How to detect UITextField cursor move without typing?

Question

When a user only moves the cursor without typing a new word (i.e. (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange) replacementString:(NSString *)string does not get triggered), how do I detect this event?

Answer 1

Add selectedTextRange property observer in viewDidAppear,

[self.txtfield addObserver:self forKeyPath:@"selectedTextRange" options:NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld  context:nil];

Then add function for this property,

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    if([keyPath isEqualToString:@"selectedTextRange"] && self.txtfield == object)
        NSLog(@"cursor moved");
}

When you move the cursor without typing any text it should print "cursor moved".