Replacing one character in a string in Objective-C

问题:

Hoping somebody can help me out - I would like to replace a certain character in a string and am wondering what is the best way to do this?

I know the location of the character, so for example, if I want to change the 3rd character in a string from A to B - how would I code that?

回答1:

If it is always the same character you can use:

stringByReplacingOccurrencesOfString:withString:

If it is the same string in the same location you can use:

stringByReplacingOccurrencesOfString:withString:options:range:

If is just a specific location you can use:

stringByReplacingCharactersInRange:withString:

Documentation here: https://developer.apple.com/documentation/foundation/nsstring

So for example:

NSString *someText = @"Goat";
NSRange range = NSMakeRange(0,1);
NSString *newText = [someText stringByReplacingCharactersInRange:range withString:@"B"];

newText would equal "Boat"

回答2:

NSString *str = @"123*abc";
str = [str stringByReplacingOccurrencesOfString:@"*" withString:@""];
//str now 123abc

回答3:

Here is the code:

[aString stringByReplacingCharactersInRange:NSMakeRange(3,1) withString:@"B"];

回答4:

Use the replaceCharactersInRange: withString: message on a NSMutableString object.