How to avoid overwriting files on iPhone Documents folder? - iphone

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;
}

Answer 2

UIImage *imageForShare = [UIImage imageNamed:#"anyImage.jpg"];
NSString *stringPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:#"New Folder"];
// New Folder is your folder name
NSError *error = nil;
//in this method you are checking the path is exist or not for Folder Name
if (![[NSFileManager defaultManager] fileExistsAtPath:stringPath])
[[NSFileManager defaultManager] createDirectoryAtPath:stringPath withIntermediateDirectories:NO attributes:nil error:&error];
//now checking the image name already exist or not
NSString *fileName = [stringPath stringByAppendingFormat:#"/image.jpg"];
if (![[NSFileManager defaultManager] fileExistsAtPath:fileName])
{
NSLog(#"Path is available.");
NSData *data = UIImageJPEGRepresentation(imageForShare, 1.0);
[data writeToFile:fileName atomically:YES];
}
else
{
NSLog(#"Path doesn't exist, same name of image is already exist.");
}
Thank You!!