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

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CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF 設(shè)置為 No 就可以了。
XCode9.3創(chuàng)建的工程默認(rèn)是打開的,總不至于寫個(gè)約束前面加無(wú)數(shù)個(gè)self->吧