Xcode9.3 解决Block implicitly retains 'self'; explicitly mention 'self' to indicate this...警告

升级到Xcode9.3之后,大括号里声明的属性,在Block里面就会出现Block implicitly retains 'self'; explicitly mention 'self' to indicate this...的警告,大量这样声明的属性,产生了大量的黄色警告⚠️,很烦人!解决办法如下图所示: 在Build Setting里面搜索Implicit retain of 'self'
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