小程序之点击下载图片到本地
话不多说直接上代码
<template>
<view class="cart-ticket full-height full-width">
<!-- 轮播图 -->
<swiper v-if="brandList.length > 0" :indicator-dots="true" :autoplay="false" :interval="3000" :duration="1000"
class="swiper" indicator-color="#ff9900" indicator-active-color="#ffffff" :current="currentId" @change="swiperChange" >
<swiper-item v-for="(img, index) in brandList" :key="index" class="swiper-item">
<image :src="img.posterImg" mode="aspectFill" class="full-height full-width"></image>
</swiper-item>
</swiper>
<button v-if="!isAuthSavePhoto" @tap="onSaveToPhone" style="background: #294D7C;
border-radius: 40upx; text-align: center; color: #ffffff; width: 50%; margin: auto; position: absolute; top: 90%; left: 50%;transform: translate(-50%,-50%);" >
保存图片到手机
</button>
<button v-if="isAuthSavePhoto" @tap="showModal" style="background: #294D7C;
border-radius: 40upx; text-align: center; color: #ffffff; " >
保存图片到手机
</button>
</view>
</template>
<script>
import couponService from \'@/service/CouponService\';
export default {
components: {
},
computed: {
},
data() {
return {
photoUrl: "https://cz-mall.oss-cn-shenzhen.aliyuncs.com/mall/images/null/20200324/1585041343359vp2.png",
isAuthSavePhoto: false,
brandList:[]
};
},
methods: {
swiperChange(e){
var index=e.target.current || e.detail.current;
console.log(index)
this.photoUrl = this.brandList[index].posterImg
},
// 保存图片到手机
onSaveToPhone() {
if (this.photoUrl.indexOf("https") < 0) {
this.photoUrl = this.photoUrl.replace("http:", "https:");
}
console.log(this.photoUrl)
this.getSetting().then((res) => {
// 判断用户是否授权了保存到本地的权限
if (!res.authSetting[\'scope.writePhotosAlbum\']) {
this.authorize().then(() => {
this.savedownloadFile(this.photoUrl)
// this.setData({
// isAuthSavePhoto: false
// })
this.isAuthSavePhoto = false
}).catch(() => {
wx.showToast({
title: \'您拒绝了授权\',
icon: \'none\',
duration: 1500
})
this.isAuthSavePhoto = true
// this.setData({
// isAuthSavePhoto: true
// })
})
} else {
this.savedownloadFile(this.photoUrl)
}
})
},
//打开设置，引导用户授权
onOpenSetting() {
wx.openSetting({
success: (res) => {
console.log(res.authSetting)
if (!res.authSetting[\'scope.writePhotosAlbum\']) {
wx.showToast({
title: \'您未授权\',
icon: \'none\',
duration: 1500
})
this.isAuthSavePhoto = true
} else {// 接受授权
this.isAuthSavePhoto = false
this.onSaveToPhone() // 接受授权后保存图片
}
}
})
},
// 获取用户已经授予了哪些权限
getSetting() {
return new Promise((resolve, reject) => {
wx.getSetting({
success: res => {
resolve(res)
}
})
})
},
// 发起首次授权请求
authorize() {
return new Promise((resolve, reject) => {
wx.authorize({
scope: \'scope.writePhotosAlbum\',
success: () => {
resolve()
},
fail: res => { //这里是用户拒绝授权后的回调
console.log(\'拒绝授权\')
reject()
}
})
})
},
savedownloadFile(img) {
wx.showLoading({
title: \'保存中...\',
mask: true,
});
wx.downloadFile({
url:img,
success: function(res) {
wx.showToast({
title: res,
icon: \'success\',
duration: 2000
});
console.log(res)
if (res.statusCode === 200) {
let img = res.tempFilePath;
wx.saveImageToPhotosAlbum({
filePath: img,
success(res) {
wx.showToast({
title: \'保存成功\',
icon: \'success\',
duration: 2000
});
},
fail(res) {
wx.showToast({
title: \'保存失败\',
icon: \'success\',
duration: 2000
});
}
});
}
}
})
// this.downLoadFile(img).then((res) => {
// return this.saveImageToPhotosAlbum(res.tempFilePath)
// }).then(() => {
// })
},
//单文件下载(下载文件资源到本地)，客户端直接发起一个 HTTPS GET 请求，返回文件的本地临时路径。
downLoadFile(img) {
return new Promise((resolve, reject) => {
wx.downloadFile({
url: img,
success: (res) => {
console.log(\'downloadfile\', res)
resolve(res)
}
})
})
},
// 保存图片到系统相册
saveImageToPhotosAlbum(saveUrl) {
return new Promise((resolve, reject) => {
wx.saveImageToPhotosAlbum({
filePath: saveUrl,
success: (res) => {
wx.showToast({
title: \'保存成功\',
duration: 1000,
})
resolve()
}
})
})
},
// 弹出模态框提示用户是否要去设置页授权
showModal() {
wx.showModal({
title: \'检测到您没有打开保存到相册的权限，是否前往设置打开？\',
success: (res) => {
if (res.confirm) {
console.log(\'用户点击确定\')
this.onOpenSetting() // 打开设置页面
} else if (res.cancel) {
console.log(\'用户点击取消\')
}
}
})
},
loadData() {}
},
onLoad(options) {
// 海报列表
couponService.getAllPoster({}).then(result => {
this.brandList = result.list
this.photoUrl = result.list[0].posterImg
}).catch(err=> {
console.log(err)
});
}
};
</script>
<style lang="scss">
page{
position: relative;
width: 100%;
height: 100%;
// 轮播图
.swiper {
height: 100%;
margin: 0upx;
width: 100%;
image {
width: 100%;
}
}
.cart-ticket{
width: 100%;
height: 100%;
background: #ffffff;
}
.save_btn{
font-size: 30rpx;
line-height: 72rpx;
color: #fff;
width:100%;
height:100%;
text-align: center;
border-radius: 36rpx;
z-index: 10;
background: #294D7C;
}
}
</style>
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