在真机上编译无误，在模拟器上编译报错：
duplicate symbol _gestureMinimumTranslation in:
/Users/Sam/Library/Developer/Xcode/DerivedData/Virtual_Human_Avatar-fwgdkxpnkzapxrdzkggtmbnfhjwb/Build/Intermediates/Virtual Human Avatar.build/Debug-iphonesimulator/Virtual Human Avatar.build/Objects-normal/i386/VARendererViewController.o
/Users/Sam/Library/Developer/Xcode/DerivedData/Virtual_Human_Avatar-fwgdkxpnkzapxrdzkggtmbnfhjwb/Build/Intermediates/Virtual Human Avatar.build/Debug-iphonesimulator/Virtual Human Avatar.build/Objects-normal/i386/VAMenuScreenViewController.o
ld: 1 duplicate symbol for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation)
这是我在.h文件中声明的const常量，报错就是因为这个:
CGFloat const gestureMinimumTranslation = 20.0;
解决： 搜索gestureMinimumTranslation关键字，把这个const常量移到.m文件中即可
