ios - Keychain Wrapper 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[_NSZeroData _fastCharacterContents]

Question

我正在使用此处找到的钥匙串包装器：

https://gist.github.com/1170641

像这样：

。H ：

    #import "KeychainItemWrapper.h"

    KeychainItemWrapper *keychainItem;

米：

 keychainItem = [[KeychainItemWrapper alloc] initWithIdentifier:@"login" accessGroup:nil];

NSString *password = [keychainItem objectForKey:(__bridge id)kSecValueData];
NSString *username = [keychainItem objectForKey:(__bridge id)kSecAttrAccount];

然后它崩溃了：

由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[_NSZeroData _fastCharacterContents]：无法识别的选择器发送到实例 0x14dcba60”

编辑：

由于回答了问题的用户，崩溃不再存在，但是当我检索用户名或密码时，它们有时会被交换，我的意思是 80% 的时间。

Answer 1

Edit: I'm using kSecValueData but commented out //#define PASSWORD_USES_DATA in KeychainItemWrapper.m. Also I started using resetKeychainItem instead of trying to override the values myself.

Old Answer: I had this issue until I changed kSecValueData to kSecAttrService, which can be used for passwords also according to SecItem.h. Now everything seems to work fine (setting and retrieving).

Answer 2

我有一个类似的问题，我通过改变这个来解决它：

NSString *password = [keychainItem objectForKey:(__bridge id)kSecValueData];
NSString *username = [keychainItem objectForKey:(__bridge id)kSecAttrAccount];

对此：

NSString *password = [[NSString alloc] initWithData:[keychainItem objectForKey:(id)kSecValueData] encoding:NSUTF8StringEncoding];
NSString *username = [keychainItem objectForKey:(id)kSecAttrAccount];