问编译cocos2d-x v3 IOS项目时在集成AdMob (IOS)框架时出错

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当我用Xcode编译cocos2d-x V3项目时，它运行得很好，但是在包含AdMob框架时，它会显示以下链接器错误。

我已经在“构建设置”下的“其他链接器”部分中包含了"-ObjC“。

未定义的架构符号armv7："_kCMTimeZero"，引用于：-GADVideoPlayer setAudioMixVolume: in GoogleMobileAds(GADVideoPlayer.o) "_CMTimeMakeWithSeconds"，引用于：-GADVideoPlayer seekToTime: in GoogleMobileAds(GADVideoPlayer.o) "_CMTimeGetSeconds"，引用于：-GADVideoPlayer notifyVideoPlayerWithTime: in GoogleMobileAds(GADVideoPlayer.o) -GADVideoPlayer notifyVideoReadyToPlay in GoogleMobileAds(GADVideoPlayer.o) "_CMTimeMake"，引用来源：-GADVideoPlayer observePlayer in GoogleMobileAds(GADVideoPlayer.o) "_OBJC_CLASS_$_EKEventEditViewController"，引用于: objc-class-ref in GoogleMobileAds(GADOpener.o) "_OBJC_CLASS_$_MFMailComposeViewController"，引用于: objc-class-ref in GoogleMobileAds(GADOpener.o) "_SCNetworkReachabilityCreateWithAddress"，引用自: l001 in GoogleMobileAds(GADGestureUtil.o)引用来源: objc-class-ref in GoogleMobileAds(GADDevice.o) objc-class-ref in GoogleMobileAds(GADOpener.o) "_SCNetworkReachabilitySetCallback"，引用于：__35-GADNetwork enableNetworkChecking_block_invoke in GoogleMobileAds(GADNetwork.o) "_SCNetworkReachabilityGetFlags"，引用自: l001 in GoogleMobileAds(GADGestureUtil.o) "_OBJC_CLASS_$_EKEventStore"，引用来源: objc-class-ref in GoogleMobileAds(GADSlot+MRAID.o) objc-class-ref in GoogleMobileAds(GADOpener.o) "_SCNetworkReachabilitySetDispatchQueue"，引用于：__35-GADNetwork enableNetworkChecking_block_invoke in GoogleMobileAds(GADNetwork.o) __36-GADNetwork disableNetworkChecking_block_invoke in GoogleMobileAds(GADNetwork.o) "_OBJC_CLASS_$_EKEvent"，引用来源: objc-class-ref in GoogleMobileAds(GADOpener.o) "_OBJC_CLASS_$_ASIdentifierManager"，引用于: objc-class-ref in GoogleMobileAds(GADDevice.o) objc-class-ref in GoogleMobileAds(GADGestureIdUtil.o) objc-class-ref in GoogleMobileAds(GADMAdURLAdapter.o) "_SCNetworkReachabilityCreateWithName"，引用于：__35-GADNetwork enableNetworkChecking_block_invoke in GoogleMobileAds(GADNetwork.o) "_OBJC_CLASS_$_CTTelephonyNetworkInfo"，引用于: objc-class-ref in GoogleMobileAds(GADDevice.o)引用的GoogleMobileAds：__48-GADDevice enableNetworkChecking_block_invoke in GoogleMobileAds(GADDevice.o)：GoogleMobileAds中找不到符号armv7 clang: GoogleMobileAds中的链接器命令失败，退出代码1(使用-v查看调用)