异常信息：
Undefined symbols for architecture i386:"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)ld: symbol(s) not found for architecture i386clang: error: linker command failed with exit code 1 (use -v to see invocation)
解决办法：在Build Phases选项卡的Link Binary With Libraries中，增加以下依赖：
注意：如果是Xcode 7.0之后的版本,需要添加libc++.tdb,libz.tdb;
如果是Xcode 7.0之前的版本,需要添加libc++.dylib,libz.dylib;