在iOS 7.1上导入LocalAuthentification.framework崩溃 [英] Import LocalAuthentification.framework crashes on iOS 7.1

问题描述

使用LocalAuthentication时出现问题并支持iOS 7.0

当我尝试

<$ p时$ p> import LocalAuthentication


如果目标iOS版本是小于8.0。

我尝试在构建阶段将 LocalAuthentication.framework 标记为可选，并检查课程可用性通过调用：

  var isTouchIDSupported：Bool {
 if let contextClass：AnyClass = NSClassFromString（LAContext ）{
返回LAContext（）。canEvaluatePolicy（.DeviceOwnerAuthenticationWithBiometrics，error：nil）
} 
返回false 
} 
  

如果我评论LAContext（）字符串，它不会崩溃：

  var isTouchIDSupported：Bool {
如果让contextClass：AnyClass = NSClassFromString（LAContext）{
 //返回LAContext（）。canEvaluatePolicy（.DeviceOwnerAuthenticationWithBiometrics，error：nil）
} 
返回false 
  

}

如果我访问该应用程序，它会在应用程序启动的第一秒崩溃任何LA类（例如LAContext）在我的代码的任何地方。我在这里做错了什么？

这次崩溃的控制台日志：

  dyld：未找到符号：_objc_isAuto 
引用自：/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 
预期于：/Applications/Xcode.app/Contents/Developer /Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk/usr/lib/libobjc.A.dylib 
 in /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 
  

解决方案

LocalAuthentication.framework可从iOS 8.0获得。 [ iOS Frameworks ]

为了避免iOS 7中的崩溃，请转到项目目标 - >构建阶段 - >链接二进制文件库 - >将LocalAuthentication.framework的状态设置为可选 '

Have a problem with usage of LocalAuthentication and support iOS 7.0

when I'm trying to

import LocalAuthentication

I'm getting crash if target iOS version is less than 8.0.

I tried to mark LocalAuthentication.framework as optional in the build phases and check class availability by calling:

var isTouchIDSupported: Bool {
        if let contextClass: AnyClass = NSClassFromString("LAContext") {
            return LAContext().canEvaluatePolicy(.DeviceOwnerAuthenticationWithBiometrics, error: nil)
        }
        return false
    }

it do not crash if I comment LAContext() string like:

var isTouchIDSupported: Bool {
            if let contextClass: AnyClass = NSClassFromString("LAContext") {
                //return LAContext().canEvaluatePolicy(.DeviceOwnerAuthenticationWithBiometrics, error: nil)
            }
            return false

}

it crashes at the first seconds the app is launches if I accessing the any of LA class (LAContext for instance) in any place of my code. What I'm doing wrong here?

Console log for this crash:

dyld: Symbol not found: _objc_isAuto
  Referenced from: /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
  Expected in: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk/usr/lib/libobjc.A.dylib
 in /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation

解决方案

LocalAuthentication.framework is available from iOS 8.0. [ iOS Frameworks ]

To avoid the crash in iOS 7, go to 'Project Targets' -> 'Build Phases' -> 'Link Binary with Libraries' -> set LocalAuthentication.framework's status to 'Optional'

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