是否有必要在UIView.animateWithDuration(...)的闭包中使用[unown self]? [英] Is it necessary to use [unowned self] in closures of UIView.animateWithDuration(...)?

问题描述

    UIView.animateWithDuration(1,
        animations: { [unowned self] in
            self.box.center = self.boxTopRightPosition
        },
        completion: { [unowned self] completed in
            self.box.hidden = true
    })

是否有必要避免内存泄漏?

Is it necessary to avoid memory leak?

推荐答案

否，在这种情况下不需要. animations和completion未被self保留，因此没有强大的保留周期的风险.

No, it is not needed in this case. animations and completion are not retained by self so there is no risk of strong retain cycle.

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