I am NSOpenPanel to select a file or folder from a user\'s machine. But when the user clicks \"open\" the cursor is at the beginning of the path that shows up in the text field
Two ideas spring to mind. First, you could use -[NSTextView setSelectedRange:]:
NSTextView * fieldEditor = [thePanel fieldEditor:NO forObject:theTextField];
NSUInteger text_len = [[fieldEditor string] length];
[fieldEditor setSelectedRange:(NSRange){text_len, 0}];
Or you could use one of the NSResponder
action methods on the text field, like moveDown:, moveToEndOfLine:, moveToEndOfParagraph:, &c. Faking a "Page Down" or "Down Arrow" keypress with [theTextField keyDown:...]
might also work.