IOS development-replacing udid with keychain

Apple has banned UUID applications since January 1. So we need to replace it with some methods. Below I will replace the uuid with the keychain access.

For the keychain application, Apple provides an example program named generickeychain. Here: Example.

1. Import the Security. Framework file to the database and import the keychainitemwrapper. h and keychainitemwrapper. M files to the project, and reference the header file: # import "keychainitemwrapper. H"

2. code example:

    NSString *str =nil;    KeychainItemWrapper *keychainItem = [[KeychainItemWrapper alloc] initWithIdentifier:@"UUID" accessGroup:@"com.xxx.xxx"];        NSString *uuidStr = [keychainItem objectForKey:(id)kSecValueData];    if (uuidStr.length == 0) {        NSString *myUUIDStr = [[[UIDevice currentDevice] identifierForVendor] UUIDString];        [keychainItem setObject:myUUIDStr forKey:(id)kSecValueData];        str = myUUIDStr;    }    else{        str = [keychainItem objectForKey:(id)kSecValueData];    }    NSLog(@"======%@",str);    return str;

The imported security. Framework is because the keychainitemwrapper file only encapsulates security and is more conducive to our calls.