教了我的同学,她说小程序有两种方法能实现这个效果:
- 小程序自带的swiper组件,然后自己改样式;
- view,touchstart,touchmove,touchend事件和动画自己写。
现在就分别来搞一下这个轮播~
方法一:小程序自带的swiper组件
微信小程序—swiper组件文档
wxml文件:
<swiper interval="{{interval}}" duration="{{duration}}" display-multiple-items="{{displayMultipleItems}}" previous-margin="{{previousMargin}}" next-margin="{{nextMargin}}">
<block wx:for="{{imgUrls}}" wx:for-index="current">
<swiper-item class="swiper-image">
<image src="{{item}}" id="swiper{{current}}" class="slide-image" width="355" height="150"/>
</swiper-item>
</block>
</swiper>
js文件:
Page({
data: {
imgUrls: [
'http://img02.tooopen.com/images/20150928/tooopen_sy_143912755726.jpg',
'http://img06.tooopen.com/images/20160818/tooopen_sy_175866434296.jpg',
'http://img06.tooopen.com/images/20160818/tooopen_sy_175833047715.jpg'
],
displayMultipleItems:1,
duration: 500, // 滑动动画时长
previousMargin: 30,
nextMargin:30
}
})
法一实现出来的效果图是酱紫的:
方法二:用事件和动画自己写轮播
wxml文件:
<view style="white-space: nowrap;" class="box" bindtouchstart="touchstart" bindtouchmove="touchmove" bindtouchend="touchend">
<view class="club" animation="{{animation1}}" bindtap="scrollLeft">
<image src="{{clubs[0].image}}"/>
<text>{{clubs[0].name}}</text>
</view>
<view class="club" animation="{{animation2}}" bindtap="scrollLeft">
<image src="{{clubs[1].image}}"/>
<text>{{clubs[1].name}}</text>
</view>
<view class="club" animation="{{animation3}}">
<image src="{{clubs[2].image}}"/>
<text>{{clubs[2].name}}</text>
</view>
<view class="club" animation="{{animation4}}" bindtap="scrollRight">
<image src="{{clubs[3].image}}"/>
<text>{{clubs[3].name}}</text>
</view>
<view class="club" animation="{{animation5}}" bindtap="scrollRight">
<image src="{{clubs[4].image}}"/>
<text>{{clubs[4].name}}</text>
</view>
</view>
js文件:
//index.js
//获取应用实例
const app = getApp()
Page({
data: {
clubs: [{
image: 'imgs/1.jpg',
name:'111'
},{
image: 'imgs/2.jpg',
name: '222'
}, {
image: 'imgs/3.jpg',
name: '333'
}, {
image: 'imgs/4.jpg',
name: '444'
}, {
image: 'imgs/5.jpg',
name: '555'
}]
},
//触摸开始事件
touchstart: function (e) {
console.log(e.touches[0].pageX);
this.data.touchDot = e.touches[0].pageX;
var that = this;
this.data.interval = setInterval(function () {
that.data.time += 1;
}, 100);
},
//触摸移动事件
touchmove: function (e) {
let touchMove = e.touches[0].pageX;
let touchDot = this.data.touchDot;
let time = this.data.time;
console.log("touchMove: " + touchMove + ", touchDot: " + touchDot + ", diff: " + (touchMove - touchDot));
//向左滑动
if (touchMove - touchDot <= -40 && time < 10 && !this.data.done) {
console.log("向左滑动");
this.data.done = true;
this.scrollLeft();
}
//向右滑动
if (touchMove - touchDot >= 40 && time < 10 && !this.data.done) {
console.log("向右滑动");
this.data.done = true;
this.scrollRight();
}
},
//触摸结束事件
touchend: function (e) {
clearInterval(this.data.interval);
this.data.time = 0;
this.data.done = false;
},
//向左滑动事件
scrollLeft() {
var animation1 = wx.createAnimation({
duration: 300,
timingFunction: "linear",
delay: 0
})
var animation2 = wx.createAnimation({
duration: 300,
timingFunction: "linear",
delay: 0
})
var animation3 = wx.createAnimation({
duration: 300,
timingFunction: "linear",
delay: 0
})
var animation4 = wx.createAnimation({
duration: 300,
timingFunction: "linear",
delay: 0
})
var animation5 = wx.createAnimation({
duration: 300,
timingFunction: "linear",
delay: 0
})
this.animation1 = animation1;
this.animation2 = animation2;
this.animation3 = animation3;
this.animation4 = animation4;
this.animation5 = animation5;
this.animation1.translateX(-60).opacity(0).step();
this.animation2.translateX(-140).opacity(0.5).scale(0.8, 0.8).step();
this.animation3.translateX(-110).opacity(0.5).scale(1, 1).step();
this.animation4.translateX(-70).opacity(1).scale(1.4, 1.4).step();
this.animation5.translateX(-30).opacity(0.5).scale(1, 1).step();
this.setData({
animation1: animation1.export(),
animation2: animation2.export(),
animation3: animation3.export(),
animation4: animation4.export(),
animation5: animation5.export()
})
var that = this;
