Obj-C wrapper method for, File Manager API, to overwrite a file.

NSFileManager+FRBMethods.h

@interface NSFileManager (FRBMethods) 
- (BOOL)overwriteFileAtPath:(NSString *)src toPath:(NSString *)dst;
@end

NSFileManager+FRBMethods.m

@implementation NSFileManager (FRBMethods)
- (BOOL)overwriteFileAtPath:(NSString *)src toPath:(NSString *)dst
{
  FSRef dstRef; // <= should be the destination path with no filename
  FSRef srcRef; // <= should be the source path with filename
  OSStatus err;
  
  err = FSPathMakeRefWithOptions((UInt8 *)[[dst stringByDeletingLastPathComponent] fileSystemRepresentation], kFSPathMakeRefDoNotFollowLeafSymlink, &dstRef, NULL);
  if (err != noErr) {
    NSLog(@"* Error with dst, FSPathMakeRefWithOptions: %d", err);
    return NO;
  }
  
  err = FSPathMakeRefWithOptions((UInt8 *)[src fileSystemRepresentation], kFSPathMakeRefDoNotFollowLeafSymlink, &srcRef, NULL);
  if (err != noErr) {
    NSLog(@"* Error with src, FSPathMakeRefWithOptions: %d", err);
    return NO;
  }
  
  err = FSMoveObjectSync(&srcRef, &dstRef, (CFStringRef)[dst lastPathComponent], NULL, kFSFileOperationOverwrite);
  if (err != noErr) {
    NSLog(@"* Error with FSMoveObjectSync, %d", err);
    return NO;
  }    
  
  return YES;
}

@end