swift 中使用weak self

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request.responseString(encoding: NSUTF8StringEncoding) {[weak self] (res) -> Void inif let strongSelf = self {//do something...}}



weak var weakSelf = selfrequest.responseString(encoding: NSUTF8StringEncoding) {(res) -> Void inif let strongSelf = weakSelf {//do something}}



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