微信小程序保存图片功能实现

小程序保存图片功能实现

wxml:

<view class="previewImage" style="display:{{previewImage}}" bindtap="closePrev">
    <image src="{{img.url}}" mode="aspectFit" style="width:100%;height:100%;" catchlongtap="saveImg"></image>
</view>
<action-sheet hidden="{{saveImage}}" bindchange="actionSheetChange">
    <block>
        <action-sheet-item class="item" bindtap="downloadFile" data-image-href="{{img.url}}">保存图片</action-sheet-item>
    </block>
    <action-sheet-cancel class="cancel">取消</action-sheet-cancel>
</action-sheet>

wxss:

.previewImage{
    position: absolute;
    top:;
    left:;
    width: 100%;
    height: 100%;
    background-color: #000;
}

js:

    previewImg:function(){
        this.setData({
            previewImage:"block"
        });
    },
    saveImg:function(){
        longTouch = true;
        this.setData({
            saveImage:false
        })
    },
    closePrev:function(){
        if(longTouch){
            longTouch = false;
        }else{
            this.setData({
                previewImage:"none"
            });
        }
    },
    actionSheetChange:function(){
        this.setData({
            saveImage:!this.data.saveImage
        })
    },
    downloadFile:function(e){
        var imgUrl = e.currentTarget.dataset.imageHref;
        var that = this;
        wx.downloadFile({
              url: imgUrl,
              type: 'image',
              success:function(res){
                  var tempFilePath = res.tempFilePath;
                console.log(tempFilePath);
                wx.saveFile({
                      tempFilePath:tempFilePath,
                      success:function(res){
                        var savedFilePath = res.savedFilePath;
                        console.log(savedFilePath);
                        that.setData({
                            saveImage:true
                        });
                      },
                      fail:function(res){
                          console.log(res);
                      }
                });
              },
              fail:function(res){
                  console.log(res);
              }
        });
    }