Hi, everyone,
I have a question about the objective-C. I have the following string
NSString *data = @"abcdefghi";
but I want the data to be the "defghi"
What can I do? Can anyone help me? Thank you.
views:
30answers:
4
A:
NSString is immutable. You need to use NSMutableString unless you want to create a new string. Look at deleteCharactersInRange method.
taskinoor
2010-08-26 08:01:43
+2
A:
[data substringFromIndex:2]
this will return a new String with the characters up to the index (2) clipped.
Toastor
2010-08-26 08:03:53
this will not delete the chars from that string, rather it will create a new string. though it is sufficient for many cases :-)
taskinoor
2010-08-26 08:07:46
Also, `[data substringFromIndex:3]` is what the author wants, since the [documentation](http://developer.apple.com/mac/library/documentation/cocoa/reference/Foundation/Classes/NSString_Class/Reference/NSString.html#jumpTo_124) says that the given index is included in the result.
dreamlax
2010-08-26 08:15:27
+1
A:
You could do :
NSMutableString *data = [NSMutableString stringWithString:@"abcdefghi"];
[data deleteCharactersInRange:NSMakeRange(0, 3)];
This is using NSMutableString which allows you to delete and add Characters/Strings to itself.
The method used here is deleteCharactersInRange this deletes the letters in the NSRange, in this case the range has a location of 0, so that it starts at the start, and a length of 3, so it deletes 3 letters in.
Joshua
2010-08-26 08:15:05
+1
A:
An alternative would be NSScanner if you don't know the exact location of your chars you want to delete: Apple Guide to NSScanners. You might want to look at the rest of the guide as well, as it very good describes what you can do with a string in Obj-C.
Gauloises
2010-08-26 08:44:42