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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