Question

My code crashes at this line:

[(NSMutableString *)string replaceCharactersInRange:range withString:@""];

with the error attempt to mutate immutable object.

How is this happening and how do i fix it?

Answer 1

The string isn’t mutable, casting is not magic, it wouldn’t turn it into a mutable string. You should do it on a mutable copy:

NSMutableString* mutableString= [string mutableCopy];
[mutableString replaceCharactersInRange:range withString:@""];