How do I store an NSRange in a NSMutableArray or other container?

Question

Here's what I want to do:

NSRange r = NSMakeRange(0,5);
id a = [NSMutableArray a];
[a addObject: r]; // but NSRange is not a NSObject *

With a boolean, I'd use code like this:

[a addObject: [NSNumber numberWithBool: YES]];

or with an integer:

[a addObject: [NSNumber numberWithInteger: 3]];

So what's the equivalent with a NSRange ? What I don't really want to do is create my own subclass of NSObject to accomplish this. Surely there's a way with what Apple's already provided?

Answer 1

Use NSValue's +valueWithRange: . To retrieve the range structure back, use the property rangeValue .

[a addObject:[NSValue valueWithRange:r]];
...

NSRange r = a[4].rangeValue;

Answer 2

[NSValue valueWithRange:r];

并通过以下方式恢复原状：

NSRange r = [rangeObject rangeValue];

Answer 3

If you need to store the NSRange in a property list, you can also turn an NSRange into an NSString using the NSStringFromRange function. And then, you can turn that string back into a range using the NSRangeFromString function.

Answer 4

另一个选项可能是将这些范围添加到NSIndexSet ，具体取决于您打算下次使用它们的方式。