ios – 如何在swift中创建UnsafeMutablePointer对象

概述我需要调用UIScrollViewDelegate方法,我不知道如何创建UnsafeMutablePointer对象. let pointer:UnsafeMutablePointer<CGPoint> = CGPoint(x: 0, y: 1) as! UnsafeMutablePointer<CGPoint>self.scrollViewWillEndDragging(self.coll 我需要调用uiscrollviewdelegate方法,我不知道如何创建UnsafeMutablePointer对象.

let pointer:UnsafeMutablePointer<CGPoint>  = CGPoint(x: 0,y: 1) as! UnsafeMutablePointer<CGPoint>self.scrollVIEwWillEndDragging(self.collectionVIEw,withVeLocity: CGPoint(x: 0,y: 1),targetContentOffset: pointer)func scrollVIEwWillEndDragging(scrollVIEw: UIScrollVIEw,withVeLocity veLocity: CGPoint,targetContentOffset: UnsafeMutablePointer<CGPoint>) {       //Some code here}

解决方法

import Foundationvar point = CGPoint(x: 10.0,y: 20.0)let p = withUnsafeMutablePointer(&point) { (p) -> UnsafeMutablePointer<CGPoint> in    return p}print(p.memory.x,p.memory.y) // 10.0 20.0point.x = 100.0print(p.memory.x,p.memory.y) // 100.0 20.0

借助斯威夫特的句法糖

import Foundationvar point = CGPoint(x: 10.0,y: 20.0)let p = withUnsafeMutablePointer(&point) {  }print(p.dynamicType) // UnsafeMutablePointer<CGPoint>

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