ios - 架构 i386 : _OBJC_CLASS_$_SKPSMTPMessage", 的 undefined symbol 引用自:错误

Question

我已经导入了用于在后台从应用程序发送电子邮件的框架，即 SKPSMTPMessage 框架。有人可以建议为什么显示以下错误

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
collect2: ld returned 1 exit status

取自框架的来源:-

Locking the Fields in MFMailComposeViewController

更新:

Answer:只需将文件夹拖放到项目上，然后单击复制即可。 也就是选择项目复选框和目标复选框。

Answer 1

如果您的类的 .m 文件未在目标的“构建阶段”选项卡的“编译源”步骤下列出，则可能会出现此类错误。通常 Xcode 会为您执行此操作，但有时它会丢失绘图并且您需要手动添加 .m 文件。

为此:

TargetSettings -> Build Phases -> Compile Sources -> 添加你的 .m 类 ->Build and Run