我一直试图找到问题几个小时没有结果.我已经更新到Xcode 6并且从那时起在ioS8.0和7.1上都出现了这个错误:
Undefined symbols for architecture armv7:
"___gnu_f2h_ieee", referenced from:
_playbackCallback in Audio.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
谢谢你的帮助.
编辑(完整构建日志错误):
Ld /Users/rjc/Library/Developer/Xcode/DerivedData/Acc-hjhfomxkmwbyxwbfzjbduabbhlcc/Build/Products/Debug-iphoneos/Acc.app/Acc normal armv7
cd /Users/rjc/Desktop/apps/Acc
export IPHONEOS_DEPLOYMENT_TARGET=7.1
export PATH="/Applications/Xcode6-Beta2.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Applications/Xcode6-Beta2.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode6-Beta2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch armv7 -isysroot /Applications/Xcode6-Beta2.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.0.sdk -L/Users/rjc/Library/Developer/Xcode/DerivedData/Acc-hjhfomxkmwbyxwbfzjbduabbhlcc/Build/Products/Debug-iphoneos -L/Users/rjc/Desktop/apps/Acc/Acc -F/Users/rjc/Library/Developer/Xcode/DerivedData/Acc-hjhfomxkmwbyxwbfzjbduabbhlcc/Build/Products/Debug-iphoneos -F/Users/rjc/Desktop/apps/Acc -filelist /Users/rjc/Library/Developer/Xcode/DerivedData/Acc-hjhfomxkmwbyxwbfzjbduabbhlcc/Build/Intermediates/Acc.build/Debug-iphoneos/Acc.build/Objects-normal/armv7/Acc.LinkFileList -dead_strip -ObjC -all_load -fobjc-arc -fobjc-link-runtime -miphoneos-version-min=7.1 -lCorePlot-CocoaTouch -framework CoreTelephony -framework MediaPlayer -framework MessageUI -framework Social -framework Accelerate -framework CoreLocation -framework MobileCoreServices -framework AVFoundation …我有一个Listview和一个Textbox绑定到所选项目.当用户删除文本框中的值(这是一个双精度值)时,我收到以下错误: Value '' cannot be converted.所以我有TargetNullValue='',像这样:
<TextBox x:Name="textBoxVoltage" Text="{Binding Voltage, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, TargetNullValue=''}" />
但我仍然得到错误......我做错了什么？谢谢.