更新到Xcode8，在iOS8模拟器中运行我的应用程序并崩溃，尽管iOS9和iOS10没问题。"dyld:lazysymbolbindingfailed:Symbolnotfound:_objc_unsafeClaimAutoreleasedReturnValueReferencedfrom:**Expectedin:/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS8.1.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libobjc.A.dylibdyld:Symbolno