这是一个能为你做的功能。这来自Apple的Adventure示例代码：

Here's a function that will do it for you. This is from an Apple's Adventure example code:

CGFloat SDistanceBetweenPoints(CGPoint first, CGPoint second) {
    return hypotf(second.x - first.x, second.y - first.y);
}

要从您的代码中调用此函数：

To call this function from your code:

CGFloat distance = SDistanceBetweenPoints(nodeA.position, nodeB.position);