[LAContext biometryType]:iOS 11.0.0上无法识别的选择器

Question

我看到织物上发生了数十次撞击事故

Fatal Exception: NSInvalidArgumentException
-[LAContext biometryType]: unrecognized selector sent to instance 0x1c066aa00

这很奇怪,因为我只在iOS 11+上调用LAContext上的biometryType.

代码:

    private static var biometryType: BiometryType? {
        let context = LAContext()

        guard context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: nil),
            context.evaluatedPolicyDomainState == BiometryManager.savedPolicyDomainState else { return nil }

        if #available(iOS 11.0, *) {
            switch context.biometryType {
            case .typeFaceID: return .typeFaceID
            case .typeTouchID: return .typeTouchID
            case .none: return nil
            }
        }
        return .typeTouchID
    }

有什么建议？

我唯一的线索是所有崩溃都与11.0.0有关.因此,Apple可能在11.0.0中添加了biometryType,但稍后.

链接:

https://developer.apple.com/documentation/localauthentication/lacontext/2867583-biometrytype

http://www.codeprocedures.com/question/nsinvalidargumentexception-unrecognized-selector-sent-to-instance-on-specific-phone-with-ios-11/

Answer 1

正如@ stonesam92所说,这可能是ios 11.0.0中的一个错误.以下代码保护我免受崩溃.

if #available(iOS 11.0, *), authenticationContext.responds(to: #selector(getter: LAContext.biometryType))

Answer 2

这也有效:

if #available(iOS 11.0.1, *) {...}

iPhone X首次发布于11.0.1

从崩溃报告来看,这绝对有效.