Save iPhone, iPad, iPod UUID using NSUserDefaults

A convenient helper method for saving the UDID serial number of the target device (either iPhone, iPad or iPod) to User Preferences (via
NSUserDefaults).


/** Save the Device ID to User Preferences.

 Please note that it does not save actual ID, but something similar.

 @return Returns true if the value has be written, false otherwise. Please note that false value does not mean that there was an error.

 */
+ (BOOL)saveDeviceIdToUserPreferences {
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    if (!userDefaults) { return NO; }
    NSString *deviceId = [userDefaults objectForKey:kUserPreferences_KeyForDeviceID];
    if (!deviceId || [deviceId isEqualToString:@""]) {
        [userDefaults setObject:[[NSUUID UUID] UUIDString] forKey:kUserPreferences_KeyForDeviceID];
        return YES;
    }
    return NO;
}


Download the ready-for-use source file (.m) of Save iPhone, iPad, iPod UUID using NSUserDefaults