Objective-C NSString for loop with characterAtIndex
for-loop, loops, objective-c, xcode
Solution
Characters are not object. `characterAtIndex` returns `unichar`, which is actually an integer type `unsigned short`. You need to use `%C` instead of `%@` in `NSLog`. Also character is not a `NSString`, so you can't send it `isEqualToString`. You need to use `ch == '.'` to compare `ch` against `'.'`.
unichar ch = [self.text characterAtIndex:position];
NSLog(@"%C", ch);
if (ch == '.') {} // single quotes around dot, not double quotes
Note that, `'a'` is character, `"a"` is C string and `@"a"` is NSString. They all are different types.
When you are using `%@` with unichar `ch` in `NSLog`, it is trying to print an object from memory location `ch` which is invalid. Thus you are getting a EXC_BAD_ACCESS.
Problem
I'm trying to loop through a NSString, character by character, but I'm getting a EXC_BAD_ACCESS error. Do you have an idea how to do this right? I've been googling for hours now but can't figure it out. Here is my code (.m): ``` self.textLength = [self.text length]; for (int position=0; position < self.textLength; position++) { NSLog(@"%@", [self.text characterAtIndex:position]); if ([[self.text characterAtIndex:position] isEqualToString:@"."]){ NSLog(@"it's a ."); } } ``` Thanks a lot!