duplicate symbol _registerTag in:
/Users/bear/Library/Developer/Xcode/DerivedData/CarShare-aocjqpzrgbdimnfzsvvibtngyved/Build/Intermediates.noindex/XXXX.build/Debug-iphoneos/XXXX.build/Objects-normal/armv7/XXXXX.o
/Users/bear/Library/Developer/Xcode/DerivedData/CarShare-aocjqpzrgbdimnfzsvvibtngyved/Build/Intermediates.noindex/XXXX.build/Debug-iphoneos/XXXX.build/Objects-normal/armv7/XXXXX.o
ld: 1 duplicate symbol for architecture armv7
錯解決方法：搜索後發現 兩個.m 文件中 有 兩個重複const 的變量 修改下就可以了