对于错误信息Undefined symbols for architecture i386:的解决方案

其他代码

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当拷贝文件到工程里的时候，若不注意勾选"Add to Target"，运行时会报如下类似的错误:

Undefined symbols for architecture i386:

 

"_OBJC_CLASS_$_SKPSMTPMessage", referenced from:

  objc-class-ref in ConfirmController.o

 

"_kSKPSMTPPartContentTransferEncodingKey", referenced from:

  -[ConfirmController sendEmail] in ConfirmController.o

 

"_kSKPSMTPPartMessageKey", referenced from:

  -[ConfirmController sendEmail] in ConfirmController.o

 

"_kSKPSMTPPartContentTypeKey", referenced from:

  -[ConfirmController sendEmail] in ConfirmController.o

 

ld: symbol(s) not found for architecture i386