String replacement in Objective-C
You could use the method
- (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target withString:(NSString *)replacement...to get a new string with a substring replaced (See NSString documentation for others)
Example use
NSString *str = @"This is a string";str = [str stringByReplacingOccurrencesOfString:@"string" withString:@"duck"];
NSString objects are immutable (they can't be changed), but there is a mutable subclass, NSMutableString, that gives you several methods for replacing characters within a string. It's probably your best bet.
If you want multiple string replacement:
NSString *s = @"foo/bar:baz.foo";NSCharacterSet *doNotWant = [NSCharacterSet characterSetWithCharactersInString:@"/:."];s = [[s componentsSeparatedByCharactersInSet: doNotWant] componentsJoinedByString: @""];NSLog(@"%@", s); // => foobarbazfoo