IOS开发时遇到Undefined symbols for architecture解决两例（微信及高德地图）

微信开发WeChatSDK报Undefined symbols for architecture x86_64错误

今天在写iOS项目时，需要用到微信登陆模块，所以引入了微信官方的iOS SDK，但是编译时一直出Mach-O的错误，怀疑是SDK本身的问题。于是建了个新的空项目，导入WeChatSDK，依旧报错，报错内容一致：

Undefined symbols for architecture x86_64:
"operator delete[](void*)", referenced from:
+[WeChatApiUtil EncodeBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
+[WeChatApiUtil NsDataEncodeBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
+[WeChatApiUtil DecodeWithBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
+[WeChatApiUtil DecodeBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
"operator new[](unsigned long)", referenced from:
+[WeChatApiUtil EncodeBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
+[WeChatApiUtil NsDataEncodeBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
+[WeChatApiUtil DecodeWithBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
+[WeChatApiUtil DecodeBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
"___gxx_personality_v0", referenced from:
Dwarf Exception Unwind Info (__eh_frame) in AppDelegate.o
Dwarf Exception Unwind Info (__eh_frame) in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

经研究，加入libc++.dylib可解决问题。

具体方法是：打开工程的属性窗口，在Build Phases的Link Binary With Libraries里面添加libc++.dylib

iOS开发错误：Undefined symbols for architecture i386 解决方案


在做高德地图SDK时，碰到了一个错误：

ld: warning: ignoring file /iOS-Dev/MyDiary/Release-iphoneos/libMAMapKit.a, missing required architecture i386 in file /iOS-Dev/MyDiary/Release-iphoneos/libMAMapKit.a (2 slices)

Undefined symbols for architecture i386:

“_OBJC_CLASS_$_MAMapView”, referenced from:

objc-class-ref in LocationViewController.o

ld: symbol(s) not found for architecture i386

clang: error: linker command failed with exit code 1 (use -v to see invocation)

网络上所说的添加library,添加头文件 ，添加.m文件 ，添加framework都添加了。问题依旧。回想我在真机上测试是没有问题的。就是在模拟器上测试时出现这个问题。那是不是和平台有关呢?记得当时copy到项目文件夹中的两个文件如下：

很容易理解，一个是真机上的测试，一个是模拟器上的测试。是这个原因造成的吗?

查看”library search path”：

我们看到，模拟器在最后一个，如果我们调换一下顺序会怎么样?测试一下：

然后我们编译。哇，竟然成功了。