我正在使用钥匙串在本地设备上存储数据，但已决定通过iCloud适应多个设备的使用。 我已启用了iCloud权限，并在会员中心创建了必要的配置。 然而，在数据被存储时，似乎没有存储在云端。 我正在模拟器和我的iPhone设备之间进行测试。 模拟器使用我的账户登录。 每个设备都继续保存数据，但另一个设备看不到结果。
我只是将kSecAttrSynchronizable和kCFBooleanTrue添加到现有设置中，我认为这是使密钥链使用云所需的全部内容。
下面是用于存储和调取密钥链数据的代码：
+ (NSMutableDictionary *)getKeychainQuery:(NSString *)service
{
return [NSMutableDictionary dictionaryWithObjectsAndKeys:
(__bridge id)kSecClassGenericPassword,(__bridge id)kSecClass,
service, (__bridge id)kSecAttrService,
service, (__bridge id)kSecAttrAccount,
(__bridge id)kCFBooleanTrue, (__bridge id)kSecAttrSynchronizable,
(__bridge id)kSecAttrAccessibleAfterFirstUnlock,(__bridge id)kSecAttrAccessible,
nil];
}
+ (void)save:(NSString *)service data:(id)data
{
NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
CFTypeRef result = NULL;
SecItemDelete((__bridge CFDictionaryRef)keychainQuery);
[keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(__bridge id)kSecValueData];
OSStatus status = SecItemAdd((__bridge CFDictionaryRef)keychainQuery, &result);
if (status == errSecSuccess) NSLog(@"Succcessfully Stored Value");
else NSLog(@"Failed to store value with code: %ld",(long)status);
}
+ (id)load:(NSString *)service {
id ret = nil;
NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
[keychainQuery setObject:(id)kCFBooleanTrue forKey:(__bridge id)kSecReturnData];
[keychainQuery setObject:(__bridge id)kSecMatchLimitOne forKey:(__bridge id)kSecMatchLimit];
CFDataRef keyData = NULL;
if (SecItemCopyMatching((__bridge CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {
@try {
ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge NSData *)keyData];
}
@catch (NSException *e) {
NSLog(@"Unarchive of %@ failed: %@", service, e);
}
@finally {}
}
if (keyData) CFRelease(keyData);
return ret;
}
+ (void)delete:(NSString *)service {
NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
SecItemDelete((__bridge CFDictionaryRef)keychainQuery);
}