目标 c 比较范围相交 [英] objective c compare range intersect

问题描述

我正在尝试找到 2 个数字范围的交集，例如……

I am trying to find the intersection of 2 number ranges, say for example...

范围 A 是从 10 到 100，范围 B 是从 60 到 70

range A is from 10 to 100, range B is from 60 to 70

是否有一种简单的方法无需编写大量 if 语句来计算两个范围的交集，因此在此示例中为 10.

Is there an easy way without writing a load of if statements to calculate the intersection of the two ranges, so in this example it would be 10.

谢谢，

推荐答案

如果您拥有或制作 NSRange 对象，NSIntersectionRange 函数将为您完成此操作.当没有交集时，请务必检查它返回的内容.

If you have or make NSRange objects, the NSIntersectionRange function will do this for you. Just be sure to check what it returns when there is no intersection.

NSRange a = NSMakeRange(10, 90);
NSRange b = NSMakeRange(60, 10);
NSRange intersection = NSIntersectionRange(a, b);
if (intersection.length <= 0)
    NSLog(@"Ranges do not intersect");
else
    NSLog(@"Intersection = %@", NSStringFromRange(intersection));

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