问题:
在Xcode9.3之后,使用Block会出现警告
Block implicitly retains 'self'; explicitly mention 'self' to indicate this is intended behavior
如下图所示

Xcode9.3中Block警告
1.png
解决办法:
在Build Setting中搜索“implicit retain”将值改为NO
Xcode9.3中Block警告2.png
在Xcode9.3之后,使用Block会出现警告
Block implicitly retains 'self'; explicitly mention 'self' to indicate this is intended behavior
如下图所示