objc-class-ref in AppDelegate.o报错解决方案

xcode6.0升级到xcode6.1后,程序编译报错,错误如下:这是个很常 见的错误,很多项目在更换xcode版本后,都会出现类似的问题。

Undefined symbols for architecture x86_64: "_OBJC_CLASS_$_QQApiInterface", referenced from:

objc-class-ref in AppDelegate.o "_OBJC_CLASS_$_ShareSDK", referenced from:

objc-class-ref in AppDelegate.o
objc-class-ref in RecipeDetailViewController.o objc-class-ref in showViewController.o objc-class-ref in video_show.o

"_OBJC_CLASS_$_TencentOAuth", referenced from: objc-class-ref in AppDelegate.o

"_OBJC_CLASS_$_WXApi", referenced from: objc-class-ref in AppDelegate.o

"_OBJC_CLASS_$_WeiboApi", referenced from: objc-class-ref in AppDelegate.o

"_OBJC_CLASS_$_YXApi", referenced from: objc-class-ref in AppDelegate.o

ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
解决方案:
Xcode升级到6.1.1 默认让所有App都通过64位编译器编译。原来 在Xcode6.0的时候默认的Architectures只有(arm7,armv7s), 到6.1.1默认就带上arm64的参数了。

1.把1.选中Targets—>Build Settings—>Architectures。 把build active architectures only 改为 NO。
2. 把最下面的Valid Architectures中的arm64参数删掉就可以了

或者:

双击Architectures,选择other,删除$(ARCH_STANDARD),然 后增加armv7和armv7s(写上: $(ARCHS_STANDARD_32_BIT))。
3.clean 再build。

结果设置如下图: