I'm pretty new to developing, and i got this error, I'm not shire if i got something missing in my AppDelegate files so I'm gonna show you the files.I'm pretty new to developing, and i got this er
阅读背景：
错误“_objc_class_$ _AppDelegate”，引用自:“和错误:链接器命令失败，退出代码1(使用-v查看调用)”
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