最近在專案中遇到了這個問題，錯誤定位的位置是typeof(self) __weak weakSelf = self; 出現問題的原因是因為解析器把“typeof”識別為gnu *模式中的關鍵字，而我們專案是用Cordova建立的專案，預設指定的是C99模式。
修改build settings下面的C Language Dialect指定模式即可，如下圖：
Xcode10:Implicit declaration of function '' is invalid in C99
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