当用CocoaPods时出现了下面的错误时：
[!] The dependency `UMengSocialCOM (~> 5.2.1)` is not used in any concrete target. [!] The dependency `
阅读背景：
iOS CocoaPods 报错： The dependency `UMengSocialCOM (~> 5.2.1)` is not used in any concrete target.
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