如何通过数组和LT元素循环; UnsafeMutablePointer＆GT;在斯威夫特 [英] how to loop through elements of array of <UnsafeMutablePointer> in Swift

问题描述

我是新来的斯威夫特，通过MKMapPoints这是我从一个MKPolygon获得通过调用myPoly.points（）数组想循环。
然而，我被困在如何遍历指针的C数组的每个元素。

I am new to Swift and wanted to loop through an array of MKMapPoints which I get from an MKPolygon by calling myPoly.points(). However, I am stuck as to how to loop through every element of the C-Array of pointers.

 for element in myPointsArray {} 

不工作，我不知道如何确定这种斯威夫特数组的元素的数量。有任何想法吗？感谢您的帮助！

does not work and I don't know how determine the number of elements of this kind of array in Swift. Any ideas? Thanks for your help!

推荐答案

UnsafeBufferPointer presents不安全的指针和计数作为一个集合，所以你可以为..在过吧，下标是安全的，它传递给上工作的集合算法等：

UnsafeBufferPointer presents an unsafe pointer and a count as a collection so you can for..in over it, subscript it safely, pass it to algorithms that work on collections etc:

for point in UnsafeBufferPointer(start: poly.points(), count: poly.pointCount) {
    println("\(point.x),\(point.y)")
}

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