ios – 带KeyChain的TouchID – 输入密码屏幕出现格式错误(Swift)

我很难用这个:

我们的应用程序使用TouchID从KeyChain中检索用于在WKWebView中对WebApp进行身份验证的机密.当用户使用TouchID成功进行身份验证时,一切正常.

当用户使TouchID失败然后点击“输入密码”以通过设备密码进行身份验证时,就会出现问题.我注意到呈现的屏幕是纯白色,并且密码文本框不会显示输入的最后一个字符的值,直到它被屏蔽,从而产生奇怪的用户体验.这对我来说似乎是个错误,除非我在某种程度上错过了配置要求.

    // global arguments for the touchId keychain queries
    let kSecClassValue = NSString(format: kSecClass)
    let kSecAttrAccountValue = NSString(format: kSecAttrAccount)
    let kSecValueDataValue = NSString(format: kSecValueData)
    let kSecClassGenericPasswordValue = NSString(format: kSecClassGenericPassword)
    let kSecAttrServiceValue = NSString(format: kSecAttrService)
    let kSecMatchLimitValue = NSString(format: kSecMatchLimit)
    let kSecReturnDataValue = NSString(format: kSecReturnData)
    let kSecMatchLimitOneValue = NSString(format: kSecMatchLimitOne)
    let kSecAttrAccessControlValue = NSString(format: kSecAttrAccessControl)
    let kSecUseOperationPromptValue = NSString(format: kSecUseOperationPrompt)

    // set access control
    let accessControl = SecAccessControlCreateWithFlags(kCFAllocatorDefault,
        kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly, .UserPresence, nil)
    // Instantiate a new default keychain query
    // Tell the query to return a result
    // Limit our results to one item
    var keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPasswordValue, service, userAccount, kCFBooleanTrue, kSecMatchLimitOneValue, "Place your finger to authenticate.", accessControl.takeUnretainedValue()], forKeys: [kSecClassValue, kSecAttrServiceValue, kSecAttrAccountValue, kSecReturnDataValue, kSecMatchLimitValue, kSecUseOperationPromptValue, kSecAttrAccessControlValue])

    var dataTypeRef :Unmanaged<AnyObject>?

    // Search for the keychain item
    touchIdStatusCode = SecItemCopyMatching(keychainQuery, &dataTypeRef)

这是生成的keychainQuery字典:

{
    "accc" = "<SecAccessControlRef: 0x170621140>";
    "acct" = “MY_ACCOUNT”;
    "class" = genp;
    "m_Limit" = "m_LimitOne";
    "r_Data" = 1;
    "svce" = “MY_SERVICE”;
    "u_OpPrompt" = "Place your finger to authenticate.";
}

此行为存在于最新的iOS版本(8.4)上.这是我所指的屏幕:
《ios – 带KeyChain的TouchID – 输入密码屏幕出现格式错误(Swift)》

我的问题是:我是否以某种方式导致屏幕被我调用TouchID的方式打破?或者这种情况完全正常吗?

谢谢,对于冗长的帖子感到抱歉!

最佳答案 描述的问题是Apple工程师确认的错误.从iOS 9.0.2开始,它仍然存在.

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