setTimeout(function () {
that.animation1.translateX(-50).opacity(0.2).scale(0.8, 0.8).step({ duration: 0, timingFunction: 'linear' });
that.animation2.translateX(-40).opacity(0.5).scale(1, 1).step({ duration: 0, timingFunction: 'linear' });
that.animation3.translateX(0).opacity(1).scale(1.4, 1.4).step({ duration: 0, timingFunction: 'linear' });
that.animation4.translateX(40).opacity(0.5).scale(1, 1).step({ duration: 0, timingFunction: 'linear' });
that.animation5.translateX(50).opacity(0.2).scale(0.8, 0.8).step({ duration: 0, timingFunction: 'linear' });
that.setData({
animation1: animation1.export(),
animation2: animation2.export(),
animation3: animation3.export(),
animation4: animation4.export(),
animation5: animation5.export()
})
}.bind(this), 195)
let array = this.data.clubs;
let shift = array.shift();
array.push(shift);
setTimeout(function () {
this.setData({
clubs: array
})
}.bind(this), 195)
},
//向右滑动事件
scrollRight() {
var animation1 = wx.createAnimation({
duration: 300,
timingFunction: "linear",
delay: 0
})
var animation2 = wx.createAnimation({
duration: 300,
timingFunction: "linear",
delay: 0
})
var animation3 = wx.createAnimation({
duration: 300,
timingFunction: "linear",
delay: 0
})
var animation4 = wx.createAnimation({
duration: 300,
timingFunction: "linear",
delay: 0
})
var animation5 = wx.createAnimation({
duration: 300,
timingFunction: "linear",
delay: 0
})
this.animation1 = animation1;
this.animation2 = animation2;
this.animation3 = animation3;
this.animation4 = animation4;
this.animation5 = animation5;
this.animation1.translateX(30).opacity(0.5).scale(1, 1).step();
this.animation2.translateX(70).opacity(1).scale(1.4, 1.4).step();
this.animation3.translateX(110).opacity(0.5).scale(1, 1).step();
this.animation4.translateX(120).opacity(0.2).scale(0.8, 0.8).step();
this.animation5.translateX(130).opacity(0).step();
this.setData({
animation1: animation1.export(),
animation2: animation2.export(),
animation3: animation3.export(),
animation4: animation4.export(),
animation5: animation5.export()
})
var that = this;
setTimeout(function () {
that.animation1.translateX(-50).opacity(0.2).scale(0.8, 0.8).step({ duration: 0, timingFunction: 'linear' });
that.animation2.translateX(-40).opacity(0.5).scale(1, 1).step({ duration: 0, timingFunction: 'linear' });
that.animation3.translateX(0).opacity(1).scale(1.4, 1.4).step({ duration: 0, timingFunction: 'linear' });
that.animation4.translateX(40).opacity(0.5).scale(1, 1).step({ duration: 0, timingFunction: 'linear' });
that.animation5.translateX(50).opacity(0.2).scale(0.8, 0.8).step({ duration: 0, timingFunction: 'linear' });
that.setData({
animation1: animation1.export(),
animation2: animation2.export(),
animation3: animation3.export(),
animation4: animation4.export(),
animation5: animation5.export()
})
}.bind(this), 195)
let array = this.data.clubs;
let pop = array.pop();
array.unshift(pop);
setTimeout(function () {
this.setData({
clubs: array
})
}.bind(this), 195)
}
})
wxss文件:
.box {
height: 340rpx;
z-index: 0;
margin: 50rpx 0;
}
.box .club {
height: 140rpx;
width: 140rpx;
position: relative;
display: inline-block;
}
.club image {
height: 140rpx;
width: 140rpx;
}
.club text {
display: block;
width: 100%;
font-size: 24rpx;
line-height: 40rpx;
text-align: center;
}
.box .club:nth-child(1) {
transform: scale(0.8, 0.8) translateX(-120rpx);
opacity: 0.2;
z-index: 10;
}
.box .club:nth-child(2) {
transform: scale(1,1) translateX(-80rpx);
opacity: 0.5;
z-index: 100;
}
.box .club:nth-child(3) {
transform: scale(1.4,1.4);
z-index: 1000;
}
.box .club:nth-child(4) {
transform: scale(1,1) translateX(80rpx);
opacity: 0.5;
z-index: 100;
}
.box .club:nth-child(5) {
transform: scale(0.8, 0.8) translateX(120rpx);
opacity: 0.2;
z-index: 10;
}
.box .club:nth-child(1) text,
.box .club:nth-child(2) text,
.box .club:nth-child(4) text,
.box .club:nth-child(5) text{
visibility: hidden;
}
用法二实现出来的效果图是酱紫的:
两种都不完美,但根据代码量及复杂程度,我准备用“法一”来写这个效果。如果不是微信小程序,用jquery写这种轮播图,有现成的swiper插件,用起来也是得心应手~ jquery+swiper实现三图轮播效果