ブロックの外でまず
__unsafe_unretained typeof(self) weakSelf = self;
と宣言して、 ブロック内ではweakSelfを用いる
###Reference
http://stackoverflow.com/questions/14556605/capturing-self-strongly-in-this-block-is-likely-to-lead-to-a-retain-cycle
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ブロック内でselfを使うと「Capturing self strongly in this block is likely to lead to a retain cycle」と出る場合には
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