NSFileManager unique file names

Question

I need a quick and easy way to store files with unique file names on iOS. I need to prefix the file with a string, and then append the generated unique identifier to the en

Answer 1

I use current date to generate random file name with a given extension. This is one of the methods in my NSFileManager category:

+ (NSString*)generateFileNameWithExtension:(NSString *)extensionString
{
    // Extenstion string is like @".png"

    NSDate *time = [NSDate date];
    NSDateFormatter* df = [NSDateFormatter new];
    [df setDateFormat:@"dd-MM-yyyy-hh-mm-ss"];
    NSString *timeString = [df stringFromDate:time];
    NSString *fileName = [NSString stringWithFormat:@"File-%@%@", timeString, extensionString];

    return fileName;
}