Utility class extension for creating random / temporary file names in one of the common directories of the current user's domain. #utility #nsstring #filename #random #objective-c

NSString+RandomFileName.h

#import <Foundation/Foundation.h>

@interface NSString (RandomFileName)

+(NSString*)randomString;
+(NSString*)randomFileNameWithExtension:(NSString*)extension;
+(NSString*)randomFileNameInDirectory:(NSSearchPathDirectory)directory withExtension:(NSString*)extension;

@end

NSString+RandomFileName.m

#import "NSString+RandomFileName.h"

@implementation NSString (RandomFileName)

+(NSString*)randomString
{
    CFUUIDRef uuid = CFUUIDCreate(kCFAllocatorDefault);
    CFStringRef cfRandomString = CFUUIDCreateString(kCFAllocatorDefault, uuid);
    CFRelease(uuid);
    
#if __has_feature(objc_arc)
    NSString* randomString = (NSString*) CFBridgingRelease(cfRandomString);
#else
    NSString* randomString = [((__bridge NSString*) cfRandomString) autorelease];
#endif
    
    return randomString;
}

+(NSString*)randomFileNameWithExtension:(NSString*)extension
{
    return [[NSString randomString] stringByAppendingPathExtension:extension];
}

+(NSString*)randomFileNameInDirectory:(NSSearchPathDirectory)directory withExtension:(NSString*)extension
{
    NSString* path = [[[[NSFileManager defaultManager] URLsForDirectory:directory inDomains:NSUserDomainMask] lastObject] absoluteString];
    return [path stringByAppendingPathComponent:[NSString randomFileNameWithExtension:extension]];
}

@end