Question

So, here’s my situation :

• I’ve got an application prompting the user to select a folder to save his files
• Now let’s say his files are : a.png, b.png, c.png

What I want is :

• if file – let’s say – a.png already exists in the selected folder, DON’T overwrite it. Instead create a file with name a (1).png. If a file a (1).png already exists, then name it like a (2).png, and so on – pretty much like OS X does when copy-pasting files with the same name.

This is how I’m currently doing it – but it still doesn’t strike me ok :

NSString* target = [self getTargetPathForFile:filename path:folder];

NSString* fname = [target lastPathComponent];

while ([[NSFileManager defaultManager] fileExistsAtPath: [folder stringByAppendingPathComponent:fname]])
{
    //NSLog(@"FNAME : %@",fname);

    if ([self str:fname containsString:@")." options:nil])
    {
        NSArray* a = [fname componentsSeparatedByString:@"("];
        NSArray* b = [[a objectAtIndex:1] componentsSeparatedByString:@")"];

        fname = [NSString stringWithFormat:@"%@(%d)%@",[a objectAtIndex:0],[[b objectAtIndex:0] intValue]+1,[b objectAtIndex:1]];
    }
    else
    {
        fname = [NSString stringWithFormat:@"%@ (1).%@",[fname stringByDeletingPathExtension],[fname pathExtension]];
    }

    //NSLog(@"Setting filename to :: %@",fname);
}
target = [folder stringByAppendingPathComponent:fname];

Any ideas how to go about this? Is there any Cocoa-friendly (or built-in) method for this?

Answer 1

Why not try this one :

NSString* fname = [target lastPathComponent];
NSString* fnameNoExt = [fname stringByDeletingPathExtension];
NSString* extension = [fname pathExtension];

int fileIndex = 1;
while ([[NSFileManager defaultManager] fileExistsAtPath: [folder stringByAppendingPathComponent:fname]])
{
    //NSLog(@"FNAME : %@",fname);
    fname = [NSString stringWithFormat:@"%@ (%d).%@", fnameNoExt, fileIndex, extension];
    //NSLog(@"Setting filename to :: %@",fname);
    fileIndex++;
}
target = [folder stringByAppendingPathComponent:fname];