fix(app): canvasToTempFilePath fixed #2970

packages/uni-app-plus/src/platform/index.ts

@@ -15,15 +15,11 @@ export {
   removeMediaQueryObserver,
 } from '../service/api/ui/mediaQueryObserver'
 
-export function saveImage(
-  base64: string,
-  dirname: string,
-  callback: (error: Error | null, tempFilePath: string) => void
-) {}
+export { saveImage } from './saveImage'
 export function getSameOriginUrl(url: string): Promise<string> {
   return Promise.resolve(url)
 }
-export const TEMP_PATH = ''
+export { TEMP_PATH } from '../service/api/constants'
 
 export {
   getEnterOptions,

packages/uni-app-plus/src/platform/saveImage.ts

+let index = 0
+
+type Format = 'jpg' | 'png' | undefined
+
+export function saveImage(
+  base64: string,
+  dirname: string,
+  callback: (error: Error | null, tempFilePath?: string) => void
+) {
+  const id = `${Date.now()}${index++}`
+  const bitmap = new plus.nativeObj.Bitmap!(`bitmap${id}`)
+  bitmap.loadBase64Data(
+    base64,
+    function () {
+      const base64Match = base64.match(/data:image\/(\S+?);/) || [null, 'png']
+      let format
+      if (base64Match[1]) {
+        format = base64Match[1].replace('jpeg', 'jpg') as Format
+      }
+      const tempFilePath = `${dirname}/${id}.${format}`
+      bitmap.save(
+        tempFilePath,
+        {
+          overwrite: true,
+          quality: 100,
+          format,
+        },
+        function () {
+          clear()
+          callback(null, tempFilePath)
+        },
+        function (error) {
+          clear()
+          callback(error)
+        }
+      )
+    },
+    function (error) {
+      clear()
+      callback(error)
+    }
+  )
+
+  function clear() {
+    bitmap.clear()
+  }
+}