[图片]右侧是一个scroll-view,里面的自定义组件中包含一个fixed弹框，但这个弹框无论怎么设置层级，只能显示在当前scroll-view的有效宽度内。安卓、开发工具都正常。ios不行、

wx.canvasToTempFilePath， 发布的版本安卓手机使用没有任何问题，生成了我们要的带水印的图片。但是苹果手机生成的是空白的图片。 我们尝试了，加计时器，缩小图片大小。都不好使。 wx.canvasToTempFilePath({                             canvas,                             success: (res) => {                                 wx.saveImageToPhotosAlbum({                                     filePath: res.tempFilePath,                                     success: (res) => {                                         wx.showToast({                                             title: '保存成功',                                             icon: 'success',                                             duration: 2000                                         })                                     },                                     fail: (res) => {                                         wx.showToast({                                             title: '保存失败',                                             icon: 'error',                                             duration: 2000                                         })                                     }                                 }) })

 changeImgPx(url: string, width: number, height: number): Promise<string> {     return new Promise((resolve, reject) => {       const query = wx.createSelectorQuery()       query.select('#js-img-ctrl-canvas')         .fields({           node: true,           size: true         })         .exec((res) => {           const canvas = res[0].node           const ctx = canvas.getContext('2d')           let img = canvas.createImage()           img.src = url           img.onload = () => {             ctx.drawImage(img, 0, 0, width, height);             setTimeout(() => {               wx.canvasToTempFilePath({                 canvas,                 destWidth: width,                 destHeight: height,                 fileType: 'jpg',                 quality: 1,                 success: (outRes) => {                   resolve(outRes.tempFilePath)                 },                 fail: (err) => {                   reject(err)                 }               })             }, 2000)           }         })     })   }, 先使用canvas2d的drawImage, 然后使用wx.canvasToTempFilePath, 就是白图. 安卓一切正常, ios不行是白图

saveImage() { var that = this const [data, w, h] = screenshot(renderer, scene, camera, WebGLRenderTarget); const ctx = helperCanvas.getContext('2d') const imgData = helperCanvas.createImageData(data, w, h); helperCanvas.height = imgData.height; helperCanvas.width = imgData.width; ctx.putImageData(imgData, 0, 0); const imgDataFromCanvas = ctx.getImageData(0, 0, w, h) const hasPixel = imgDataFromCanvas.data.some(i => i !== 0) wx.canvasToTempFilePath({ canvas: helperCanvas, success(res) { // 文件临时路径 const local_path = res.tempFilePath const url = that.goto_uploadfile(local_path); that.useing_show.image_url = url; that.add_try_log(); // that.change_load(false); }, fail(err) { console.log("错误", err); } }) },