XCode 9.3 warning

Block implicitly retains 'self'; explicitly mention 'self' to indicate this is intended behavior Insert 'self->'

Masonry.png CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF.png

CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF 设置为 No 就可以了。

XCode9.3创建的工程默认是打开的，总不至于写个约束前面加无数个self->吧