在h5页面使用dom-to-image将DOM元素生成的base64图片这个DOM有包含文字 背景图 和一些贴图 通过wx.saveImageToPhotosAlbum保存图片到手机 安卓和模拟器一切正常  ios手机保存到手机后 保存下来的图片无背景图 这个图片里面的图片也都不见了

这是安卓

ios

贴一下代码

onLoad(options) {
        wx.getFileSystemManager().writeFile({
            filePath: wx.env.USER_DATA_PATH + "/qrcode.png",
            data: this.padStringToMultipleOfFour(options.base64.replace("data:image/png;base64,", "")),
            encoding: "base64",
            success: (res) => {
                console.log(res);
                wx.saveImageToPhotosAlbum({
                    filePath: wx.env.USER_DATA_PATH + "/qrcode.png", //这是把临时文件 保存到 相册, 收工
                    success: (res) => {
                        wx.showToast({
                            title: "保存成功 请打开相册查看",
                            icon: "none"
                        });
                        setTimeout(() => {
                            wx.navigateBack({
                                delta: 1
                            })
                        }, 1500)
                    },
                    fail: (error) => {
                        console.log(1, error);
                        wx.showToast({
                            title: "保存失败 请截图保存",
                            icon: "none"
                        });
                        setTimeout(() => {
                            wx.navigateBack({
                                delta: 1
                            })
                        }, 1500)
                    },
                });
            },
            fail: (error) => {
                console.log(2, error);
                wx.showToast({
                    title: "保存失败 请截图保存",
                    icon: "none"
                });
                setTimeout(() => {
                    wx.navigateBack({
                        delta: 1
                    })
                }, 1500)
            },
        });
    },


    /**
     * 补充base64的长度 变为4的倍数 要不ios不识别
     * @param {*} str 
     */
    padStringToMultipleOfFour(str) {
        const length = str.length;
        const remainder = length % 4;
        if (remainder !== 0) {
            const padding = 4 - remainder;
            str += '='.repeat(padding);
        }
        return str;
    },