Question

I need to write files containing NSArrays into the Documents folder of my iPhone application. Next time I need to create a new file, not overwriting the previous one.

I tried like this, but it only writes doc0 and doc1.

allDocs in an NSArray declared elsewhere.

What’s wrong? Thank you!

 NSString *myDoc;
 NSString *temp;

  for (int i = 0; i < [allDocs count]; ++i){
    NSFileManager* fileMgr = [NSFileManager defaultManager];
    myDoc = [NSString stringWithFormat:@"doc%d.dat", i];
    NSString* currentFile = [documentsDirectory stringByAppendingPathComponent:myDoc];
    BOOL fileExists = [fileMgr fileExistsAtPath:currentFile];
    if (fileExists == NO){
        temp = [NSString stringWithFormat:@"doc%d.dat", i];
        break;
    } else {
        temp = [NSString stringWithFormat:@"doc%d.dat",i++];
        break;
    }
}

NSString *myArray = [documentsDirectory stringByAppendingPathComponent:myDoc];

NSMutableArray *myMutableArray = [[NSMutableArray alloc] initWithContentsOfFile: myArray];

if(myMutableArray == nil)

{

    myMutableArray = [[NSMutableArray alloc] initWithCapacity:10];

    myMutableArray = anotherArray; 
} 

[myMutableArray writeToFile:myArray atomically:YES];

Answer 1

You break out of the for loop on the first iteration each time whether the file is found or not. You should be looping with incremented values for i until fileExists is false.

- (BOOL) workFileExists:(NSString *)name {
    NSFileManager *fm = [NSFileManager defaultManager];
    NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    NSString *filename = [name stringByAppendingString:@".swrk"];

    return [fm fileExistsAtPath:[path stringByAppendingPathComponent:filename]];
}

- (NSString *)uniqueUntitledName {
    NSString *untitled = @"Untitled";
    NSString *name = untitled;
    int i = 1;
    while ([self workFileExists:name]) {
        name = [NSString stringWithFormat:@"%@%d", untitled, i];
        i++;
    }
    return name;
}