[英]How to create UnsafeMutablePointer<CGPoint> Object in swift
I need to call the UIScrollViewDelegate
methods I don't know how to create UnsafeMutablePointer object. 我需要调用不知道如何创建UnsafeMutablePointer对象的
UIScrollViewDelegate
方法。
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
}
import Foundation
var 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 20.0
point.x = 100.0
print(p.memory.x, p.memory.y) // 100.0 20.0
with help of Swift's syntactic sugar 借助Swift的语法糖
import Foundation
var point = CGPoint(x: 10.0, y: 20.0)
let p = withUnsafeMutablePointer(&point) { $0 }
print(p.dynamicType) // UnsafeMutablePointer<CGPoint>
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.