如何使用 Objective-C 从 IOS Cordova 中的设备（本地数据库）中删除图像

Posted 2023-03-15

【中文标题】如何使用 Objective-C 从 IOS Cordova 中的设备（本地数据库）中删除图像

【英文标题】：How to delete a image from Device (Local DB) in IOS Cordova using Objective-C

【发布时间】：2016-03-04 06:35:23

【问题描述】：

我正在开发 iOS - Cordova 跨平台。

我正在使用以下代码从 javascript 端获取图像路径 -

 NSString *fileName =[command argumentAtIndex:0];

我想使用 Objective-c 从此图像路径中删除图像。

我该怎么办？请帮忙

谢谢

【参考方案1】：

你应该可以这样做：

NSString *fileName = [command argumentAtIndex:0];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@", fileName]];
[fileManager removeItemAtPath:filePath error:NULL];

【讨论】：

谢谢，如果我想将 Base64 转换为 Path，我应该怎么做？请帮助@gvuksic

@kishor iosdevelopertips.com/core-services/…

我从 [command argumentAtIndex:0] 获取 Base64；那么如何将其转换为路径？我试过但它不起作用。请帮忙

您正在获取 base64 数据？ NSString *fileName = [[NSString alloc] initWithData:[command argumentAtIndex:0] encoding:NSUTF8StringEncoding];

@kishor NSString *fileName = [[NSString alloc] initWithData:[[NSData alloc] initWithBase64EncodedString:[command argumentAtIndex:0] options:0] encoding:NSUTF8StringEncoding];

【参考方案2】：

 -(void)deleteImageFromDevice:(CDVInvokedUrlCommand*)command
 
   @try
   
       //File Name Getting from JS side
       NSString *fileName = [command argumentAtIndex:0];

      //Make a component Sepratation of File Name
      NSArray *items = [fileName componentsSeparatedByString:@"/"];

      //Get File(Image) At last index
      NSString* FileAtLastIndex =[items objectAtIndex:([items count]-1)];

      //creating file manager
      NSFileManager *fileManager = [NSFileManager defaultManager];

      //Create a Local Path
      NSString *documentPath =[NSSearchPathForDirectoriesInDomains
                              (NSDocumentDirectory, NSUserDomainMask, YES)
                              objectAtIndex:0];

     //Appending the IconImages Folder In Local Path
     NSString *filePath = [documentPath
                          stringByAppendingPathComponent:@"IconImages"];

      //Appending The File(Image), we get it from array Last index
      NSString *filePathAtLastIndex =
                [filePath stringByAppendingPathComponent:FileAtLastIndex];

      NSError *error=nil;

      //Checking that File is removed or Not.
      BOOL success =
            [fileManager removeItemAtPath:filePathAtLastIndex error:&error];

      //If file is Removed
        if (!success)
        
          NSLog(@"Could not delete file -:%@ ",[error localizedDescription]);
        
     
  @catch(NSException *exception)
  
      NSLog(@"DeleteImageFromDevice exception %@",exception);