iOS编程中将Base64图片转换为文件路径图片答案

【问题标题】：Convert Base64 image to file path image in iOS programmingiOS编程中将Base64图片转换为文件路径图片
【发布时间】：2016-03-10 19:23:44
【问题描述】：

我正在使用从 base64 到字符串的转换，而我需要它作为 iOS 本机插件中的图像文件路径

在 android 中这样的东西将位图转换为文件我需要在 iOS 中替代它

 private String convertBitmapToFile(Bitmap photo)

由于我的base64到字符串的代码转换没有调用回调方法“profileBase64Callback”

 plugin call://here citizen.profileImage is in base64 format
 myPlugin.convertToFile("profileBase64Callback", citizen.profileImage,  function(){ }, function(){ });

Nativeplugin.m

 - (void)convertToFile:(CDVInvokedUrlCommand *)command{
      NSDictionary* options = [[NSDictionary alloc]init];
      if ([command.arguments count] > 0) {
          options = [command argumentAtIndex:0];
          NSString *base64Data =[options objectForKey:@"base64"];
          NSLog(@"strttrtr :%@", base64Data);
    }

      NSData* data = [[NSData alloc] initWithBase64EncodedString: base64Data options:0];
      NSString *strCOnvert = [NSString base64StringFromData:data length:[data length]];//Instead of this string I want decoded format(file path) to send to javascript Or if any other format which fixes my issue


   dispatch_async(dispatch_get_main_queue(), ^{
    CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsString:strCOnvert];
    [pluginResult setKeepCallbackAsBool:true];
    [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];      
    NSString * jsCallBack = [NSString stringWithFormat:@"%@(%@);", @"profileBase64Callback", strCOnvert];
    [self.webView stringByEvaluatingJavaScriptFromString:jsCallBack];

});

调用一个javascript方法来执行：

         //Need this imageURI after conversion which I am unable to convert
        function profileBase64Callback(imageURI){
             console.log("profileImage path " );
            //updating to database
             updateCitizenValue("profileImage", imageURI);
             setTimeout(getCitizen(function(citizenVal){

          }), 5000);
 }//this method is not called due to error in conversion.

谁能告诉我我哪里出错了..尝试将base64格式的图像解码为实际文件

【问题讨论】：

如果我在 NSString * jsCallBack = [NSString stringWithFormat:@"%@(%@);", @"profileBase64Callback", @""]; 中发送空数据而不是上面代码中的 strCONvert ，而不是我的回调方法被称为 as..console==citizenVal.profileImage : undefined

标签： javascript ios base64 decode cordova-plugins

【解决方案1】：

以下代码解决了我的问题：

- (void)convertToFile:(CDVInvokedUrlCommand *)command{

    NSDictionary* options = [[NSDictionary alloc]init];
    NSString *base64String;
    if ([command.arguments count] > 0) {
        options = [command argumentAtIndex:0];
        base64String = [options objectForKey:@"base64"];
        methodname1 =[options objectForKey:@"callback"];

    }

    NSData* data = [[NSData alloc] initWithBase64EncodedString:methodname1 options:0];

   NSString  *jpgPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.png"]; 
  /*
    identify the home directory and file name
   */
  NSLog(@"----jpgPath--%@",jpgPath);
  [data writeToFile:jpgPath atomically:YES];



   /*
   Send resulting data to cordova plugin
   */
     dispatch_async(dispatch_get_main_queue(), ^{
    CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsString:@"OK"];
    [pluginResult setKeepCallbackAsBool:true];

    [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];

    NSString * jsCallBack = [NSString stringWithFormat:@"%@(%@);", @"profileBase64Callback", jpgPath];
    [self.webView stringByEvaluatingJavaScriptFromString:jsCallBack];

    });

 }

【讨论】：