IOS文件操作

1.从cache文件夹拷贝到document文件夹

  

   

    

     

    
    

     

         NSString *sqlFile = @"test.zip";
     
    
   

    

     

    
    

     

          NSArray *cachePath= NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
     
    
   

    

     

    
    

     

          NSString *cacheDir = [cachePath objectAtIndex:0];
     
    
   

    

     

    
    

     

          NSString *databasePath = [cacheDir stringByAppendingPathComponent:sqlFile];
     
    
   

    

     

    
    

     
    NSLog(databasePath);
     
    
   

    

     

    
    

     
    
     
    
   

    

     

    
    

     

          NSFileManager *fileManager = [NSFileManager defaultManager];
     
    
   

    

     

    
    

     
    // Copy the database sql file from the resourcepath to the documentpath
     
    
   

    

     

    
    

     
    if ([fileManager fileExistsAtPath:databasePath])
     
    
   

    

     

    
    

     

          {
     
    
   

    

     

    
    

     
        //NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:sqlFile];
     
    
   

    

     

    
    

     

              NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
     
    
   

    

     

    
    

     

              NSString *documentpath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
     
    
   

    

     

    
    

     

              NSString* databasePathFromApp = [documentpath stringByAppendingString:@"/test.zip"] ;
     
    
   

    

     

    
    

     
        NSLog(databasePathFromApp);
     
    
   

    

     

    
    

     

              NSError *error;
     
    
   

    

     

    
    

     

              [fileManager copyItemAtPath:databasePath toPath:databasePathFromApp error:&error];
     
    
   

    

     

    
    

     
        // if (error != nil) {
     
    
   

    

     

    
    

     
        // NSLog(@"[Database:Error] %@", error);
     
    
   

    

     

    
    

     
        // }
     
    
   

    

     

    
    

     

          }
     
    
  
 

  
 
 

2.从document文件夹拷贝到cache文件夹

  

   

    

     

    
    

     

      NSString *sqlFile = @"qxd.db";  
     
    
   

    

     

    
    

     

          NSArray *cachePath= NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);  
     
    
   

    

     

    
    

     

          NSString *cacheDir = [cachePath objectAtIndex:0];  
     
    
   

    

     

    
    

     

          NSString *databasePath = [cacheDir stringByAppendingPathComponent:sqlFile];  
     
    
   

    

     

    
    

     
      
     
    
   

    

     

    
    

     
      
     
    
   

    

     

    
    

     

          NSFileManager *fileManager = [NSFileManager defaultManager];  
     
    
   

    

     

    
    

     
    // Copy the database sql file from the resourcepath to the documentpath 
     
    
   

    

     

    
    

     
    if (![fileManager fileExistsAtPath:databasePath]) {  
     
    
   

    

     

    
    

     

              NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:sqlFile];  
     
    
   

    

     

    
    

     

              NSError *error;  
     
    
   

    

     

    
    

     

              [fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:&error];  
     
    
   

    

     

    
    

     

      // if (error != nil) { 
     
    
   

    

     

    
    

     

      // NSLog(@"[Database:Error] %@", error); 
     
    
   

    

     

    
    

     

      // } 
     
    
   

    

     

    
    

     

          }  
     
    
  
 

  
 
 

文章来源: zzzili.blog.csdn.net，作者：清雨小竹，版权归原作者所有，如需转载，请联系作者。

原文链接：zzzili.blog.csdn.net/article/details/8424125