如何从点数组创建CGPathRef [英] How to create CGPathRef from Array of points

问题描述

大家好我一直在地图应用程序中工作，我需要在两个位置之间绘制路线，我也有路线坐标（使用google Direction api）并将其保存在一个数组中，现在我只需要要做的是从点数组创建一个路径，稍后我将使用MKOverlayPathView的路径在地图上创建真实路线。这里我的问题是如何从坐标数组创建一个CGPathRef，或者任何其他方式来执行相同的操作

在此先感谢

Hi all i've been working in a map application, Where i needed to draw the route between two locations, I've got route coordinates too (using google Direction api) and kept it in an array, Now all i need to do is creating a path from the array of points, later i will use the path with MKOverlayPathView for creating real routes on the map. Here my problem is how to create a CGPathRef from the array of coordinates, Or any other way to do the same operation
Thanks in Advance

推荐答案

假设坐标作为NSValue对象存储在NSArray中，您可以执行以下操作：

Assuming the coordinates are stored in an NSArray as NSValue objects, you can do the following:

CGMutablePathRef path = CGPathCreateMutable();
if (points && points.count > 0) {
    CGPoint p = [(NSValue *)[points objectAtIndex:0] CGPointValue];
    CGPathMoveToPoint(path, nil, p.x, p.y);
    for (int i = 1; i < points.count; i++) {
        p = [(NSValue *)[points objectAtIndex:i] CGPointValue];
        CGPathAddLineToPoint(path, nil, p.x, p.y);
    }
}
// do stuff
CGPathRelease(path);

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